CN211236675U - Calibration device for automatic tuning controller of arc suppression coil - Google Patents

Abstract

The utility model discloses an arc suppression coil automatic tuning controller calibration device, comprising an input line, a single-phase transformer, an adjustable capacitor, a test line, a voltage display module and a current display module; the single-phase transformer includes a primary winding and a secondary winding Winding, the input wire is electrically connected to both ends of the primary winding, and the two ends of the secondary winding are electrically connected to the two ends of the adjustable capacitor; the test wire includes a fixed end and a test end, and the number of test wires is two, two The fixed end of the test wire is electrically connected to both ends of the adjustable capacitor, and the test end of the test wire is suspended; the voltage display module and the current display module are respectively electrically connected to the test wire. The automatic tuning controller verification device of the arc suppression coil ensures the accuracy of the measurement data of the automatic tuning controller, thereby ensuring that the automatic tuning line selection device can play an arc suppression function according to a preset method and ensure the safety of the power grid.

Description

A verification device for automatic tuning controller of arc suppression coil

technical field

The utility model relates to the field of electrical tools, in particular to an arc suppression coil automatic tuning controller calibration device.

Background technique

With the continuous development of the national economy and the continuous improvement of the power system, the safe operation of the power system and the reliability of the power supply have become more and more important, and the choice of the neutral point grounding method is an important factor that directly affects the above two indicators. With the expansion of urban and rural power grids and the increase of cable outlets, the capacitance current of the system to the ground increases sharply, and the fault current flowing through the single-phase grounding is large, the arc is not easy to extinguish, and it is easy to generate intermittent arc grounding overvoltage, resulting in a significant increase in the accident trip rate. .

In order to solve the above problems, the national power grid generally adopts the resonance grounding method, that is, the arc suppression coil is installed at the neutral point. When single-phase grounding occurs, since the inductive current generated by the arc suppression coil compensates the capacitive current at the fault point, the residual current at the fault point becomes smaller, so as to achieve the purpose of natural arc extinguishing, preventing the expansion of the accident or even eliminating the accident. The operating experience shows that the arc suppression coil has obvious effects on suppressing the intermittent arc overvoltage and ferromagnetic resonance overvoltage, reducing the accident trip rate of the line, reducing personal casualties and equipment damage. Therefore, the power industry standard DL/T 620-1997 "Overvoltage Protection and Insulation Coordination of AC Electrical Installations" clearly stipulates that the system composed of 3~10kV overhead lines and all 35 and 66kV power grids, when the single-phase grounding fault current is greater than I0A When the single-phase grounding fault current is greater than 30A, the neutral point should be equipped with an arc suppression coil.

Figure 1 shows a schematic diagram of a complete set of XHK-II-ZP+ type arc suppression coil automatic tuning and grounding line selection, wherein 2TM is a grounding transformer, 2LF is an on-load arc suppression coil, IZR and 2ZR are parallel resistors, 2R For the equivalent damping resistance, 2QS is a single-pole isolating switch, 2TV is a neutral point voltage transformer, 2TA is a neutral point current transformer, and the controller is assembled in the PK screen.

Figure 2 shows the schematic diagram of the display screen of the XHK-II-ZP+ type arc suppression coil automatic tuning and grounding line selection complete set of equipment in the running state. Specifically, the controller will be provided with a display screen to display the electrical condition of the power grid. Referring to Figure 3 of the accompanying drawings, the display contents on the display screen include adjustment gear, midpoint voltage, midpoint current, capacitance current, residual, Detuning degree and other parameters, the above parameters are real-time detected data inside the controller; because the continuous working time of the device is long, and there is no internal calibration setting, if the detected data appears due to the aging or inaccuracy of the device If there is a problem, the arc suppression effect will be poor, and safety hazards are likely to occur.

Utility model content

In order to overcome the defects of the existing arc suppression coil automatic tuning and grounding line selection complete sets, the utility model provides an arc suppression coil automatic tuning controller calibration device, which ensures the accuracy of the measurement data of the automatic tuning line selection device, thereby ensuring The automatic tuning and line selection device can play an arc-extinguishing role in a preset way to ensure the safety of the power grid.

Correspondingly, the utility model provides an arc suppression coil automatic tuning controller calibration device, which includes an input line, a single-phase transformer, an adjustable capacitor, a test line, a voltage display module and a current display module;

The single-phase transformer includes a primary winding and a secondary winding, the input line is electrically connected to both ends of the primary winding, and the two ends of the secondary winding are respectively electrically connected to both ends of the adjustable capacitor;

The test lead includes a fixed end and a test end, the number of the test lead is two, and the fixed ends of the two test leads are respectively electrically connected to both ends of the adjustable capacitor. end hanging;

The voltage display module and the current display module are respectively electrically connected to the test wire.

In an optional implementation manner, the input voltage of the primary winding of the single-phase transformer is 200V to 240V.

In an optional embodiment, the output voltage of the secondary winding of the single-phase transformer is 30V to 80V.

In an optional implementation manner, the capacitance value of the adjustable capacitor ranges from 1 μF to 10 μF.

In an optional embodiment, the voltage display module includes a voltage acquisition circuit and a voltage display screen.

In an optional embodiment, the current display module includes a current acquisition circuit and a current display screen.

In an optional embodiment, the arc suppression coil automatic tuning controller verification device further includes a housing and a knob, the adjustable capacitor is arranged in the housing, and the knob passes through the surface of the housing and is connected to the knob. Adjustable capacitor connection.

In an optional embodiment, a capacitance scale is marked on the outer circumference of the knob on the surface of the housing.

The utility model provides an arc suppression coil automatic tuning controller verification device, which can calibrate the data accuracy of the arc suppression coil automatic tuning controller to ensure the arc suppression coil automatic tuning The accuracy of the data measurement of the controller ensures that the automatic tuning controller of the arc suppression coil can play the arc suppression function according to the preset method and ensure the safety of the power grid.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Figure 1 shows a schematic diagram of a complete set of XHK-II-ZP+ type arc suppression coil automatic tuning and grounding line selection;

Fig. 2 shows the schematic diagram of the display screen of the XHK-II-ZP+ type arc suppression coil automatic tuning and grounding line selection complete set device in the running state;

Fig. 3 shows the structural schematic diagram of the calibration device of the automatic tuning controller calibration device of the arc suppression coil of the present embodiment;

FIG. 4 shows a schematic diagram of the working structure of the verification device for the automatic tuning controller of the arc suppression coil in this embodiment.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

FIG. 3 shows a schematic structural diagram of the verification device for the automatic tuning controller of the arc suppression coil in this embodiment.

The utility model provides an arc suppression coil automatic tuning controller calibration device, comprising a casing 1, an input line 2, a single-phase transformer 5, an adjustable capacitor 6, a knob 7, a test line 8, a voltage display module 11 and a current Display module 10 .

The casing 1 is used for fixing the high-voltage components of the arc suppression coil automatic tuning controller calibration device inside, and the knob 7 is arranged on the surface of the casing 1 for easy operation, and the voltage display module is supplied. The voltage display screen of 11 and the current display screen of the current display module 10 are fixed on the surface of the housing 1 for easy observation.

Specifically, the single-phase transformer 5 is arranged in the casing 1 . The single-phase transformer 5 includes a primary winding 3 and a secondary winding 4, the input line 2 is electrically connected to both ends of the primary winding 3, and the two ends of the secondary winding 4 are respectively connected to the adjustable capacitor 6. Both ends are electrically connected.

Optionally, the input line 2 can be connected to commercial power. Equivalently, the input voltage of the primary winding of the single-phase transformer is 200V to 240V.

Correspondingly, optionally, the output voltage of the secondary winding 4 of the single-phase transformer is 30V to 80V.

Optionally, the adjustable capacitor 6 is arranged in the housing 1 , the knob 7 is arranged on the surface of the housing 1 , and the knob 7 passes through the surface of the housing 1 to connect with the adjustable capacitor 6 . connected to adjust the capacitance of the adjustable capacitor 6 .

Both ends of the adjustable capacitor 6 are electrically connected to the secondary winding 4 .

Optionally, a capacitance scale is marked on the outer periphery of the knob 7 on the surface of the casing 1 .

Optionally, the capacitance value of the adjustable capacitor 6 ranges from 1 μF to 10 μF.

Specifically, the test wire includes a fixed end and a test end, and the number of the test wire is two, which are a first test wire 8 and a second test wire 9 respectively.

The fixed ends of the two test wires are electrically connected to the two ends of the adjustable capacitor 6, respectively, and the test ends of the test wires are suspended in the air, which is used for automatic tuning with the external arc suppression coil and the complete set of grounding line selection. sexual connection.

Specifically, the voltage display module 10 and the current display module 11 are respectively electrically connected to the test lead.

Wherein, the voltage display module 10 includes a voltage acquisition circuit and a voltage display screen. The voltage display module 10 is used to obtain the voltage between the two test wires (ie the voltage to ground) and display it on the voltage display screen on the surface of the casing.

The current display module includes a current acquisition circuit and a current display screen. The current display module 11 is used to obtain the current of the test line (ie, the capacitive current) and display it on the current display screen on the surface of the casing.

Specifically, the voltage display module 10 can use an existing digital display voltmeter or a digital display voltage circuit, and the current display module can use an existing digital display ammeter or a digital display current measurement circuit.

In conjunction with the schematic diagram of the XHK-II-ZP+ type arc suppression coil automatic tuning and grounding line selection complete set shown in Figure 1 of the accompanying drawings, the working mode of the arc suppression coil automatic tuning controller verification device provided by the present embodiment is as follows:

Figure 4 shows a schematic diagram of the working structure of the automatic tuning controller verification device for the arc suppression coil.

When the arc suppression coil automatic tuning controller verification device of this embodiment is applied to the XHK-II-ZP+ type arc suppression coil automatic tuning and grounding line selection complete set, first select a single-phase line, and one of the two test lines is used. One test lead is connected to the rear end of the single-pole isolating switch (1QS or 2QS), and the other test lead can be grounded (equivalent). 2TM is the grounding transformer, 2LF is the on-load arc suppression coil, 2ZR is the parallel resistance, 2R is the equivalent damping resistance, 2QS is the single-pole isolating switch, 2TV is the neutral point voltage transformer, and 2TA is the neutral point current mutual inductance controller, the controller is assembled in the PK screen.

In the specific implementation, the unipolar isolating switch is disconnected, the input line of the arc suppression coil automatic tuning controller verification device is energized, and the test line externally outputs the voltage and capacitor current. At this time, the current display current of the verification device is I ₁ , and the voltage The voltage of the display screen is U ₁ . According to the calculation principle of the capacitance current of the automatic tuning line selection device, it can be estimated that the capacitance current value is: I _C = 2πfc ₁ u _N (u _N is the system phase voltage); Compare the mid-point voltage, mid-point current and capacitor current displayed in the menu to verify whether the data sampling and calculation of the arc suppression coil controller are correct.

In addition, each gear of the arc suppression coil corresponds to an inductance current, and the corresponding capacitance current can be calculated according to the data provided by the system, and then the capacitance can be calculated. Then, by adjusting the capacitance adjustment knob of the calibration device to the corresponding value, the elimination of Whether the gear shifting function of the arc coil controller is correct.

The embodiment of the utility model provides a verification device for an automatic tuning controller of an arc suppression coil. The automatic tuning controller verification device for an arc suppression coil uses the commercial power input to simulate the circuit state of the fault current flowing through the single-phase grounding, and uses The voltage indication and current indication of the automatic tuning controller of the arc suppression coil are used to calibrate the accuracy of the acquired data of the arc suppression coil controller, and the arc suppression coil controller can be calibrated to ensure the normal operation of the arc suppression coil controller. Has good practicality.

The above is a detailed introduction to an arc suppression coil automatic tuning controller verification device and a grounding set provided by the embodiment of the present utility model. In this paper, specific examples are used to illustrate the principle and implementation of the present utility model. The description of the above embodiment is only used to help understand the method of the present utility model and its core idea; meanwhile, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific embodiment and the scope of application. In conclusion, the content of this specification should not be construed as a limitation to the present invention.

Claims (8)

1. an arc suppression coil automatic tuning controller calibration device, is characterized in that, comprises input line, single-phase transformer, adjustable capacitance, test line, voltage display module and current display module; The single-phase transformer includes a primary winding and a secondary winding, the input line is electrically connected to both ends of the primary winding, and the two ends of the secondary winding are respectively electrically connected to both ends of the adjustable capacitor; The test lead includes a fixed end and a test end, the number of the test lead is two, and the fixed ends of the two test leads are respectively electrically connected to both ends of the adjustable capacitor. end hanging; The voltage display module and the current display module are respectively electrically connected to the test wire. 2 . The automatic tuning controller verification device for an arc suppression coil according to claim 1 , wherein the input voltage of the primary winding of the single-phase transformer is 200V to 240V. 3 . 3 . The automatic tuning controller verification device for an arc suppression coil according to claim 2 , wherein the output voltage of the secondary winding of the single-phase transformer is 30V to 80V. 4 . 4 . The device for checking the automatic tuning controller of an arc suppression coil according to claim 1 , wherein the capacitance value of the adjustable capacitor ranges from 1 μF to 10 μF. 5 . 5. The arc suppression coil automatic tuning controller verification device according to claim 1, wherein the voltage display module comprises a voltage acquisition circuit and a voltage display screen. 6 . The automatic tuning controller verification device for an arc suppression coil according to claim 1 , wherein the current display module comprises a current acquisition circuit and a current display screen. 7 . 7. The arc suppression coil automatic tuning controller verification device according to any one of claims 1 to 6, characterized in that, the arc suppression coil automatic tuning controller verification device further comprises a housing and a knob, and the The adjustable capacitor is arranged in the casing, and the knob is connected to the adjustable capacitor through the surface of the casing. 8 . The automatic tuning controller calibration device for an arc suppression coil according to claim 7 , wherein the outer circumference of the knob is marked with a capacitance scale on the surface of the casing. 9 .

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