Circuit and device for testing overvoltage suppression capability of arc extinguishing device

Abstract

The utility model relates to a circuit and a device for testing the overvoltage suppression capability of an arc extinguishing device. The circuit comprises a test hub module, a test power supply module, a fault simulation module, a grounding capacitor module, a test control module and an analog quantity measurement module, the test hub module comprises a three-phase bus and a neutral point, and the neutral point is used for being connected with a tested arc extinction device; the test power supply module is connected with the three-phase bus and the neutral point; the fault simulation module is connected with one phase of the three-phase bus; the grounding capacitor module is connected with the three-phase bus; the test control module is connected with the fault simulation module and the grounding capacitor module; and the analog quantity measurement module is connected with the fault simulation module and the grounding capacitor module. According to the utility model, the overvoltage suppression capability of the arc-extinguishing device to be tested in the simulation environment can be tested, and workers can be helped to carry out accurate model selection on the arc-extinguishing device.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power plant electric power equipment technical field especially, it relates to arc extinguishing device overvoltage suppression capability test circuit and device. BACKGROUND

[0002] The main role of arc extinguishing device is to suppress ground overvoltage, arc overvoltage, and overvoltage suppression capability is the key parameter of detecting arc extinguishing device performance. Because the special tool that can test the overvoltage suppression capability of arc extinguishing device is lacked in current nuclear power plant, leading to arc extinguishing device can only be based on the working parameter of distribution system to carry out theoretical calculation and match type, and then be installed to distribution system, there is the risk of mismatching type, influence the safety of distribution system. INVENTION CONTENTS

[0003] The utility model solves the technical problem in at, provide a kind of arc extinguishing device overvoltage suppression capability test circuit and device.

[0004] The utility model discloses a kind of arc extinguishing device overvoltage suppression capability test circuits, including test hub module, test power module, fault simulation module, ground capacitance module, test control module and analog measurement module;

[0005] The test hub module includes three-phase busbar and neutral point, and the neutral point is used to connect the arc extinguishing device to be measured;

[0006] The test power module is connected with the three-phase busbar and the neutral point, and is used to output high-voltage three-phase power to the three-phase busbar;

[0007] The fault simulation module is connected with one phase of the three-phase busbar, and is used to simulate single-phase ground fault of the high-voltage three-phase power supply;

[0008] The ground capacitance module is connected with the three-phase busbar, and is used to control the output current of the high-voltage three-phase power supply;

[0009] The test control module is connected with the fault simulation module and the ground capacitance module, and is used to control the fault simulation module and the ground capacitance module to work;

[0010] The analog measurement module is connected with the fault simulation module and the ground capacitance module, and is used to measure the ground fault voltage and ground capacitance current when single-phase ground fault occurs.

[0011] Preferably, the test power module includes a voltage stabilizing module and a voltage boosting module;

[0012] The voltage stabilizing module is used to connect input power and convert the input power into low-voltage stabilized power supply.

[0013] The booster module is connected with the voltage stabilizing module at the input end and connected with the three-phase bus at the output end, and the neutral ground end is connected with the neutral point, for boosting the low-voltage voltage stabilizing power supply to the high-voltage three-phase power supply.

[0014] Preferably, the voltage stabilizing module comprises a voltage stabilizer with the model of SBW-150KVA200kva, and / or the booster module comprises an epoxy resin transformer with the model of SCB10-300KVA.

[0015] Preferably, the fault simulation module comprises an intelligent grounding fault simulation cabinet with the model of XFUK-46.

[0016] Preferably, the analog quantity measurement module comprises a voltage measurement unit and a current measurement unit.

[0017] The voltage measurement unit is connected with the fault simulation module to measure the grounding fault voltage.

[0018] The current measurement unit is connected with the grounding capacitor module to measure the grounding capacitor current.

[0019] Preferably, the grounding capacitor module comprises a plurality of capacitor groups, each of which is connected between the three-phase bus and the ground, and each of which is also connected with the test control module.

[0020] Preferably, each of the capacitor groups comprises a second contactor and three capacitors with the same capacitance.

[0021] The second contactor comprises a second excitation coil and a three-way second normally open contact loop, the second excitation coil is connected with the test control module, and the first ends of the three-way second normally open contact loop are connected with the three phases of the three-phase bus one by one, and the second ends of the three-way second normally open contact loop are connected to the ground through the three capacitors one by one.

[0022] Preferably, the number of the capacitor groups is 6.

[0023] Preferably, the overvoltage suppression capability test circuit of the arc-extinguishing device further comprises:

[0024] A result output module is connected with the analog quantity measurement module to receive the grounding fault voltage and output the overvoltage capability value.

[0025] The utility model also provides an arc-extinguishing device overvoltage suppression capability test device, including above-mentioned arc-extinguishing device overvoltage suppression capability test circuit.

[0026] The utility model discloses have the following beneficial effects: provide a kind of arc-extinguishing device overvoltage suppression capability test circuit, can simulate the simulation environment of multiple ground fault types of high-voltage three-phase power supply under different output current working conditions, and test the overvoltage suppression capability of the arc-extinguishing device under these simulation environments, can help staff to accurately select arc-extinguishing device, help to improve the security of distribution system. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model will be further described below, and the drawings are as follows:

[0028] Figure 1 It is the circuit structure block diagram of arc-extinguishing device overvoltage suppression capability test circuit in some embodiments of the utility model;

[0029] Figure 2 It is the circuit principle diagram of ground capacitor module in some embodiments of the utility model;

[0030] Figure 3 It is the circuit structure block diagram of test control module in some embodiments of the utility model. DETAILED DESCRIPTION

[0031] In order to have more clear understanding of the technical features, purposes and effects of the utility model, the specific embodiment of the utility model will be described in detail with reference to the drawings.

[0032] In the following description, it should be understood that the orientation or positional relationship indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is constructed and operated in a particular orientation, only for the convenience of describing the technical scheme, and cannot be understood as indicating that the indicated device or element must have a particular orientation, therefore, it cannot be understood as limiting the utility model.

[0033] Figure 1 It is the circuit structure block diagram of arc-extinguishing device overvoltage suppression capability test circuit in some embodiments of the utility model. The circuit can test the overvoltage suppression capability of arc-extinguishing device, help staff to accurately select arc-extinguishing device.

[0034] Please see Figure 1 The arc-extinguishing device overvoltage suppression capability test circuit can include test hub module 1, test power module 2, fault simulation module 3, ground capacitor module 4, test control module 5 and analog measurement module 6.

[0035] The test hub module 1 comprises a three-phase bus and a neutral point for connecting the tested arc-extinguishing device. The test hub module 1 is used to provide a convenient wiring mode for the test power supply module 2, the fault simulation module 3 and the grounding capacitor module 4, and to improve the wiring efficiency between the modules. The tested arc-extinguishing device includes, but is not limited to, a phase-controlled arc-extinguishing coil (such as a phase-controlled arc-extinguishing coil with a model number of XHDCL), a turn-adjusted arc-extinguishing coil (such as a turn-adjusted arc-extinguishing coil with a model number of XHDCZ) and a controllable voltage source arc-extinguishing device (such as a controllable voltage source arc-extinguishing device with a model number of XHGFN).

[0036] In some embodiments, the test hub module 1 comprises an interface box with a model number of SDT-87.

[0037] Please refer to Figure 1 The test power supply module 2 is connected to the three-phase bus and the neutral point in the test hub module 1, and is used to output a high-voltage three-phase power supply to the three-phase bus to improve the high-voltage power supply for testing. Understandably, the voltage value of the high-voltage three-phase power supply can be adaptively adjusted according to the testing requirements. For example, when testing the arc-extinguishing device installed in a 6.3kV power distribution system, the high-voltage three-phase power supply can be set to a voltage value of 6.3kV to meet the testing requirements.

[0038] In some embodiments, as shown in Figure 1 The test power supply module 2 comprises a voltage stabilizing module 21 and a voltage boosting module 22.

[0039] The voltage stabilizing module 21 is used to access an input power supply and convert the input power supply into a low-voltage stabilized power supply. Specifically, the input power supply can be provided by a commercial power supply or a generator, and the voltage value of the low-voltage stabilized power supply can be 400V, but can also be other voltage values. Since the output power supply of the commercial power supply or the generator has fluctuation, it is not conducive to the voltage boosting module 22 to output a stable high-voltage three-phase power supply. If the high-voltage three-phase power supply has fluctuation, it will affect the testing accuracy. The role of the voltage stabilizing module 21 is to provide a stable low-voltage stabilized power supply to the voltage boosting module 22, which can improve the stability of the high-voltage three-phase power supply and thus improve the testing accuracy.

[0040] In some embodiments, the voltage stabilizing module 21 can comprise a first switch and a voltage stabilizer (not shown). The input end of the voltage stabilizer is connected to the input power supply through the first switch, and the output end of the voltage stabilizer is connected to the voltage boosting module 22 to input the low-voltage stabilized power supply thereto.

[0041] The first switch can be an existing three-phase AC contactor, the magnet coil of the three-phase AC contactor is connected to the test control module 5, the input end of the three-phase AC contactor is connected to the input power supply, and the output end of the three-phase AC contactor is connected to the input end of the voltage stabilizer. Of course, the first switch can also be replaced by a three-phase circuit breaker. In addition, the model number of the voltage stabilizer can be SBW-150KVA200kva.

[0042] The input end of the voltage boosting module 22 is connected with the voltage stabilizing module 21, the output end of the voltage boosting module 22 is connected with the three-phase bus, and the neutral grounding end of the voltage boosting module 22 is connected with the neutral point. The voltage boosting module 22 is used for boosting the low-voltage stabilized power supply to high-voltage three-phase power supply.

[0043] In some embodiments, the voltage boosting module 22 can include an epoxy transformer with a model number of SCB10-300KVA. In this case, the low-voltage side of the epoxy transformer corresponds to the input end of the voltage boosting module 22, the high-voltage side corresponds to the output end of the voltage boosting module 22, and the neutral grounding point corresponds to the neutral grounding end of the voltage boosting module 22.

[0044] Please refer to Figure 1 The fault simulation module 3 is connected with one phase of the three-phase bus of the test hub module 1, and is used for simulating a single-phase grounding fault of the high-voltage three-phase power supply to form a simulation environment in which the high-voltage three-phase power supply has a single-phase grounding fault, so as to test the performance of the tested arc-extinguishing device in this simulation environment.

[0045] In some embodiments, the fault simulation module 3 can include a first contactor K1 and an intelligent grounding fault simulation cabinet 31. The first contactor K1 includes a first exciting coil and a first normally open contact circuit. The first exciting coil is connected with the test control module 5, and the first normally open contact circuit is connected between one phase of the three-phase bus and a first end of the intelligent grounding fault simulation cabinet 31. A second end of the intelligent grounding fault simulation cabinet 31 is grounded. In this embodiment, the staff can control whether the first exciting coil is excited by operating the test control module 5, so as to control whether the first normally open contact circuit is closed or opened, and thus control whether the intelligent grounding fault simulation cabinet 31 is connected to one phase of the three-phase bus. It can be understood that when the intelligent grounding fault simulation cabinet 31 is connected to one phase of the three-phase bus, the phase will simulate a grounding fault.

[0046] In some embodiments, the intelligent grounding fault simulation cabinet 31 can have a model number of XFUK-46. The intelligent grounding fault simulation cabinet 31 simulates insulation sub-arc grounding fault, cable arc grounding fault, cable joint arc grounding fault, transition resistance grounding fault and other types of grounding faults, and can simulate a plurality of different grounding fault conditions, so as to test the performance of the tested arc-extinguishing device under different grounding fault conditions.

[0047] Please refer to Figure 1The ground capacitor module 4 is connected with the three-phase bus of the test hub module 1, and the ground capacitor module 4 is used for controlling the output current of the high-voltage three-phase power supply. The ground capacitor module 4 is used for adjusting the output current of the high-voltage three-phase power supply, so as to test the performance of the tested arc-extinguishing device under different output current conditions. It can be understood that, in cooperation with the fault simulation module 3, the ground capacitor module 4 can realize the combination of different output currents and different ground faults, so as to obtain a simulation environment of multiple different conditions, so as to more comprehensively test the performance of the tested arc-extinguishing device under multiple simulation environments, and help the staff to accurately select the type.

[0048] In some embodiments, as shown in Figure 2 The ground capacitor module 4 can include a plurality of capacitor groups 41. Each capacitor group 41 is connected between the three-phase bus and the ground, and each capacitor group 41 is also connected to the test control module 5, and the test control module 5 can control each capacitor group 41 to be connected or disconnected with the three-phase bus. In this embodiment, the capacitor group 41 is connected as a load between the three-phase bus and the ground, so the test control module 5 can control the output current of the high-voltage three-phase power supply by controlling the connection relationship of each capacitor group 41 and the three-phase bus.

[0049] Further, each capacitor group 41 can include a second contactor and three capacitors with the same capacitance. The second contactor includes a second exciting coil connected to the test control module 5 and a three-way second normally open contact circuit, and the second normally open contact circuit has a first end connected to the three phases of the three-phase bus one by one and a second end connected to the ground through the three capacitors one by one. Figure 2 For the convenience of understanding, the capacitor group 41 on the left side in Figure 2The second contactor pair of the capacitor bank 41 located on the right side corresponds to the second contactor K2_6, and the three capacitors are the A-phase capacitor C6_A, the B-phase capacitor C6_B and the C-phase capacitor C6_C. The working principle of the capacitor bank 41 is the same as that of the first capacitor bank 41, that is, the test control module 5 can control whether the second contactor in each capacitor bank 41 is excited, so as to control the increase or decrease of the output current of the high-voltage three-phase power supply, that is, to realize the control of the output current.

[0050] In some embodiments, the number of capacitor banks 41 can be 6. Further, the capacitance values of the capacitors included in the 6 capacitor banks 41 can be 0.8 microfarad, 1.7 microfarad, 4.7 microfarad, 5.6 microfarad, 6.7 microfarad and 8.1 microfarad respectively, that is, the three capacitors included in the first capacitor bank 41 have a capacitance value of 0.8 microfarad, the three capacitors included in the second capacitor bank 41 have a capacitance value of 1.7 microfarad, the three capacitors included in the third capacitor bank 41 have a capacitance value of 4.7 microfarad, the three capacitors included in the fourth capacitor bank 41 have a capacitance value of 5.6 microfarad, the three capacitors included in the fifth capacitor bank 41 have a capacitance value of 6.7 microfarad, and the three capacitors included in the sixth capacitor bank 41 have a capacitance value of 8.1 microfarad.

[0051] Please refer to Figure 1 , the test control module 5 is connected with the fault simulation module 3 and the grounding capacitor module 4, and the test control module 5 is used to control the working of the fault simulation module 3 and the grounding capacitor module 4. Specifically, the test control module 5 is used to control the on-off of the first contactor K1 and each second contactor, so as to control whether a single-phase ground fault occurs, and control the size of the output current of the high-voltage three-phase power supply.

[0052] In some embodiments, as shown in Figure 3 , the test control module 5 can include a controller 51. The controller 51 is connected with the first exciting coil of the first contactor K1 and the second exciting coil of each second contactor, so as to control whether the first exciting coil and the second exciting coil are excited.

[0053] In some embodiments, the controller 51 can be a PLC controller, which can control whether the first contactor K1 and each second contactor are excited according to a pre-stored program or an input instruction, so as to implement the test work. Wherein, the worker can input the input instruction by operating a human-computer interaction device (such as a mouse and a keyboard, etc.).

[0054] In other embodiments, the controller can be a microprocessor of the STM32 series. Since the output level of the microprocessor of the STM32 series is low, it cannot directly drive the first contactor K1 and each second contactor, therefore, in this embodiment, as shown in Figure 3As shown, the test control module 5 also includes a Darlington array 52 connected to the first excitation coil of the first contactor K1 and the second excitation coils of each second contactor. Specifically, the function of the Darlington array 52 is to amplify the output level of the controller 51 to a level sufficient to drive the first contactor K1 and each second contactor. Furthermore, the Darlington array 52 can be a Darlington integrated chip or composed of multiple Darlington transistors; no limitation is made here.

[0055] Please see Figure 1 The analog measurement module 6 is connected to the fault simulation module 3 and the grounding capacitance module 4. The analog measurement module 6 is used to measure the grounding point fault voltage and grounding capacitance current when a single-phase ground fault occurs. It should be noted that the grounding point fault voltage corresponds to the voltage to ground of the fault simulation module 3 when a single-phase ground fault occurs; the grounding capacitance current corresponds to the current to ground of the fault simulation module 3 when a single-phase ground fault occurs. Understandably, personnel can combine the grounding point fault voltage and grounding capacitance current to evaluate the performance of the tested consumable device, thereby determining whether the tested consumable device meets the application requirements.

[0056] In some embodiments, such as Figure 2 As shown, the analog measurement module 6 may include a voltage measurement unit 61 and a current measurement unit 62. The voltage measurement unit 61 is connected to the fault simulation module 3 to measure the grounding point fault voltage. The voltage measurement unit 61 may be a single-phase voltage transformer, with its primary winding connected in parallel with the fault simulation module 3, and its secondary winding outputting the grounding point fault voltage.

[0057] The current measurement unit 62 is connected to the grounding capacitor module 4 to measure the grounding capacitor current. The current measurement unit 62 can be a single-phase current transformer, which is mounted on the grounding cable of the fault simulation module 3.

[0058] To simplify the evaluation process for staff, in some embodiments, such as Figure 1 As shown, the overvoltage suppression capability test circuit of the arc suppression device may further include a result output module 7. The result output module 7 is connected to the analog quantity measurement module 6, and is used to receive the grounding point fault voltage and output the overvoltage capability value. In this embodiment, the result output module 7 can determine the overvoltage capability value based on existing algorithms. Specifically, the overvoltage capability value is equal to the quotient of the peak voltage of the grounding point fault voltage divided by the rated voltage of the high-voltage three-phase power supply.

[0059] In some embodiments, the result output module 7 may include a digital signal processor (DSP) connected to the voltage measurement unit 61 and the current measurement unit 62 to receive the grounding fault voltage and grounding capacitance current, and execute a pre-stored program to calculate the overvoltage capability value. The DSP may be a TMS320VC5509APGE.

[0060] In some embodiments, the overvoltage suppression capability test circuit of the arc suppression device may further include a display module. The display module is connected to the result output module 7 and the current measurement unit 62, and is used to display the voltage capability value and the grounding point capacitance current.

[0061] Understandably, this utility model can be designed to work in conjunction with each module to simulate various grounding fault types under different output current conditions of a high-voltage three-phase power supply, and to test the overvoltage suppression capability of the arc suppression device under test in these simulated environments. This can help staff to make accurate selections for arc suppression devices and improve the safety of power distribution systems.

[0062] This utility model also provides a test device for overvoltage suppression capability of an arc suppression device, including the overvoltage suppression capability test circuit of the arc suppression device provided in the embodiment of this utility model.

[0063] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A test circuit for overvoltage suppression capability of an arc suppression device, characterized in that, It includes a test hub module (1), a test power supply module (2), a fault simulation module (3), a grounding capacitor module (4), a test control module (5), and an analog quantity measurement module (6); The test hub module (1) includes a three-phase busbar and a neutral point, the neutral point being used to connect the arc extinguishing device under test; The test power module (2) is connected to the three-phase bus and the neutral point, and is used to output high-voltage three-phase power to the three-phase bus; The fault simulation module (3) is connected to one phase of the three-phase busbar and is used to simulate a single-phase grounding fault in the high-voltage three-phase power supply. The grounding capacitor module (4) is connected to the three-phase bus and is used to control the output current of the high-voltage three-phase power supply. The test control module (5) is connected to the fault simulation module (3) and the grounding capacitor module (4) and is used to control the operation of the fault simulation module (3) and the grounding capacitor module (4); The analog measurement module (6) is connected to the fault simulation module (3) and the grounding capacitor module (4) and is used to measure the grounding point fault voltage and grounding capacitor current when a single-phase grounding fault occurs.

2. The overvoltage suppression capability test circuit of the arc suppression device according to claim 1, characterized in that, The test power supply module (2) includes a voltage regulator module (21) and a boost module (22); The voltage regulator module (21) is used to connect to the input power supply and convert the input power supply into a low-voltage regulated power supply; The boost module (22) has its input terminal connected to the voltage regulator module (21), its output terminal connected to the three-phase bus, and its neutral ground terminal connected to the neutral point, for boosting the low-voltage regulated power supply to the high-voltage three-phase power supply.

3. The overvoltage suppression capability test circuit of the arc suppression device according to claim 2, characterized in that, The voltage regulator module (21) includes a voltage regulator of model SBW-150KVA200kVA; and / or the boost module (22) includes an epoxy resin transformer of model SCB10-300KVA.

4. The overvoltage suppression capability test circuit of the arc suppression device according to claim 1, characterized in that, The fault simulation module (3) includes an intelligent grounding fault simulation cabinet (31) of model XFUK-46.

5. The overvoltage suppression capability test circuit of the arc suppression device according to claim 1, characterized in that, The analog quantity measurement module (6) includes a voltage measurement unit (61) and a current measurement unit (62); The voltage measurement unit (61) and the fault simulation module (3) are used to measure the grounding point fault voltage; The current measuring unit (62) is connected to the grounding capacitor module (4) to measure the grounding capacitor current.

6. The overvoltage suppression capability test circuit of the arc suppression device according to claim 1, characterized in that, The grounding capacitor module (4) includes multiple capacitor banks (41); each capacitor bank (41) is connected between the three-phase bus and the ground, and each capacitor bank (41) is also connected to the test control module (5).

7. The overvoltage suppression capability test circuit of the arc suppression device according to claim 6, characterized in that, Each of the capacitor banks (41) includes a second contactor and three capacitors with the same capacitance value; The second contactor includes a second excitation coil and three second normally open contact circuits. The second excitation coil is connected to the test control module (5). The first end of the three second normally open contact circuits is connected one-to-one to the three phases of the three-phase bus, and the second end of the three second normally open contact circuits is connected one-to-one to ground via the three capacitors.

8. The overvoltage suppression capability test circuit of the arc suppression device according to claim 7, characterized in that, The number of capacitor banks (41) is 6.

9. The overvoltage suppression capability test circuit of the arc suppression device according to any one of claims 1 to 8, characterized in that, Also includes: The result output module (7) is connected to the analog quantity measurement module (6) and is used to receive the grounding point fault voltage and output the overvoltage capability value.

10. A device for testing the overvoltage suppression capability of an arc-suppressing device, characterized in that, Includes the overvoltage suppression capability test circuit of the arc suppression device as described in any one of claims 1 to 9.

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