CN117092443B - 10kV transformer area true type test system and true type range test method - Google Patents
10kV transformer area true type test system and true type range test method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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Abstract
The application provides a 10kV transformer station real type test system and a real type range test method, which relate to the field of power distribution integrated station detection, wherein the real type test system comprises a test power supply, a real type circuit, an integrated station, a fault simulation device and a comprehensive measurement and control protection platform; the test power supply is connected with the true circuit and is used for providing a current value and a voltage value which meet test conditions; the real circuit is connected with the integrated platform area and is used for simulating the real circuit between the test power supply and the integrated platform area; the integrated transformer area is used for simulating the operation condition of the 10kV transformer area; the fault simulation device is connected with the real circuit and the integrated transformer area and is used for performing ground fault simulation of the 10kV transformer area; the comprehensive measurement and control protection platform is connected with the true circuit, the integrated transformer area and the fault simulation device and is used for controlling the true range test of the 10kV transformer area. The method can realize true range test of the 10kV transformer station area.
Description
Technical Field
The application relates to the field of power distribution integrated transformer area detection, in particular to a 10kV transformer area true test system and a true range test method.
Background
With the great improvement of living standard, the power load of residents is greatly increased, and the power distribution network is continuously built in a reinforced way. The transformer area on the pole is used as an important node of the power distribution network, and the integration and the intelligent development are rapidly carried out. The typical design of the 10kV integrated pole-mounted transformer station area has very important significance for improving the standardization, integration and intellectualization level of the power distribution station area, meeting the development trend of complete set, integration and intellectualization of power distribution equipment, improving the engineering quality of a power distribution network, improving the working efficiency and the like.
In practice, after the transformer area is integrally designed, integrally operated and secondarily integrated, the mutual interference among devices causes frequent occurrence of faults such as misoperation, refusal operation, data distortion and the like during on-site operation, so that high-frequency faults of a distribution system such as short-circuit faults of a high-voltage port of a distribution transformer, burst short-circuit faults of a low-voltage side, long-term overload operation faults and the like are difficult to be correctly processed, and serious consequences such as abnormal operation of the devices, improper fault handling, expansion of an accident range and the like are caused.
The existing detection method for the high-integration and more intelligent 10kV integrated pole-mounted transformer area cannot follow the design thought of the pole-mounted transformer area, the detection idea of the pole-mounted transformer area still stays in the performance assessment stage of single equipment, and the coordination capacity of each equipment cannot be assessed truly and objectively. Therefore, how to design a true test system and to formulate a set of test method, and to check the coordination ability among all devices in an integrated transformer area is an important problem to be solved at present.
Disclosure of Invention
In view of the above, the application provides a 10kV transformer station real type test system and a real type range test method, which can provide a technical solution for a 10kV transformer station high-low voltage integrated real type range test.
To achieve the above object, a first aspect of the present application provides a 10kV transformer station real test system, including: the system comprises a test power supply, a true line, an integrated platform area, a fault simulation device and a comprehensive measurement and control protection platform;
the test power supply is connected with the input end of the true circuit and is used for providing a current value and a voltage value meeting test conditions for the true test system of the 10kV transformer station area;
the output end of the true circuit is connected with the integrated platform area, and the true circuit is used for realizing the simulation of the true circuit between the test power supply and the integrated platform area through the adjustment of the numerical values of the inductance, the resistance and the capacitance and the serial-parallel connection relation;
the integrated transformer area is built according to equipment and structures of a typical transformer area and is used for simulating the operation working conditions of the 10kV transformer area;
the fault simulation device is connected with the real circuit and the integrated transformer area and is used for performing ground fault simulation of the 10kV transformer area;
The comprehensive measurement and control protection platform is connected with the true circuit, the integrated transformer area and the fault simulation device and is used for controlling the true range test of the 10kV transformer area.
The second aspect of the application provides a true range test method, which comprises the following steps:
configuring an initial state for a true test system of a 10kV transformer area;
and carrying out a true range test on the 10kV transformer station by using a 10kV transformer station true range test system configured in an initial state, wherein the true range test comprises at least one of a bus short circuit test, a transformer high-voltage side short circuit test, a transformer low-voltage side short circuit test and a load abnormality test.
The application provides a 10kV transformer station real test system and a real type range test method, and provides the 10kV transformer station real test system comprising a test power supply, a real type circuit, an integrated station, a fault simulation device and a comprehensive measurement and control protection platform. The comprehensive measurement and control protection platform can be used for carrying out simulation control, measurement and protection on a test power supply, a true circuit, an integrated transformer area and a fault simulation device, so that the true range test of the 10kV transformer area is realized. The objective authenticity of the test can be ensured, and the potential safety hazards of accidents caused by misoperation, refusal, data distortion and the like in the field operation due to mutual interference among the devices can be fully solved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a primary loop of a 10kV transformer bay true test system in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit simulator according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a load simulator according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a fault simulator according to an embodiment of the present invention;
FIG. 5 is a block diagram of a measurement system in accordance with one embodiment of the present invention;
Fig. 6 shows a schematic flow chart of a true range test method according to an embodiment of the present invention.
In the figure:
1-a test power supply;
2-true circuit, 21-test protection circuit breaker, 22-test closing circuit breaker, 23-circuit simulation device, 24-10kV pole-mounted circuit breaker and 25-grounding disconnecting link;
3-integrated transformer area, 31-jet type fuse, 311-expected isolating switch, 32-lightning arrester, 33-distribution transformer, 34-comprehensive distribution box, 341-knife-fuse switch, 342-branch one-breaker, 343-branch two-breaker, 344-branch three-breaker and 35-load simulation device;
the device comprises a 4-fault simulation device, a 41-first isolating switch, a 42-second isolating switch, a 43-third isolating switch, a 410-tank body, a 420-arc lead, a 430-laser range finder, a 440-linear motion mechanism, a 450-servo motor and a 460-tank body;
5-comprehensive measurement and control protection platform, 51-control signal line, 52-measurement signal line.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
A 10kV transformer bay true test system according to some embodiments of the present invention is described below in conjunction with fig. 1-6.
The embodiment of the invention provides a 10kV transformer station real test system, as shown in fig. 1, which comprises: the system comprises a test power supply 1, a true circuit 2, an integrated platform area 3, a fault simulation device 4 and a comprehensive measurement and control protection platform 5; the test power supply 1 is connected with the input end of the real circuit 2, and the test power supply 1 is used for providing a current value and a voltage value meeting test conditions for a 10kV transformer station real test system; the output end of the real circuit 2 is connected with the integrated platform area 3, and the real circuit 2 is used for realizing real circuit simulation between the test power supply 1 and the integrated platform area 3 through adjusting the numerical values of the inductance, the resistance and the capacitance and the serial-parallel connection relation; the integrated transformer area 3 is built according to equipment and structures of a typical transformer area and is used for simulating the operation working conditions of the 10kV transformer area; the fault simulation device 4 is connected with the real circuit 2 and the integrated transformer area 3 and is used for realizing the ground fault simulation of the 10kV transformer area through the simulation of the typical ground fault of the power distribution system; the comprehensive measurement and control protection platform 5 is connected with the true line 2, the integrated transformer area 3 and the fault simulation device 4 and is used for performing simulation control, test parameter measurement and protection of a test on a true test system of the 10kV transformer area, and the true range test of the 10kV transformer area is realized.
The test power supply can comprise a test special line led out from a 220kV transformer substation, and a high-capacity test transformer with a transformation ratio of 220/11.6kV and rated short-circuit capacity of 2184MVA, wherein the low-voltage side of the high-capacity test transformer can bear the maximum short-circuit current of 63kA. In order to facilitate the power supply operation and maintenance of the 10kV transformer station real test system, the test power supply can be simultaneously provided with a grounding disconnecting switch, a lightning arrester, a circuit breaker and the like, and the specific limitation is omitted.
For this embodiment, as shown in fig. 1, the true circuit 2 may include a test protection breaker 21, a test closing breaker 22, a circuit simulator 23, a 10kV pole breaker 24, and a ground knife switch 25. The above devices are sequentially connected through an overhead insulated wire, specifically, the first end of the test protection circuit breaker 21 is used as the input end of the true circuit 2 and is connected with the test power supply 1, the second end of the test protection circuit breaker 21 is connected with the first end of the test closing circuit breaker 22, the second end of the test closing circuit breaker 22 is connected with the first end of the circuit simulation device 23, the second end of the circuit simulation device 23 is connected with the first end of the 10kV pole-mounted circuit breaker 24 and the first end of the grounding disconnecting link 25, the second end of the grounding disconnecting link 25 is grounded, and the second end of the 10kV pole-mounted circuit breaker 24 is used as the output end of the true circuit 2 and is connected with the integrated station area 3.
The test protection circuit breaker 21 plays a role in protecting in a test system, and has a rated short-circuit opening current of 63kA and a rated short-circuit closing current of 160kA; the test closing breaker 22 controls breaking in a test system, and rated short-circuit breaking current is 63kA and rated short-circuit closing current is 160kA; the line simulation device 23 can realize the equivalent simulation of the high-precision controllable medium-voltage distribution network line; the 10kV pole-mounted breaker 24 is a tested product of a bus short circuit test; the grounding switch 25 is used for supporting power outage overhaul of the test system.
In a specific application scenario, the true circuit 2 may be a circuit simulator structure for adjusting an inductance value, a capacitance value, and a resistance value in the circuit simulator structure, and an equivalent modeA longer real line between the power supply 1 to be tested and the integrated station 3. Fig. 2 is a schematic structural diagram of a circuit simulation device according to an embodiment of the present invention, in which a circuit equivalent simulation device is composed of a plurality of circuit modules, and each module simulates corresponding circuit parameters by adopting a pi model. The model structure is shown in FIG. 2, and each phase of the A/B/C three phases comprises a set of positive sequence resistors (R P ) And a set of positive sequence inductances (L P ) In series, two sets of positive-sequence capacitors (C P ) The two ends of the capacitor are connected in parallel with the two sides of the inlet and outlet line respectively, and one end of the capacitor is grounded. Wherein phase A comprises a set of positive sequence resistors (R PA ) And a set of positive sequence inductances (L PA ) In series, two sets of positive-sequence capacitors (C PA ) The two ends of the capacitor are respectively connected in parallel with the two sides of the inlet and outlet line, and one end of the capacitor is grounded; phase B comprises a set of positive sequence resistors (R PB ) And a set of positive sequence inductances (L PB ) In series, two sets of positive-sequence capacitors (C PB ) The two ends of the capacitor are respectively connected in parallel with the two sides of the inlet and outlet line, and one end of the capacitor is grounded; the C phase comprises a set of positive sequence resistors (R PC ) And a set of positive sequence inductances (L PC ) In series, two sets of positive-sequence capacitors (C PC ) The two ends of the capacitor are connected in parallel with the two sides of the inlet and outlet line respectively, and one end of the capacitor is grounded.
In a specific application scenario, the integrated transformer area 3 may be built according to the equipment and structure of a typical transformer area. The equipment of a typical transformer bay may include high voltage modules, transformer modules, low voltage distribution modules, and accessories. The high voltage module may include high voltage insulated wires, drop fuses or closed fuses, lightning arresters and high voltage cables; the transformer module can be a fully-sealed oil-immersed transformer with the energy efficiency level of the second level not lower than GB 20052-2013, the high-voltage tapping range of the fully-sealed oil-immersed transformer is +/-2 multiplied by 2.5% or 5%, and the capacity can be 50kVA, 100kVA, 200kVA and 400kVA; the comprehensive distribution box space selected by the low-voltage distribution module at least meets the installation requirements of equipment such as 1-loop incoming line, 2-loop incoming line, metering, reactive compensation (the capacity of the transformer module is 100kVA or below and is not configured), intelligent distribution transformer terminals and the like. The comprehensive distribution box adopts an insulating bus system structure, the shell is made of 304 stainless steel material, and the thickness is not less than 2mm; the accessories are parts such as a pressing plate, a hoop, a bolt and the like used for supporting, connecting and fixing. The structure of a typical transformer station area is divided into a longitudinal integrated structure and a transverse integrated design structure.
Correspondingly, the construction modes of the integrated platform area 3 can be divided into a forward installation mode and a side installation mode, and the construction of the integrated platform area 3 can be carried out by adopting the forward installation mode of a longitudinal integrated structure, but the construction is not particularly limited.
1) Vertical integrated structure normal dress:
the 10kV side is led down by an overhead insulated wire, the comprehensive distribution box is vertically fixed below the transformer module in a hanging mode and is arranged on a rack, a low-voltage prefabricated bus is adopted for wiring between the comprehensive distribution box and the rack, and the feeder is led out by an overhead insulated wire or a cable.
2) And (3) side-mounting of a longitudinal integrated structure:
the 10kV side is led down by adopting a cable, the comprehensive distribution box is vertically fixed below the transformer module in a hanging mode, the comprehensive distribution box is arranged on a rack, a low-voltage flexible bus is adopted for wiring between the comprehensive distribution box and the rack, and the feeder is led out by adopting an overhead insulated wire or a cable.
3) And (3) forward assembly of a transverse integrated structure:
the 10kV side is led down by adopting a cable, the comprehensive distribution box is fixed with the transformer module front and back, the comprehensive distribution box is installed on a rack, the transformer module is positively installed, the wiring between the comprehensive distribution box and the transformer module is in copper flexible connection, and the feeder is led out by adopting an overhead insulated wire or a cable.
4) Lateral integral structure side dress:
the 10kV side is led down by adopting a cable, the comprehensive distribution box is fixed with the transformer module front and back, the comprehensive distribution box is arranged on a rack, the transformer module is laterally arranged, the wiring between the comprehensive distribution box and the transformer module is flexibly connected by adopting copper, and the feeder is led out by adopting an overhead insulated wire or a cable.
For this embodiment, as shown in fig. 1, the integrated bay 3 may include a jet fuse 31, a desired disconnector 311, a lightning arrester 32, a distribution transformer 33, an integrated distribution box 34, and a load simulator 35. The above devices are arranged in a longitudinal integrated manner (i.e., the above longitudinal integrated structure is assembled), the distribution transformer 33 may be 10kV/400V, the 10kV side (i.e., the high voltage side) thereof may be led down by an overhead insulation wire, the integrated distribution box 34 and the low voltage side of the distribution transformer 33 may be connected by a low voltage prefabricated bus and fixed under the distribution transformer 33 in a hanging manner, and the cable is led to the load simulator 35 as a feeder. The specific connection relation can be as follows: the injection type fuse 31 and the expected isolating switch 311 are connected in parallel, the first end of the injection type fuse 31 and the first end of the expected isolating switch 311 are connected with the output end of the true circuit 2 as the input end of the integrated platform area 3, the second end of the injection type fuse 31 and the second end of the expected isolating switch 311 are connected with the first end of the lightning arrester 32, and the second end of the lightning arrester 32 is grounded; a first end (i.e., high voltage side) of the distribution transformer 33 is connected to a first end of the lightning arrester 32, a second end (i.e., low voltage side) of the distribution transformer 33 is connected to a first end of the integrated distribution box 34, and a second end of the integrated distribution box 34 is connected to the load simulator 35.
Accordingly, the integrated distribution box 34 may include a knife-fuse switch 341, a branch one-breaker 342, a branch two-breaker 343, and a branch three-breaker 344; the specific connection relation of the above devices may be: the first end of the fuse switch 341 is connected to the second end of the distribution transformer 33 as the first end of the integrated distribution box 34, the second end of the fuse switch 341 is connected to the first ends of the first branch circuit breaker 342, the second branch circuit breaker 343 and the third branch circuit breaker 344, and the second ends of the first branch circuit breaker 342, the second branch circuit breaker 343 and the third branch circuit breaker 344 are connected to the load simulator 35 as the second ends of the integrated distribution box 34.
The jet fuse 31 is a test object of a transformer high-voltage side short circuit test, a transformer low-voltage side short circuit test, a 100% low-overload breaking capacity test, a test object of a test waveform adjustment expected to be used by the disconnecting switch 311, a test object of a 80% low-overload breaking capacity test of the knife-fuse switch 341, a test object of a feeder breaking capacity test, a branch one-breaker 342, a branch two-breaker 343, and a branch three-breaker 344; the load simulation device 35 can realize high-precision controllable equivalent simulation of the power consumption load.
Fig. 3 is a schematic diagram of a load simulator according to an embodiment of the present invention, in which selected resistive, capacitive, and inductive load modules are connected in parallel to form a matrix structure, and each module is formed by interconnecting a plurality of resistive, capacitive, or inductive elements in a matrix. Each load element is connected with a bypass contactor in parallel, and when the bypass contactor is disconnected, the corresponding load element is put into operation; when the bypass contactor is closed, the two ends of the corresponding load element are short-circuited and are out of operation; the controller controls the closing or opening of the bypass contactor according to a given load loading setpoint. The operation characteristics of the real electric load can be simulated through the switching combination of load elements such as internal resistance, capacitance, inductance and the like of the device.
The resistive load element in the embodiment adopts a nichrome resistance element, and is matched with a forced high-power heat dissipation fan, so that resistance heat drift caused by resistance heating during long-time operation is avoided. The inductive load element adopts a magnetic circuit type inductor with a silicon steel sheet as an iron core and an enameled wire or glass fiber covered wire as a core, so that the active loss of the inductive load element is controlled within 5%. The capacitive load element adopts a CBB magnetic circuit type capacitor, so that the change rate of load power along with time is controlled within the precision range.
For the present embodiment, as shown in fig. 1, the 10kV transformer substation real test system may further include a first isolation switch 41, a second isolation switch 42, and a third isolation switch 43; the fault simulation device 4 is connected to the first end of the first isolating switch 41, the second isolating switch 42 and the first end of the third isolating switch 43, respectively, the second end of the first isolating switch 41 is connected to the second end of the 10kV pole-mounted circuit breaker 24, the second end of the second isolating switch 42 is connected to the first end of the distribution transformer 33, and the second end of the third isolating switch 43 is connected to the second end of the distribution transformer 33. The fault simulation device 4 can realize fault simulation of different positions through switching of the first isolating switch 41, the second isolating switch 42 and the third isolating switch 43.
Fig. 4 is a schematic structural diagram of a fault simulator 4 according to an embodiment of the present invention, where the fault simulator 4 may include a tank 410, an arc lead 420, a laser rangefinder 430, a linear motion mechanism 440, a servo motor 450, and a box 460, and the components are connected in a manner as shown in the drawing. The fault simulation device 4 can simulate a typical ground fault of the power distribution system by controlling the on-off of the first isolating switch 41, the second isolating switch 42 and the third isolating switch 43.
In the present embodiment, the fault simulation apparatus 4 has the following 3 functions:
(1) The detection platform is digitalized, is mainly used by a PC end, can realize the functions of control, simulation, data acquisition, storage and the like, is provided with an alarm reminding function, and can automatically stop after the experiment is finished to reduce the labor cost;
(2) Based on a digital platform, the operation data is visualized and developed intelligently, and the arc striking time and the distance can be controlled and tested; drawing a curve of experimental time and current through a high-precision current sampling transformer; the high-speed servo motor is used for speed regulation to achieve the multi-dimensional experimental purposes of quick reaction, variable speed adjustment and the like;
(3) The experimental mode of realizing equipment and people separation, whether test equipment or test electric energy all exist certain risk in the electric power experiment, so this test platform passes through TCP/IP communication, separates laboratory bench and operation, remote control has played the effect of safety protection.
For the present embodiment, as shown in fig. 1, the 10kV transformer substation real test system may further include a control signal line 51 and a measurement signal line 52; the comprehensive measurement and control protection platform 5 is connected into a 10kV transformer station real test system through a control signal line 51 and a measurement signal line 52 and is used for carrying out simulation control, test parameter measurement and protection on the 10kV transformer station real test system through the control signal line 51 and the measurement signal line 52, so that the real range test of the 10kV transformer station is realized. The comprehensive measurement and control protection platform 5 can be used for controlling, measuring and protecting the test power supply 1, the true circuit 2, the integrated platform area 3 and the fault simulation device 4.
Correspondingly, fig. 5 is a block diagram of a measurement system configured by the comprehensive measurement and control protection platform 5 in an embodiment of the present invention, where test data measurement directly affects the analysis of problems and the determination of quality of samples, and the signals to be measured in the test are not only large in number, but also large in amplitude range, wide in frequency range, and different in recording time. The voltage is from a few volts to tens of kilovolts, the current is from a few amperes to hundreds of amperes, the current measurement frequency is from a direct current to tens of kilohertz, and the test signal is not a single frequency but a mixed signal, the duration is from a few microseconds to tens of seconds, etc. In this embodiment, a set of high-precision measurement system is designed, and mainly includes a sensor, an integrating amplifier, an isolating amplifier, a Nicolet data acquisition system and a computer. The sensor has the function of a mutual inductor, the primary signal is kilovolt or hundred volt voltage, kiloampere or hundred ampere current, the secondary signal is several volts voltage and several amperes current, the instrument in the measuring system is a precise small-range device, and direct measurement of large current or high voltage is difficult, so that the sensor is required to convert the primary signal into the secondary signal so as to be directly utilized by the measuring system.
In a specific application scenario, the comprehensive measurement and control protection platform 5 can configure a corresponding program control interface according to actual application requirements, in this embodiment, each switch is controlled by a set of switch-on and switch-off signals, each switch-on and switch-off signal can set time (i.e. relative time of action execution), width (i.e. action duration) and angle calculation (i.e. by setting angle adjustment time), the current action state of switch-on and switch-off needs to be displayed, and the dynamic switch can be controlled manually; in the aspect of sequence control, by clicking a generating button, an action flow can be automatically generated by setting time, and flow display is performed below an interface; sequential flow preservation and history setting record calling can be performed through a preservation button and an opening button. Through the time sequence control of each switch and test article, the working conditions such as fault tripping and reclosing can be truly simulated.
The 10kV transformer station real test system provided by the embodiment can utilize the comprehensive measurement and control protection platform to perform simulation control, measurement and protection of test on a test power supply, a real circuit, an integrated station and a fault simulation device, so that the real range test of the 10kV transformer station is realized. The objective authenticity of the test can be ensured, and the potential safety hazards of accidents caused by misoperation, refusal, data distortion and the like in the field operation due to mutual interference among the devices can be fully solved.
Based on the above 10kV transformer area true test system, the true range test method provided by the invention, referring to fig. 6, can comprise the following steps:
and 110, configuring an initial state for a 10kV transformer area true test system.
The 10kV transformer area true test system can be used for carrying out true tests such as bus short-circuit tests, transformer high-voltage side short-circuit tests, transformer low-voltage side short-circuit tests, on-load abnormal tests and the like. The power bus short circuit test is a true demonstration of the switching-on and switching-off capability of a 10kV pole-mounted breaker and the extremely poor matching, wherein the extremely poor matching is that after the type selection or numerical value setting is carried out on the upper and lower protection according to an actual line, each protection device acts or does not act according to a setting principle when the line breaks down; the transformer high-voltage side short circuit test is a true demonstration of the fault breaking capacity and poor fit of the high-voltage circuit of the jet fuse, and can comprise a first breaking capacity test (such as a 100% rated breaking capacity test), a second breaking capacity test (such as a 70% breaking capacity test) and a third breaking capacity test (such as a 25% breaking capacity test), which are respectively equivalent to the manners 1, 2 and 3 of the jet fuse breaking capacity test. Wherein, the breaking test modes 1, 2 and 3 are respectively from the 3 rd part of the GB/T15166.3-2023 high voltage alternating current fuse: test mode 1, test mode 2, test mode 3 of table 5 in injection fuse 6.1; the transformer low-voltage side short circuit test is a true demonstration of the failure breaking capability and poor matching of the low-voltage line of the jet type fuse, and has the meaning equivalent to the mode 4 of the jet type fuse breaking test. Wherein, the breaking test mode 4 is from the 3 rd part of GB/T15166.3-2023 high voltage alternating current fuse: test mode 4 of table 5 in injection fuse, 6.1; the on-load anomaly test may include a first low overload break-ability test (e.g., a 100% low overload break-ability test), a second low overload break-ability test (e.g., an 80% low overload break-ability test), and a feeder break-ability test. The 100% low overload breaking capability test is a true demonstration of low overload breaking capability and poor fit for a blown fuse, and has the meaning equivalent to mode 5 of the blown fuse breaking test. Wherein, the breaking test mode 5 is from the 3 rd part of GB/T15166.3-2023 high voltage alternating current fuse: test mode 5 of table 5 in injection fuse, 6.1; the 80% low overload breaking capacity test is a true demonstration of the breaking capacity of the wire-feeding knife-fused switch of the comprehensive distribution box and the extremely poor matching; the feeder line breaking capability test is a true demonstration of the breaking capability and poor fit of the comprehensive distribution box feeder line residual current protector.
For the presently disclosed embodiments, an initial state needs to be configured for a 10kV transformer bay true test system prior to performing the eight tests described above with the 10kV transformer bay true test system. Wherein, the initial state may be: the test protection circuit breaker 21, the test closing circuit breaker 22, the expected disconnecting switch 311 are in an open state, the 10kV pole-mounted circuit breaker 24, the grounding disconnecting switch 25, the jet type fuse 31, the fuse switch 341, the branch one-circuit breaker 342, the branch two-circuit breaker 343, the branch three-circuit breaker 344, the first disconnecting switch 41, the second disconnecting switch 42 and the third disconnecting switch 43 are in a closed state, and the fault simulation device 4 is set to a continuous grounding state.
And 120, performing a true range test on the 10kV transformer station by using a 10kV transformer station true range test system in an initial configuration state, wherein the true range test comprises at least one of a bus short circuit test, a transformer high-voltage side short circuit test, a transformer low-voltage side short circuit test and a load abnormality test.
Step 120-1, for the embodiment of the present disclosure, as a possible implementation manner, when performing a bus short circuit test on a 10kV transformer station by using a 10kV transformer station true test system configured with an initial state, specific operation steps may be:
1) Starting a test, placing a tested product at a 10kV pole-mounted breaker 24, and confirming that a measurement and control signal can be received and transmitted by the comprehensive measurement and control protection platform 5;
2) The grounding disconnecting link 25, the second disconnecting switch 42 and the third disconnecting switch 43 are disconnected;
3) The line simulation device 23 is adjusted to test parameters required by the tested product;
4) The test protection circuit breaker 21 is closed, the test closing circuit breaker 22 is controlled to be opened after being closed for 0.5s, a tested product correctly breaks the loop, the duration of the power frequency recovery voltage is not less than 0.3s, the jet type fuse 31, the knife-fuse switch 341, the branch one circuit breaker 342, the branch two circuit breaker 343 and the branch three circuit breaker 344 do not act, and the condition that the above conditions are met is regarded as the test success;
5) Recording voltage and current waveforms;
6) Closing the grounding switch 25 to fully discharge the test system;
7) The breaking test protects the circuit breaker 21 and the test ends.
Accordingly, when the bus short circuit test is performed by using the 10kV transformer station real test system in the initial state, the steps of the embodiment can include: changing a real test system of a 10kV transformer area from an initial state to a first test state, and determining first test parameters corresponding to a bus short circuit test; and under the first test state and the first test parameter, controlling the real test system of the 10kV transformer station area to perform a bus short-circuit test to obtain a bus short-circuit test result. Wherein, the first test state may be: the 10kV pole-mounted circuit breaker 24 is determined as a tested product, the grounding disconnecting link 25, the second disconnecting switch 42 and the third disconnecting switch 43 are opened, and the closing test protection circuit breaker 21, the jet fuse 31, the knife-fuse switch 341, the branch one circuit breaker 342, the branch two circuit breaker 343 and the branch three circuit breaker 344 are kept in a closed state; the first test parameter may be a test parameter required when the 10kV pole-mounted circuit breaker 24 performs a bus short-circuit test; the bus short circuit test result can be correspondingly the test result of the 10kV pole-mounted circuit breaker about breaking capacity and extremely poor fit, and when the breaking capacity and the extremely poor fit are judged to be successful in the test, the bus short circuit test result can be determined to pass the test. And otherwise, determining that the bus short circuit test result is not passed.
Step 120-2, for the embodiment of the present disclosure, as a possible implementation manner, when performing a first breaking capacity test (such as a 100% rated breaking capacity test) in a transformer high-voltage side short circuit test on a 10kV transformer station by using a 10kV transformer station true test system configured in an initial state, the specific operation steps may be:
1) Starting a test, placing a tested product at the position of the injection fuse 31, and confirming that a measurement and control signal can be received and transmitted by the comprehensive measurement and control protection platform 5;
2) Closing the desired isolation switch 311;
3) The grounding disconnecting link 25, the first disconnecting switch 41 and the third disconnecting switch 43 are disconnected;
4) The line simulation device 23 is adjusted to the test parameters of the test sample breaking test mode 1;
5) Closing the test protection circuit breaker 21, controlling the test closing circuit breaker 22 to be opened after being closed for 0.5s, observing whether the voltage and current waveforms accord with expectations or not, and returning to the step 4 if the voltage and current waveforms do not accord with expectations;
6) If the waveform accords with the expectation, the expected isolating switch 311 is opened, the test closing breaker 22 is controlled to be closed for 0.5s and then the loop is opened, the tested product is correctly cut off, the power frequency recovery voltage duration time is not less than the falling time or 0.5s, the 10kV pole-mounted breaker 24, the knife-fuse switch 341, the branch one-breaker 342, the branch two-breaker 343 and the branch three-breaker 344 are not operated, and the test is considered to be successful if the conditions are met;
7) Repeating the step 6 until 6 times of tests are completed on the opening angles of 0 DEG, 90 DEG and 135 DEG of the maximum and minimum rated current fuses in the same family system of the tested product;
8) Closing the grounding switch 25 to fully discharge the test system;
9) The breaking test protects the circuit breaker 21 and the test ends.
Accordingly, in performing a first breaking capacity test using a 10kV transformer station real test system configured in an initial state, the steps of the embodiment may include: the method comprises the steps of controlling a real test system of a 10kV transformer station area to be changed from an initial state to a second test state, and determining second test parameters corresponding to a first breaking capacity test; and under the second test state and the second test parameters, controlling the 10kV transformer station real test system to repeatedly perform the first breaking capacity test until reaching the test ending condition corresponding to the first breaking capacity test, and obtaining a first breaking capacity test result. Wherein the second test state may be: determining the jet fuse 31 as a tested object, closing the expected isolating switch 311, opening the grounding disconnecting switch 25, the first isolating switch 41 and the third isolating switch 43, and keeping the closing state of the closing test protection circuit breaker 21, the 10kV pole-mounted circuit breaker 24, the knife-fuse switch 341, the branch one-circuit breaker 342, the branch two-circuit breaker 343 and the branch three-circuit breaker 344; the second test parameters are test parameters required when the jet type fuse 31 performs the breaking test mode 1; the test ending condition corresponding to the first breaking capability test may be that the injection fuse 31 corresponds to the maximum and minimum rated current fuses in the same family, and the total of 6 tests are completed with respect to the breaking angles of 0 °, 90 ° and 135 ° of the voltage of 0 °; the first breaking capacity test result may correspond to a test result of the injection fuse with respect to 100% rated breaking capacity and poor fit, and may be determined to pass the test when it is determined that the 100% rated breaking capacity and poor fit are considered to be successful. Otherwise, determining that the first breaking capacity test result is not passed.
Step 120-3, for the embodiment of the present disclosure, as a possible implementation manner, when performing a second breaking capacity test (such as a 70% breaking capacity test) in a transformer high-voltage side short circuit test on a 10kV transformer station by using a 10kV transformer station true test system configured in an initial state, the specific operation steps may be:
1) Starting a test, placing a tested product at the position of the injection fuse 31, and confirming that a measurement and control signal can be received and transmitted by the comprehensive measurement and control protection platform 5;
2) Closing the desired isolation switch 311;
3) The grounding disconnecting link 25, the first disconnecting switch 41 and the third disconnecting switch 43 are disconnected;
4) The line simulation device 23 is adjusted to the test parameters of the test sample breaking test mode 2;
5) Closing the test protection circuit breaker 21, controlling the test closing circuit breaker 22 to be opened after being closed for 0.5s, observing whether the voltage and current waveforms accord with expectations or not, and returning to the step 4 if the voltage and current waveforms do not accord with expectations;
6) If the waveform accords with the expectation, the expected isolating switch 311 is opened, the test closing breaker 22 is controlled to be closed for 0.5s and then the loop is opened, the tested product is correctly cut off, the power frequency recovery voltage duration time is not less than the falling time or 0.5s, the 10kV pole-mounted breaker 24, the knife-fuse switch 341, the branch one-breaker 342, the branch two-breaker 343 and the branch three-breaker 344 are not operated, and the test is considered to be successful if the conditions are met;
7) Repeating the step 6 until 6 times of tests are completed on the opening angles of 0 DEG, 90 DEG and 135 DEG of the maximum and minimum rated current fuses in the same family system of the tested product;
8) Closing the grounding switch 25 to fully discharge the test system;
9) The breaking test protects the circuit breaker 21 and the test ends.
Accordingly, in performing a second breaking capacity test using a 10kV transformer station real test system configured in an initial state, the steps of the embodiment may include: the method comprises the steps of controlling a real test system of a 10kV transformer station area to be changed from an initial state to a second test state, and determining a third test parameter corresponding to a second breaking capacity test; and under the second test state and the third test parameters, controlling the 10kV transformer station real test system to repeatedly perform the second breaking capacity test until reaching the test ending condition corresponding to the second breaking capacity test, and obtaining a second breaking capacity test result. Wherein the second test state may be: determining the jet fuse 31 as a tested object, closing the expected isolating switch 311, opening the grounding disconnecting switch 25, the first isolating switch 41 and the third isolating switch 43, and keeping the closing state of the closing test protection circuit breaker 21, the 10kV pole-mounted circuit breaker 24, the knife-fuse switch 341, the branch one-circuit breaker 342, the branch two-circuit breaker 343 and the branch three-circuit breaker 344; the third test parameter is a test parameter required when the jet type fuse 31 performs the breaking test mode 2; the test ending condition corresponding to the second breaking capability test may be that the maximum and minimum rated current fuses in the same family corresponding to the injection fuse 31 are tested for 6 times in total with respect to the breaking angles of 0 °, 90 ° and 135 ° of the voltage of 0 °; the second breaking capacity test result may correspond to a test result of the injection fuse with respect to the 70% breaking capacity test and the poor fit, and may be determined to pass the test when the 70% breaking capacity test and the poor fit are judged to be successful. And otherwise, determining that the second breaking capacity test result is failed.
Step 120-4, for the embodiment of the present disclosure, as a possible implementation manner, when performing a third breaking capacity test (such as a 25% breaking capacity test) in a transformer high-voltage side short circuit test on a 10kV transformer station by using a 10kV transformer station true test system configured in an initial state, the specific operation steps may be:
1) Starting a test, placing a tested product at the position of the injection fuse 31, and confirming that a measurement and control signal can be received and transmitted by the comprehensive measurement and control protection platform 5;
2) Closing the desired isolation switch 311;
3) The grounding disconnecting link 25, the first disconnecting switch 41 and the third disconnecting switch 43 are disconnected;
4) The line simulation device 23 is adjusted to the test parameters of the test sample breaking test mode 3;
5) Closing the test protection circuit breaker 21, controlling the test closing circuit breaker 22 to be opened after being closed for 0.5s, observing whether the voltage and current waveforms accord with expectations or not, and returning to the step 4 if the voltage and current waveforms do not accord with expectations;
6) If the waveform accords with the expectation, the expected isolating switch 311 is opened, the test closing breaker 22 is controlled to be closed for 0.5s and then the loop is opened, the tested product is correctly cut off, the power frequency recovery voltage duration time is not less than the falling time or 0.5s, the 10kV pole-mounted breaker 24, the knife-fuse switch 341, the branch one-breaker 342, the branch two-breaker 343 and the branch three-breaker 344 are not operated, and the test is considered to be successful if the conditions are met;
7) Repeating the step 6 until 2 times of tests are completed on the 90-degree breaking angle of the maximum rated current fuse and the minimum rated current fuse in the same family of the tested product relative to the voltage of 0 degree;
8) Closing the grounding switch 25 to fully discharge the test system;
9) The breaking test protects the circuit breaker 21 and the test ends.
Accordingly, in performing a third breaking capacity test using a 10kV transformer station real test system configured in an initial state, the steps of the embodiment may include: the method comprises the steps of controlling a real test system of a 10kV transformer station area to be changed from an initial state to a second test state, and determining fourth test parameters corresponding to a third breaking capacity test; and under the second test state and the fourth test parameter, controlling the 10kV transformer station real test system to repeatedly perform the third breaking capacity test until the test ending condition corresponding to the third breaking capacity test is reached, and obtaining a third breaking capacity test result. Wherein the second test state may be: determining the jet fuse 31 as a tested object, closing the expected isolating switch 311, opening the grounding disconnecting switch 25, the first isolating switch 41 and the third isolating switch 43, and keeping the closing state of the closing test protection circuit breaker 21, the 10kV pole-mounted circuit breaker 24, the knife-fuse switch 341, the branch one-circuit breaker 342, the branch two-circuit breaker 343 and the branch three-circuit breaker 344; the third test parameter is a test parameter required when the jet fuse 31 performs the breaking test mode 3; the test ending condition corresponding to the third breaking capability test may be that 2 tests are completed for 90 ° breaking angles of the maximum and minimum rated current fuses in the same family of the jet fuses 31 with respect to the voltage 0 °; the third breaking capacity test result may correspond to a test result of the injection fuse with respect to the 25% breaking capacity test and the poor fit, and may be determined to pass the test when the 25% breaking capacity test and the poor fit are judged to be successful. Otherwise, determining that the third breaking capacity test result is not passed.
Step 120-5, for the embodiment of the present disclosure, as a possible implementation manner, when performing a transformer low-voltage side short-circuit test on a 10kV transformer station by using a 10kV transformer station true test system configured in an initial state, the specific operation steps may be:
1) Starting a test, placing a tested product at the position of the injection fuse 31, and confirming that a measurement and control signal can be received and transmitted by the comprehensive measurement and control protection platform 5;
2) Closing the desired isolation switch 311;
3) The earthing knife-switch 25, the first isolating switch 41 and the second isolating switch 42 are opened;
4) The line simulation device 23 is adjusted to the test parameters of the test sample breaking test mode 4;
5) Closing the test protection circuit breaker 21, controlling the test closing circuit breaker 22 to be opened after being closed for 0.5s, observing whether the voltage and current waveforms accord with expectations or not, and returning to the step 4 if the voltage and current waveforms do not accord with expectations;
6) If the waveform accords with the expectation, the expected isolating switch 311 is opened, the test closing breaker 22 is controlled to be closed for 0.5s and then the loop is opened, the tested product is correctly cut off, the power frequency recovery voltage duration time is not less than the falling time or 0.5s, the 10kV pole-mounted breaker 24, the knife-fuse switch 341, the branch one-breaker 342, the branch two-breaker 343 and the branch three-breaker 344 are not operated, and the test is considered to be successful if the conditions are met;
7) Repeating the step 6 until the random breaking angle of the fuse wire with the minimum rated current in the same family of the tested product is tested for 2 times;
8) Closing the grounding switch 25 to fully discharge the test system;
9) The breaking test protects the circuit breaker 21 and the test ends.
Accordingly, when the transformer low-voltage side short circuit test is performed by using the 10kV transformer area true test system configured in the initial state, the steps of the embodiment can include: changing a real test system of a 10kV transformer area from an initial state to a third test state, and determining fifth test parameters corresponding to a short circuit test of a low-voltage side of the transformer; and under the third test state and the fifth test parameter, controlling the real test system of the 10kV transformer area to repeatedly perform the short circuit test of the low voltage side of the transformer until the test ending condition corresponding to the short circuit test of the low voltage side of the transformer is reached, and obtaining the short circuit test result of the low voltage side of the transformer. Wherein, the third test state may be: determining the jet fuse 31 as a tested object, closing the expected isolating switch 311, opening the grounding disconnecting switch 25, the first isolating switch 41 and the third isolating switch 43, and keeping the closing state of the closing test protection circuit breaker 21, the 10kV pole-mounted circuit breaker 24, the knife-fuse switch 341, the branch one-circuit breaker 342, the branch two-circuit breaker 343 and the branch three-circuit breaker 344; the fifth test parameter is a test parameter required when the injection fuse 31 performs test mode 4; the test ending condition corresponding to the short circuit test of the low voltage side of the transformer can be that the random opening and breaking angles of the minimum rated current fuses in the same family of the jet fuses 31 are completed in 2 times; the low-voltage side short circuit test result of the transformer can be correspondingly the test result of the jet type fuse about the fault breaking capacity and the poor fit of the low-voltage line, and when the fault breaking capacity and the poor fit of the low-voltage line are judged to be successful in test, the low-voltage side short circuit test result of the transformer can be determined to pass the test. And otherwise, determining that the short circuit test result of the low-voltage side of the transformer is failed.
Step 120-6, for the embodiment of the present disclosure, as a possible implementation manner, when performing a first low overload breaking capability test (such as a 100% low overload breaking capability test) in a load abnormality test on a 10kV transformer station by using a 10kV transformer station true test system configured in an initial state, specific operation steps may be:
1) Starting a test, placing a tested product at the position of the injection fuse 31, and confirming that a measurement and control signal can be received and transmitted by the comprehensive measurement and control protection platform 5;
2) Closing the desired isolation switch 311;
3) The grounding disconnecting link 25, the first disconnecting switch 41, the second disconnecting switch 42 and the third disconnecting switch 43 are disconnected;
4) The line simulation device 23 and the load simulation device 35 are adjusted to test parameters of a test sample breaking test mode 5;
5) Closing the test protection circuit breaker 21, controlling the test closing circuit breaker 22 to be opened after being closed for 0.5s, observing whether the voltage and current waveforms accord with expectations or not, and returning to the step 4 if the voltage and current waveforms do not accord with expectations;
6) If the waveform accords with the expectation, the expected isolating switch 311 is opened, the test closing breaker 22 is controlled to be closed for 10 seconds and then is opened, the tested product is correctly cut off, the power frequency recovery voltage duration time is not less than the falling time or 0.5 seconds, the 10kV pole-mounted breaker 24, the knife-fuse switch 341, the branch one-breaker 342, the branch two-breaker 343 and the branch three-breaker 344 are all not operated, and the test is considered to be successful if the conditions are met;
7) Repeating the step 6 until 2 times of tests are completed on the random breaking angle of the minimum rated current fuse in the same family of the tested product, wherein the random breaking angle is 0 DEG relative to the voltage;
8) Closing the grounding disconnecting link 25 and the third isolating switch 43 to fully discharge the test system;
9) The breaking test protects the circuit breaker 21 and the test ends.
Accordingly, in performing a first low overload breaking capability test using a 10kV transformer bay real test system configured in an initial state, the steps of an embodiment may include: and controlling the 10kV transformer station real test system to change from an initial state to a fourth test state, determining a sixth test parameter corresponding to the first low overload breaking capacity test, and controlling the 10kV transformer station real test system to repeatedly perform the first low overload breaking capacity test under the fourth test state and the sixth test parameter until reaching a test ending condition corresponding to the first low overload breaking capacity test, thereby obtaining a first low overload breaking capacity test result. Wherein, the fourth test state may be: determining the jet fuse 31 as a tested object, and closing the expected isolating switch 311; the grounding disconnecting link 25, the first disconnecting switch 41, the second disconnecting switch 42 and the third disconnecting switch 43 are disconnected; the closing test protection circuit breaker 21, the 10kV pole-mounted circuit breaker 24, the knife-fuse switch 341, the branch one circuit breaker 342, the branch two circuit breaker 343 and the branch three circuit breaker 344 are kept in a closed state; the sixth test parameter is a test parameter required when the injection fuse 31 performs test mode 5; the test ending condition corresponding to the first low overload breaking capacity test can be that 2 times of tests are completed in total of random breaking angles of the minimum rated current fuses in the same family relative to the voltage of 0 degrees; the first low overload breaking capacity test result may correspond to a test result of the injection fuse with respect to the low overload breaking capacity and the poor fit, and the first low overload breaking capacity test result may be determined to pass the test when the low overload breaking capacity and the poor fit are determined to be successful. And otherwise, determining that the first low overload breaking capacity test result is failed.
Step 120-7, for the embodiment of the present disclosure, as a possible implementation manner, when performing a second low overload breaking capability test (such as an 80% low overload breaking capability test) in a load abnormality test on a 10kV transformer station by using a 10kV transformer station true test system configured in an initial state, the specific operation steps may be:
1) Starting a test, placing a tested object at a knife-fuse switch 341, and confirming that a measurement and control signal can be received and transmitted by the comprehensive measurement and control protection platform 5;
2) The grounding disconnecting link 25, the first disconnecting switch 41, the second disconnecting switch 42 and the third disconnecting switch 43 are disconnected;
3) The test parameters of the line simulation device 23 and the load simulation device 35 are adjusted to carry out overload simulation, so that the overload current is 80% of the test current of the mode 5 of the jet fuse 31;
4) The test closing breaker 22 is controlled to be opened after being closed for 10 seconds, a tested product is correctly cut off, the duration of the power frequency recovery voltage is not less than the falling time or 0.5 seconds, the 10kV pole-mounted breaker 24, the jet type fuse 31, the branch one breaker 342, the branch two breaker 343 and the branch three breaker 344 do not act, and the test is considered to be successful if the conditions are met;
5) Closing the grounding disconnecting link 25 and the third isolating switch 43 to fully discharge the test system;
6) The breaking test protects the circuit breaker 21 and the test ends.
Accordingly, in performing a second low overload breaking capability test using a 10kV transformer bay real test system configured in an initial state, the steps of an embodiment may include: and controlling the 10kV transformer station real test system to change from an initial state to a fifth test state, determining a seventh test parameter corresponding to the second low overload breaking capacity test, and controlling the 10kV transformer station real test system to repeatedly perform the second low overload breaking capacity test under the fifth test state and the seventh test parameter to obtain a second low overload breaking capacity test result. Wherein the fifth test state may be: determining a fuse switch 341 as a tested object, and opening a grounding switch 25, a first isolating switch 41, a second isolating switch 42 and a third isolating switch 43, wherein the 10kV pole-mounted circuit breaker 24, the jet fuse 31, the branch one circuit breaker 342, the branch two circuit breaker 343 and the branch three circuit breaker 344 are kept in a closed state; the seventh test parameter is that the overload current is 80% of the test current of the mode 5 of the jet fuse 31; the second low overload breaking capacity test result can correspond to the breaking capacity of the comprehensive distribution box incoming line knife-fuse switch and the test result matched with the limit, and when judging that the breaking capacity of the comprehensive distribution box incoming line knife-fuse switch and the limit matched with the limit are regarded as successful tests, the second low overload breaking capacity test result can be determined to pass the tests. And otherwise, determining that the second low overload breaking capacity test result is failed.
Step 120-8, for the embodiment of the present disclosure, as a possible implementation manner, when performing a feeder line breaking capability test in a load abnormality test on a 10kV transformer station by using a 10kV transformer station true test system configured in an initial state, specific operation steps may be:
1) Starting the test, placing the tested object at the first branch circuit breaker 342, the second branch circuit breaker 343 and the third branch circuit breaker 344, and confirming that the measurement and control signals can be received and transmitted by the comprehensive measurement and control protection platform 5;
2) The grounding disconnecting link 25, the first disconnecting switch 41, the second disconnecting switch 42 and the third disconnecting switch 43 are disconnected;
3) The overload simulation is carried out by adjusting the test parameters of the line simulation device 23 and the load simulation device 35, so that the overload current at one random position of the branch one breaker 342, the branch two breaker 343 and the branch three breaker 344 is 60 percent of the test current of the mode 5 of the jet fuse 31, and the current at the other two positions is adjusted to 80 percent of the current;
4) The test closing breaker 22 is controlled to be opened after being closed for 10 seconds, a loop where overload current is located is correctly cut off by a tested product, the voltage duration time after the opening is not less than 15 seconds, and the on-column breaker 24, the jet type fuse 31 and the rest two branch breakers do not act;
5) Repeating the step 5 until the test of 3 branches is completed for 3 times;
6) Closing the grounding switch 24 and the third isolating switch 43 to fully discharge the test system;
7) The breaking test protects the circuit breaker 21 and the test ends.
Accordingly, when the feeder line breaking capability test is performed by using the 10kV transformer station real test system in the initial state, the embodiment steps may include: and controlling the 10kV transformer station real test system to change from an initial state to a sixth test state, determining an eighth test parameter corresponding to the feeder line breaking capacity test, and controlling the 10kV transformer station real test system to repeatedly perform the feeder line breaking capacity test under the sixth test state and the eighth test parameter until reaching a test ending condition corresponding to the feeder line breaking capacity test, thereby obtaining a feeder line breaking capacity test result. Wherein, the sixth test state may be: the branch one-breaker 342, the branch two-breaker 343 and the branch three-breaker 344 are determined as the tested products, and the grounding disconnecting link 25, the first disconnecting switch 41, the second disconnecting switch 42 and the third disconnecting switch 43 are opened, and the 10kV pole-mounted breaker 24, the jet type fuse 31 and the knife-fuse switch 341 are kept in the closed state; the eighth test parameter is that the overload current at one random position of the branch one breaker 342, the branch two breaker 343 and the branch three breaker 344 is 60% of the test current of the mode 5 of the jet fuse 31, and the current at the other two positions is adjusted to 80% of the current; the corresponding test ending condition of the feeder line breaking capacity test is that 3 branches are tested for 3 times; the test result of the feeder line breaking capacity can correspond to the test result of the breaking capacity and the poor fit of the comprehensive distribution box feeder line residual current protector, and when the breaking capacity and the poor fit of the comprehensive distribution box feeder line residual current protector are judged to be considered as successful tests, the test result of the feeder line breaking capacity can be determined to pass the tests. And otherwise, determining that the feeder line breaking capacity test result is not passed.
The embodiment of the invention has the following beneficial effects:
the 10kV transformer station real test system and the corresponding test flow and method provided by the invention have the capability of carrying out high-low voltage integrated real range test on the 10kV transformer station. The test carried out on the basis of the invention can carry out test verification on the high-low voltage protection coordination capacity of the 10kV transformer station area. The specific test embodiment proves that the method has the remarkable advantages of safety, reliability, parameter controllability and the like, and potential safety hazards which possibly cause accidents such as misoperation, refusal of operation, data distortion and the like during on-site operation caused by mutual interference among equipment can be fully solved.
While the present invention has been described with reference to the exemplary embodiments, it should be understood that the present invention is not limited to the above-described exemplary embodiments. It will be apparent to those skilled in the art that the above-described exemplary embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (8)
1. A 10kV transformer bay true test system, comprising: the system comprises a test power supply, a true line, an integrated platform area, a fault simulation device and a comprehensive measurement and control protection platform;
The test power supply is connected with the input end of the true circuit and is used for providing a current value and a voltage value meeting test conditions for the 10kV transformer station region true test system;
the output end of the true circuit is connected with the integrated platform area, and the true circuit is used for realizing the simulation of the true circuit between the test power supply and the integrated platform area through the adjustment of the numerical value and the serial-parallel connection relation of the inductance, the resistance and the capacitance;
the integrated transformer area is built according to equipment and structures of a typical transformer area and is used for simulating the operation working conditions of the 10kV transformer area;
the fault simulation device is connected with the true line and the integrated transformer area and is used for performing ground fault simulation of the 10kV transformer area;
the comprehensive measurement and control protection platform is connected with the true line, the integrated transformer area and the fault simulation device and is used for controlling the true range test of the 10kV transformer area;
the integrated platform area comprises an injection fuse, an expected isolating switch, a lightning arrester, a distribution transformer, a comprehensive distribution box and a load simulation device, wherein the injection fuse and the expected isolating switch are connected in parallel, a first end of the injection fuse and a first end of the expected isolating switch are used as input ends of the integrated platform area and are connected with an output end of the real circuit, a second end of the injection fuse and a second end of the expected isolating switch are connected with a first end of the lightning arrester, and a second end of the lightning arrester is grounded; the first end of the distribution transformer is connected with the first end of the lightning arrester, the second end of the distribution transformer is connected with the first end of the comprehensive distribution box, and the second end of the comprehensive distribution box is connected with the load simulation device;
The comprehensive distribution box comprises a knife-fuse switch, a branch one-breaker, a branch two-breaker and a branch three-breaker; the first end of the knife-melt switch is used as the first end of the comprehensive distribution box and is connected with the second end of the distribution transformer, the second end of the knife-melt switch is respectively connected with the first ends of the branch one-breaker, the branch two-breaker and the branch three-breaker, and the second ends of the branch one-breaker, the branch two-breaker and the branch three-breaker are used as the second ends of the comprehensive distribution box and are connected with the load simulation device;
the 10kV transformer district true test system still includes: the first isolating switch, the second isolating switch and the third isolating switch; the fault simulation device is respectively connected with the first isolating switch, the second isolating switch and the first end of the third isolating switch, the second end of the first isolating switch is connected with the second end of the 10kV pole-mounted circuit breaker, the second end of the second isolating switch is connected with the first end of the distribution transformer, and the second end of the third isolating switch is connected with the second end of the distribution transformer.
2. The 10kV transformer bay true test system of claim 1, wherein the true circuit comprises: the circuit breaker comprises a test protection circuit breaker, a test closing circuit breaker, a circuit simulation device, a 10kV pole-mounted circuit breaker and a grounding disconnecting link;
the first end of the test protection circuit breaker is used as the input end of the true circuit and is connected with the test power supply, the second end of the test protection circuit breaker is connected with the first end of the test closing circuit breaker, the second end of the test closing circuit breaker is connected with the first end of the circuit simulation device, the second end of the circuit simulation device is connected with the first end of the 10kV pole-mounted circuit breaker and the first end of the grounding disconnecting link, the second end of the grounding disconnecting link is grounded, and the second end of the 10kV pole-mounted circuit breaker is used as the output end of the true circuit and is connected with the integrated bench area.
3. The 10kV transformer bay true test system of claim 1, wherein the test system further comprises a control signal line, a measurement signal line;
the comprehensive measurement and control protection platform is connected into the 10kV transformer station area true test system through the control signal line and the measurement signal line and is used for controlling and carrying out the 10kV transformer station area true range test.
4. A true range test method, the method comprising:
configuring an initial state for the 10kV transformer station real test system by adopting the 10kV transformer station real test system according to claim 1;
and carrying out a true range test on the 10kV transformer station by using a 10kV transformer station true range test system configured in the initial state, wherein the true range test comprises at least one of a bus short circuit test, a transformer high-voltage side short circuit test, a transformer low-voltage side short circuit test and a load abnormality test.
5. The true range test method according to claim 4, wherein, in the case where the true range test includes the bus short circuit test, the true range test is performed on the 10kV transformer bay using the 10kV transformer bay true test system configured with the initial state, comprising:
the method comprises the steps of controlling the real test system of the 10kV transformer station area to be changed from the initial state to a first test state, and determining first test parameters corresponding to the bus short-circuit test;
and under the first test state and the first test parameter, controlling the 10kV transformer station area true test system to perform the bus short-circuit test to obtain a bus short-circuit test result.
6. The true range test method of claim 4, wherein the transformer high-voltage side short circuit test includes a first break-ability test, a second break-ability test, and a third break-ability test, and wherein in the case where the true range test includes the transformer high-voltage side short circuit test, the performing the true range test on the 10kV transformer bay using the 10kV transformer bay true test system configured with the initial state includes:
the 10kV transformer area true test system is controlled to be changed from the initial state to a second test state, and a second test parameter corresponding to the first breaking capacity test, a third test parameter corresponding to the second breaking capacity test and a fourth test parameter corresponding to the third breaking capacity test are determined;
under the second test state and the second test parameters, controlling the 10kV transformer station real test system to repeatedly perform the first breaking capacity test until reaching the test ending condition corresponding to the first breaking capacity test, and obtaining a first breaking capacity test result; the method comprises the steps of,
under the second test state and the third test parameters, controlling the 10kV transformer station real test system to repeatedly perform the second breaking capacity test until reaching the test ending condition corresponding to the second breaking capacity test, and obtaining a second breaking capacity test result; the method comprises the steps of,
And under the second test state and the fourth test parameter, controlling the 10kV transformer station real test system to repeatedly perform the third breaking capacity test until reaching the test ending condition corresponding to the third breaking capacity test, and obtaining a third breaking capacity test result.
7. The true range test method according to claim 4, wherein, in the case where the true range test includes the transformer low-voltage side short circuit test, the performing the true range test on the 10kV transformer bay using the 10kV transformer bay true test system configured with the initial state includes:
the 10kV transformer station area true test system is controlled to be changed from the initial state to a third test state, and fifth test parameters corresponding to the transformer low-voltage side short circuit test are determined;
and under the third test state and the fifth test parameter, controlling the 10kV transformer station real test system to repeatedly perform the transformer low-voltage side short circuit test until the test ending condition corresponding to the transformer low-voltage side short circuit test is reached, and obtaining a transformer low-voltage side short circuit test result.
8. The true range test method of claim 4, wherein the on-load anomaly test includes a first low overload breaking capability test, a second low overload breaking capability test, and a feeder breaking capability test, and wherein, in a case where the true range test includes the on-load anomaly test, the performing the true range test on the 10kV transformer bay using the 10kV transformer bay true test system configured with the initial state includes:
Controlling the 10kV transformer station real test system to change from the initial state to a fourth test state, determining a sixth test parameter corresponding to the first low overload breaking capacity test, and controlling the 10kV transformer station real test system to repeatedly perform the first low overload breaking capacity test under the fourth test state and the sixth test parameter until reaching a test ending condition corresponding to the first low overload breaking capacity test to obtain a first low overload breaking capacity test result; the method comprises the steps of,
controlling the 10kV transformer station real test system to change from the initial state to a fifth test state, determining a seventh test parameter corresponding to the second low overload breaking capacity test, and controlling the 10kV transformer station real test system to repeatedly perform the second low overload breaking capacity test under the fifth test state and the seventh test parameter to obtain a second low overload breaking capacity test result; the method comprises the steps of,
and controlling the 10kV transformer station real test system to change from the initial state to a sixth test state, determining an eighth test parameter corresponding to the feeder line breaking capacity test, and controlling the 10kV transformer station real test system to repeatedly perform the feeder line breaking capacity test under the sixth test state and the eighth test parameter until reaching a test ending condition corresponding to the feeder line breaking capacity test, thereby obtaining a feeder line breaking capacity test result.
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