CN214227819U - Generator-transformer group protection device and generator-transformer group protection equipment - Google Patents
Generator-transformer group protection device and generator-transformer group protection equipment Download PDFInfo
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- CN214227819U CN214227819U CN202023057200.0U CN202023057200U CN214227819U CN 214227819 U CN214227819 U CN 214227819U CN 202023057200 U CN202023057200 U CN 202023057200U CN 214227819 U CN214227819 U CN 214227819U
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Abstract
The application discloses send out and become group protection device and send out and become group protection equipment relates to and send out and become group relay protection technical field to solve the technical problem who sends out and becomes group fracture flashover, send out and become group protection device and include: the circuit breaker comprises a circuit breaker position detection module, a current detection module, a logic control module, a time delay module and an action outlet module; the logic control module is provided with a first end, a second end and a third end, the first end of the logic control module is connected with the circuit breaker position detection module, the second end of the logic control module is connected with the current detection module, and the third end of the logic control module is connected with the time delay module; the delay module is provided with a first end and a second end, the first end of the delay module is connected with the logic control module, and the second end of the delay module is connected with the action outlet module. The application is used for the flashover protection of the fracture of the generator-transformer set.
Description
Technical Field
The application relates to the technical field of relay protection of generator transformer sets, in particular to a generator transformer set protection device and generator transformer set protection equipment.
Background
In a thermal power plant, a generator-transformer unit protection device is an important component of a power system, can be used for reflecting faults and abnormal working states of electrical equipment such as a generator-transformer unit and the like, and automatically, quickly and selectively acts on a breaker on the high-voltage side of a transformer to cut off the faulty electrical equipment from the power system, so that the safe and stable operation of the power system is ensured.
In the generation and transformation group grid connection process, the voltage acting on the breaker fracture of the high-voltage side of the transformer continuously changes along with the change of the phase angle difference between the motor to be connected and the equivalent potential of the power system, when the voltage directions of the two sides of the breaker of the high-voltage side of the transformer are 180 degrees and the voltage of the motor to be connected rises to the rated voltage, the voltage value of the breaker fracture reaches the maximum value, and is double phase voltage, so that the breaker fracture flashover accident is easily caused.
In the related art, the G60 and T35 series generator-transformer protection devices produced by GE general electric company in the united states do not have a breaker break flashover protection function, and when a breaker break on the high-voltage side of a step-up transformer is subjected to flashover, faulty electrical equipment cannot be quickly, sensitively, reliably and selectively cut off, so that an accident is expanded, the safety of a generator is threatened, and the stable operation of a power system is damaged.
SUMMERY OF THE UTILITY MODEL
In a first aspect, an embodiment of the present application provides a protection device for a generator-transformer set, including: the circuit breaker comprises a circuit breaker position detection module, a current detection module, a logic control module, a time delay module and an action outlet module; the logic control module is provided with a first end, a second end and a third end, the first end of the logic control module is connected with the circuit breaker position detection module, the second end of the logic control module is connected with the current detection module, and the third end of the logic control module is connected with the time delay module; the delay module is provided with a first end and a second end, the first end of the delay module is connected with the logic control module, and the second end of the delay module is connected with the action outlet module.
In a second aspect, an embodiment of the present application provides a protection device for a generator-transformer set, including: a hair-change group and a hair-change group protection device as described in the first aspect; the generator-transformer group comprises a generator, a transformer and a breaker; the transformer is a step-up transformer and is provided with a first end and a second end, the first end of the transformer is connected with the generator, and the second end of the transformer is connected with the circuit breaker; the circuit breaker position detection module and the current detection module are respectively connected with the circuit breaker, and the action outlet module is connected with the generator.
The embodiment of the application can achieve the following beneficial effects: it is in the branch floodgate position to send out becomes group protection device through detecting the circuit breaker at circuit breaker position detection module, and under the current value that current detection module detected the circuit breaker was greater than the condition of circuit breaker flashover protection definite value, logic control module output high level signal to delay module, delay module is in after high level signal continuous output's time reaches the time value of predetermineeing, will high level signal output to action export module, action export module triggers flashover protection action signal based on the high level signal who receives, will flashover protection action signal output sends out to and becomes the group to for sending out becomes the group and provide flashover protection, realized sending the fracture flashover protection function who becomes the group.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural block diagram of a generator-transformer set protection device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural block diagram of a generator-transformer set protection device according to an embodiment of the present application;
fig. 3 is a schematic structural block diagram of a generator-transformer group protection device according to an embodiment of the present application;
fig. 4 is one of schematic secondary control circuit wiring diagrams of a generator-transformer unit protection device according to an embodiment of the present disclosure;
fig. 5 is one of schematic secondary control circuit wiring diagrams of a generator-transformer unit protection device according to an embodiment of the present disclosure;
reference numerals:
10-a first air switch; 20-a generator set protection device; 31 — first position auxiliary contacts; 32-second position auxiliary contacts; 40-a second air switch; DC 110V-DC power supply with output of 110V rated voltage; 1DLA — first normally closed contact; 1DLB — second normally closed contact; DLC — third normally closed contact; 2DLA — fourth normally closed contact; 2DLB — fifth normally closed contact; DLC — sixth normally closed contact; 1 BJ-third junction; 2BJ — fourth junction; 1LP — first hard platen; 2 LP-second hard platen.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a mechanical or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The generator-transformer group is a unit type power generation system, the generator-transformer group can be composed of a generator, a transformer, a circuit breaker and other electrical equipment, the transformer can be a step-up transformer, the generator is connected with a low-voltage side coil of the step-up transformer through a cable, a high-voltage side coil of the step-up transformer is connected with a bus through the circuit breaker, and the generator-transformer group is convenient to be connected with a power grid through the bus. In the process of generating and transforming the grid connection, the transformer is connected with the bus through the breaker, the breaker is located at a breaking position, at the moment, a distance exists between a moving contact and a static contact in a vacuum arc extinguish chamber of the breaker, electric arcs can be generated, and the fracture flashover accident of the breaker can occur.
In the related art, a hair change group protection device may be used to protect a hair change group. The generator-transformer group protection devices of G60 and T35 series (hereinafter referred to as GE generator-transformer group protection devices) manufactured by GE corporation of usa may include a power module, an acquisition module, and an output module; the power supply module is used for supplying power to enable the GE generator set protection device to normally and stably operate; the acquisition module is connected with the generator-transformer set and is used for acquiring parameter values such as voltage values, current values and the like of the generator-transformer set and acquiring states of partial switching values in the generator-transformer set, such as the opening state and the closing state of an auxiliary contact of a circuit breaker; the output module is connected with the generator-transformer set and can output various protection action signals for protecting the generator-transformer set based on the acquired generator-transformer set parameter values, such as short circuit protection action signals, overcurrent protection action signals, overvoltage protection action signals and the like. However, the GE group protection device does not have a fracture flashover protection function, and because the GE group protection device belongs to an import device, the fracture flashover protection function cannot be realized by software development and version upgrade methods. Based on this, the utility model discloses a send GE to become backup function module of group protection device and reconfigure, build, associate to realize its fracture flashover protect function.
The hair-change group protection device provided by the embodiment of the application is described below with reference to fig. 1-2.
In a first aspect, an embodiment of the present application provides a hair-transformer set protection device, as shown in fig. 1, the hair-transformer set protection device may include:
the circuit breaker comprises a circuit breaker position detection module, a current detection module, a logic control module, a time delay module and an action outlet module;
the logic control module is provided with a first end, a second end and a third end, the first end of the logic control module is connected with the circuit breaker position detection module, the second end of the logic control module is connected with the current detection module, and the third end of the logic control module is connected with the time delay module;
the delay module is provided with a first end and a second end, the first end of the delay module is connected with the logic control module, and the second end of the delay module is connected with the action outlet module.
In this embodiment of the application, the circuit breaker position detection module may be an acquisition module in the GE generator transformer group protection device, the acquisition module may acquire the closed/open state of some switching values in the generator transformer group, and the switching values may be position auxiliary contacts of the circuit breaker.
For example, the circuit breaker position detection module may be a first relay, the first relay may include a first contact and a first control coil, the first control coil and the first contact are separated from each other and used for controlling the first contact, and the first control coil may be connected with a position auxiliary contact of a circuit breaker. Thus, when the circuit breaker is in the opening position, the position auxiliary contact of the circuit breaker is closed, so that the first control coil is electrified and excited; the first control coil controls the first contact to be closed in the electrified state; when the first contact is in a closed state, the first relay can output a high-level signal. That is, the first relay may output a high level signal when detecting that the circuit breaker is in the open position.
In the embodiment of the present application, the current detection module may be a flexible element in the GE shift group protection device. The flexible element is an inactive standby module in the GE group transmission protection device, can be used for judging the magnitude of an input current value or voltage value, and outputs a high-level signal based on the magnitude of the input current value or voltage value.
For example, the current detection module may be a comparator having a first input terminal, a second input terminal, and an output terminal. The first input end of the comparator obtains a current value to be detected, the second input end of the comparator can obtain a preset fixed current value, and the output end of the comparator can output a high-level signal under the condition that the current value to be detected is larger than the preset fixed current value.
It can be understood that, in the embodiment of the present application, the preset fixed current value received by the second input terminal of the comparator may be a circuit breaker flashover protection fixed value. Generally speaking, if the current detection module outputs a high level signal, it indicates that the current value to be detected is greater than the flashover protection fixed value of the circuit breaker, and the high level signal can be output, so as to provide flashover protection action for the generator-transformer set.
The circuit breaker flashover protection fixed value can be preset according to the breaker fracture flashover condition in the actual grid connection condition of the generator-transformer unit.
In the embodiment of the application, the logic control module can be an and logic gate control element which is reserved in the GE shift group protection device. The and logic gate control element has a first input, a second input, and an output. The output of the and logic gate control element may output a high signal if its first input receives a high signal and its second input receives a high signal.
In this embodiment of the application, the delay module may be a timer for standby in a GE transmission and transformation group protection device, the timer has a delay function, the timer has a first end and a second end, and the timer may delay a high level signal received by the first end by a preset time value and then output the high level signal by the second end.
In this embodiment of the application, the action exit module is connected to the second end of the delay module, and the action exit module may be an output module in the GE transmission and transformation group protection device, and may trigger and output a flashover protection action signal when receiving a high level signal output by the delay module. For example, the motion exit module may be a second relay, and the second relay may include a second contact and a second control coil, the second control coil and the second contact being separated from each other and controlling the second contact, and the second control coil may be connected to the timer. Thus, when the timer outputs a voltage signal, the second control coil can be electrified and excited; the second control coil controls the second contact to be closed in the electrified state; when the second contact is in a closed state, the second relay can output a level signal. In the embodiment of the application, the second relay can trigger and output the flashover protection action signal when detecting the high-level signal output by the timer.
According to the generator-transformer set protection device provided by the embodiment of the application, the logic control module is provided with a first end, a second end and a third end, the first end of the logic control module is connected with the circuit breaker position detection module, the second end of the logic control module is connected with the current detection module, and the third end of the logic control module is connected with the delay module; the delay module is provided with a first end and a second end, the first end of the delay module is connected with the logic control module, and the second end of the delay module is connected with the action outlet module. Like this, detect at circuit breaker position detection module and current detection module and have under the condition of fracture flashover, action export module is with flashover protection action signal output to sending and becoming the group to for sending and becoming the group and providing flashover protection action, realized sending and becoming group protection device's fracture flashover protection function.
Further, the protection device for the generator-transformer set provided by the embodiment of the present application is, as shown in fig. 2, in the protection device for the generator-transformer set, the logic control module is connected to the logic gate element, the logic gate element has a first input end, a second input end and an output end, the first input end is connected to the circuit breaker position detection module, the second input end is connected to the current detection module, and the output end is connected to the delay module.
It will be appreciated that the output of the and logic gate element may output a high signal if its first input receives a high signal and its second input receives a high signal. Specifically, when the circuit breaker position detection module outputs a high level signal and the current detection module outputs a high level signal, the output terminal of the and logic gate element outputs a high level signal. In the embodiment of the application, the circuit breaker position detection module outputs a high-level signal to indicate that the circuit breaker is in the opening position; the current detection module outputs a high level signal to indicate that the current value of the circuit breaker is greater than a preset fixed current value, and the preset fixed current value can be a circuit breaker flashover protection fixed value. Generally, if the circuit breaker position detection module and the current detection module output high level signals, it indicates that the flashover protection action needs to be provided for the generator set. And the AND logic gate element outputs a high level signal when the breaker position detection module and the current detection module both output the high level signal, so that the accuracy of the current detection module for outputting the high level signal can be effectively improved, and the phenomenon that the generator-transformer unit protection device falsely triggers a flashover protection action signal when the breaker is at a switching-on position is avoided.
Further, in the generator-transformer group protection device, as shown in fig. 2, the generator-transformer group protection device further includes a current transformer; the current detection module is provided with a first end and a second end, the first end of the current detection module is connected with the current transformer, and the second end of the current detection module is connected with the logic gate element.
It can be understood that the current transformer is used for collecting the current value of the breaker fracture. In the grid connection process of the generator-transformer unit, the voltage directions of two sides of the breaker are 180 degrees, and when the voltage of the motor to be connected rises to the rated voltage, the voltage value of the breaker break is very large, and the current value of the breaker break can be safely collected due to the fact that the current transformer has the characteristic of electrical isolation.
In addition, in the generator-transformer set protection device provided by the embodiment of the application, the current detection module can start the detection function of the current detection module when the detected current value of the circuit breaker reaches 0.1 time of the rated current of the circuit breaker; and when the detected current value does not reach 0.1 time of the rated current of the circuit breaker, closing the detection function of the current detection module. Like this, the generator-transformer unit protection device that this application embodiment provided still has the function of automatic switching: the flashover protection automatically quits operation after the generator-transformer unit is normally connected to the grid, and automatically puts into operation after the generator-transformer unit is disconnected, so that the electric quantity is effectively saved.
Further, in the generator-transformer set protection device, as shown in fig. 2, the delay module is a timer. The timer has a time delay function. The timer may be configured to obtain a high level signal output by the and logic gate element, and output the high level signal to the action exit module after a time that the high level signal is continuously output reaches a preset time value (e.g., 100 milliseconds). Therefore, the high-level signal is output after the preset time value (for example, 100 milliseconds) is delayed, the reliability of the flashover protection action signal can be improved, and the high-level signal which is triggered by mistake is prevented from being output to the action exit module. For example, when the time for which the high level signal erroneously touched by the current detection module is continuously triggered is less than the preset time value, for example, the high level signal erroneously touched by the current detection module only lasts for 50 milliseconds and is less than 100 milliseconds, the high level signal erroneously touched cannot be output to the action exit module by the timer, and the reliability of the flashover protection action signal is improved.
In a second aspect, an apparatus for protecting a generator-transformer set is provided in an embodiment of the present application. The hair-change group protection device provided by the embodiment of the application is described below with reference to fig. 3 to 5.
As shown in fig. 3, in an embodiment of the present application, a protection device for a generator-transformer group includes: a hair-change group and a hair-change group protection device as described in the first aspect;
the generator-transformer group comprises a generator, a transformer and a breaker;
the transformer is a step-up transformer and is provided with a first end and a second end, the first end of the transformer is connected with the generator, and the second end of the transformer is connected with the circuit breaker;
the circuit breaker position detection module and the current detection module are respectively connected with the circuit breaker, and the action outlet module is connected with the generator.
In this application embodiment, circuit breaker position detection module is connected with the circuit breaker and is used for detecting the position of circuit breaker, circuit breaker position detection module can be when detecting that the circuit breaker is in the position of separating brake high level signal. The method comprises the following steps that a breaker position detection module detects that a breaker is in a tripping position, and determines that a generator-transformer unit is in a grid-connected state; and under the condition that the breaker position detection module detects that the breaker is at the switching-on position, determining that the generator-transformer set is not in the grid-connected state. If the generator-transformer set is in a grid-connected state, a breaker in the generator-transformer set may have a fracture flashover accident.
In the protection equipment of generator transformer group that this application embodiment provided, the current detection module with the circuit breaker is connected, the current detection module can be greater than circuit breaker flashover protection definite value, exportable high level signal at the current value that detects the circuit breaker.
According to the embodiment of the application, when circuit breaker position detection module and current detection module all output high level signal, send and become group protection device and can detect and send and become the group and have the fracture flashover, logic control module generates high level signal output to delay module, and delay module is in after the time of high level signal continuous output reached preset time value, with high level signal output to action export module, action export module can be based on the high level signal output flashover protection action signal of receipt, action export module with the generator is connected, and action export module exports flashover protection action signal output to the generator to for sending and becoming the group and providing flashover protection action, realized sending the fracture flashover protection function who becomes the group.
In addition, in the asynchronous grid-connection process of the generator-transformer unit or under the condition that the breaker is switched on by mistake, the generator-transformer unit protection equipment provided by the embodiment of the application can trigger a flashover protection action signal to provide flashover protection action for the generator-transformer unit. Therefore, the generator-transformer unit protection device provided by the embodiment of the application further has the function of identifying asynchronous grid connection and false switching-on.
Further, in the generator-transformer set protection device, as shown in fig. 3, the generator-transformer set protection device further includes a current transformer, and the current detection module is connected to the circuit breaker through the current transformer.
Specifically, the current transformer has a first end and a second end, the first end of the current transformer is connected with the circuit breaker, and the second end of the current transformer is connected with the first end of the current detection module. It can be appreciated that the current transformer can be used to collect the current value of the circuit breaker. In the grid connection process of the generator-transformer unit, the voltage directions of two sides of the circuit breaker are 180 degrees, and when the voltage of the motor to be connected rises to the rated voltage, the voltage value of the circuit breaker is very large, and the current value of the circuit breaker can be safely collected due to the fact that the current transformer has the characteristic of electrical isolation.
Further, in the generator-transformer-group protection device, the circuit breaker includes a position auxiliary contact, and the circuit breaker position detection module is connected to the position auxiliary contact.
In a specific embodiment, the circuit breaker position detection module is connected with a position auxiliary contact of the circuit breaker. The position auxiliary contact of the circuit breaker is used for reflecting the position of the circuit breaker, and the position of the circuit breaker comprises an opening position and a closing position. The position auxiliary contact of the circuit breaker comprises three normally closed contacts which are connected in series, wherein the normally closed contacts are contacts which are in a closed state under the condition of no power supply. If the three normally closed contacts are detected to be in the closed state, determining that the breaker is in the opening position; and if the three normally closed contacts are detected to be in the opening state, determining that the breaker is in the switching-on position. Therefore, the breaker is determined to be in the opening position only under the condition that the three normally closed contacts are in the closing state at the same time, the reliability of the position auxiliary contact of the breaker is high, and the accuracy of determining the position of the breaker can be improved.
Specifically, when the circuit breaker is in the opening position, the position auxiliary contact of the circuit breaker is closed, and the circuit breaker position detection module can output a high-level signal. That is, the circuit breaker position detection module may output a high level signal when detecting that the circuit breaker is in the trip position.
For example, the circuit breaker is at least one circuit breaker, and may be one circuit breaker, two circuit breakers, or more than two circuit breakers. Correspondingly, the generator-transformer group protection device provided by the embodiment of the application can respectively carry out fracture flashover protection on each circuit breaker. For example, the circuit breaker may be two circuit breakers including a first circuit breaker having a first position auxiliary contact and a second circuit breaker having a second position auxiliary contact. Correspondingly, the protection device that becomes group that this application embodiment provided carries out fracture flashover protection to first circuit breaker and second circuit breaker respectively, it has first circuit breaker position detection module and second circuit breaker position detection module to become group protection device, first circuit breaker position detection module with the auxiliary contact in first position is connected, second circuit breaker position detection module with the auxiliary contact in second position is connected.
Fig. 4 is a schematic diagram of a secondary control loop of the generator-transformer unit protection device according to the embodiment of the present application. As shown in fig. 4, a dc power supply, an air switch, a generator-transformer set protection device, a first circuit breaker and a second circuit breaker may be placed in the power distribution cabinet, the dc power supply may be a power supply with a rated voltage of 110V, the generator-transformer set protection device 20 has a first end, a second end and a third end, the first end of the generator-transformer set protection device 20 is connected to the negative electrode of the dc power supply through the first air switch 10, the second end of the generator-transformer set protection device is connected to the first position auxiliary contact 31, the third end of the generator-transformer set protection device is connected to the second position auxiliary contact 32, and the first position auxiliary contact 31 and the second position auxiliary contact 32 are both connected to the positive electrode of the dc power supply through the second air switch 40. Wherein the first position auxiliary contact 31 may be formed of three normally closed contacts connected in series with each other: the normally closed contact comprises a first normally closed contact 1DLA, a second normally closed contact 1DLB and a third normally closed contact 1 DLC; the second position auxiliary contact 32 may be formed of three normally closed contacts connected in series with each other: a fourth normally-closed contact 2DLA, a fifth normally-closed contact 2DLB, and a sixth normally-closed contact 2 DLC.
When the circuit breaker position detection module detects the position of the circuit breaker, the first air switch and the second air switch are both in a closed state, and power is supplied by the direct-current power supply.
Thus, when the first circuit breaker is in the opening position, the three normally-closed contacts 1DLA, 1DLB and 1DLC in the first position auxiliary contact 31 are all in the closed state, the secondary control loop formed by the dc power supply, the first air switch, the generator-transformer group protection device, the first position auxiliary contact and the second air switch is turned on, and the first circuit breaker position detection module of the generator-transformer group protection device can receive the high-level signal output by the dc power supply to determine that the first circuit breaker is in the opening position.
Similarly, when the second circuit breaker is in the opening position, the three normally-closed contacts 2DLA, 2DLB, and 2DLC in the second position auxiliary contact 32 are all in the closed state, a secondary control loop formed by the dc power supply, the first air switch, the generator/transformer group protection device, the second position auxiliary contact, and the second air switch is turned on, and a second circuit breaker position detection module of the generator/transformer group protection device can receive a high level signal output by the dc power supply to determine that the second circuit breaker is in the opening position.
Further, in this embodiment of the application, as shown in fig. 3, the generator-transformer group protection device further includes a signal plate, the signal plate has a first end and a second end, the first end of the signal plate is connected to the action exit module, and the second end of the signal plate is connected to the generator.
It can be understood that, in the generator-transformer unit protection device, the action outlet module may output a flashover protection action signal, where the flashover protection action signal is used to disconnect the generator to stop the grid-connection process of the generator-transformer unit, so as to implement a fracture flashover protection function. It should be noted that the action exit module is connected with the generator through a signal plate, and the signal plate is used for controlling the generator to perform splitting. For example, the action export module may be configured to output the flashover protection action signal to a control system in the power system, and the control system provides a flashover protection action for the generator-transformer set. The signal board may be a control unit disposed in a control system, for example, the signal board may be an operation station disposed in a distributed thermal control system, and is configured to receive a flashover protection operation signal output by an operation exit module of a protection device of a transceiver group, and control the generator to perform disconnection based on the flashover protection operation signal.
Further, in the embodiment of the present application, as shown in fig. 3, the generator-transformer set protection device further includes a field suppression switch, where the field suppression switch is connected to the generator; the signal plate is provided with a third end, and the third end of the signal plate is connected with the demagnetization switch. Specifically, the action outlet module is connected with a de-excitation switch through the signal plate, and the de-excitation switch is connected with the generator and used for de-excitation of the generator. Wherein the field suppression switch may be connected with a rotor of the generator. The signal board can receive a flashover protection action signal output by an action outlet module of the transmitting and transforming set protection device, and controls the turn-off switch to be turned on based on the flashover protection action signal, so that the generator is controlled to be de-energized, the grid connection process of the transmitting and transforming set is stopped, and the influence on the safe and stable operation of the power system is reduced.
Further, in this embodiment of the application, as shown in fig. 3, the generator-transformer set protection device further includes a hard pressing plate, and the first end of the signal plate is connected to the action outlet module through the hard pressing plate.
The hard pressing plate is a protection pressing plate and has the function of breaking a circuit, and the closing and opening of the hard pressing plate represent the operation of putting in and quitting the flashover protection function of the generator-transformer group protection device. It will be appreciated that manual closing of the hard pressure plate may cause the generator set protection device to engage in the flashover protection function. For example, when the generator-transformer set normally operates, the circuit breaker can be in a closing state, and the hard pressing plate can be manually opened to enable the generator-transformer set protection device not to output flashover protection action signals, so that the flashover protection action signals are prevented from being mistakenly touched when the generator-transformer set normally operates.
For example, when the circuit breaker includes first circuit breaker and second circuit breaker, the protection equipment of the group is changeed in sending that this application embodiment provided carries out fracture flashover protection to first circuit breaker and second circuit breaker respectively, send and become group protection equipment and have first action export module and second action export module, still have first hard clamp plate and the hard clamp plate of second, first action export module with first hard clamp plate is connected, second action export module with the hard clamp plate of second is connected.
Fig. 5 is a schematic diagram of a secondary control loop of the generator-transformer unit protection device according to the embodiment of the present application. In a specific embodiment, as shown in fig. 5, the generator set protection device includes a control dc power supply, a third contact 1BJ, a fourth contact 2BJ, a first hard pressing plate 1LP, a second hard pressing plate 2LP, and a signal plate. The control direct-current power supply, the third joint 1BJ, the first hard pressing plate 1LP and the signal plate are sequentially connected; the control direct-current power supply, the fourth contact 2BJ, the second hard pressing plate 2LP and the signal plate are connected in sequence.
Wherein the first motion exit module may be a third relay, and the third relay may include a third contact 1BJ and a third control coil, which is separated from the third contact and is used to control the third contact. Under the condition that first circuit breaker takes place the fracture flashover, first action export module can be used to output first flashover protection action signal, and third contact 1BJ is closed promptly, first action export module outputs first flashover protection action signal to the signal board to control generator de-excitation and separate.
Wherein the second motion exit module may be a fourth relay, and the fourth relay may include a fourth contact 2BJ and a fourth control coil, which is separated from the fourth contact and is used to control the fourth contact. Under the condition that the second circuit breaker has a fracture flashover, the second action export module can be used for outputting a second flashover protection action signal, namely the fourth contact 2BJ is closed, and the second action export module outputs the second flashover protection action signal to the signal board so as to control the de-excitation and the splitting of the generator.
It should be understood by those skilled in the art that the foregoing is only exemplary of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A generator-transformer set protection device, comprising: the circuit breaker comprises a circuit breaker position detection module, a current detection module, a logic control module, a time delay module and an action outlet module;
the logic control module is provided with a first end, a second end and a third end, the first end of the logic control module is connected with the circuit breaker position detection module, the second end of the logic control module is connected with the current detection module, and the third end of the logic control module is connected with the time delay module;
the delay module is provided with a first end and a second end, the first end of the delay module is connected with the logic control module, and the second end of the delay module is connected with the action outlet module.
2. The generator-transformer group protection device of claim 1, wherein the logic control module is an and logic gate element having a first input connected to the circuit breaker position detection module, a second input connected to the current detection module, and an output connected to the delay module.
3. The generator-transformer group protection device of claim 2, further comprising a current transformer;
the current detection module is provided with a first end and a second end, the first end of the current detection module is connected with the current transformer, and the second end of the current detection module is connected with the logic gate element.
4. The apparatus of claim 1, wherein the delay module is a timer.
5. A generator-transformer group protection device, comprising: a hair-change group and a hair-change group protection device as claimed in any one of claims 1 to 4;
the generator-transformer group comprises a generator, a transformer and a breaker;
the transformer is a step-up transformer and is provided with a first end and a second end, the first end of the transformer is connected with the generator, and the second end of the transformer is connected with the circuit breaker;
the circuit breaker position detection module and the current detection module are respectively connected with the circuit breaker, and the action outlet module is connected with the generator.
6. The generator-transformer group protection device of claim 5, wherein the current detection module is connected to the circuit breaker through a current transformer.
7. The fire-transformer group protection device of claim 5, wherein the circuit breaker comprises a position auxiliary contact, and wherein the circuit breaker position detection module is connected to the position auxiliary contact.
8. The generator-transformer group protection device of claim 5, further comprising a signal plate having a first end and a second end, the first end of the signal plate being connected to the action egress module and the second end of the signal plate being connected to the generator.
9. The generator-transformer group protection device of claim 8, further comprising a field-suppression switch connected to the generator;
the signal plate is provided with a third end, and the third end of the signal plate is connected with the demagnetization switch.
10. The fire-transformer group protection device of claim 8, further comprising a hard pressure plate, wherein the first end of the signal plate is connected to the action egress module through the hard pressure plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114094542A (en) * | 2021-11-24 | 2022-02-25 | 内蒙古国华准格尔发电有限责任公司 | Voltage protection method and control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094542A (en) * | 2021-11-24 | 2022-02-25 | 内蒙古国华准格尔发电有限责任公司 | Voltage protection method and control device |
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