Circuit and device for testing performance of arc extinguishing device

Abstract

The utility model relates to a circuit and a device for testing the performance of an arc-extinguishing device. The circuit comprises an isolation voltage transformation unit used for being connected with a low-voltage power supply and outputting a high-voltage power supply; the low-harmonic filtering unit is connected with the isolation transformation unit and is used for filtering low-order harmonics in the high-voltage power supply; the high-harmonic filtering unit is connected with the isolation transformation unit and used for filtering higher harmonics in the high-voltage power supply; a ground fault simulation unit which is connected with the isolation transformation unit and is used for simulating a ground fault; the current control unit is connected with the isolation voltage transformation unit and is used for controlling the magnitude of the output current of the isolation voltage transformation unit; the arc extinguishing device connection unit is connected with the isolation transformation unit and is used for accessing an arc extinguishing device to be tested; and the current measuring unit is used for being coupled with the to-be-tested arc extinguishing device so as to measure the compensation current of the to-be-tested arc extinguishing device. The device can accurately test whether the performance of the arc extinguishing device meets the standard or not, and the test credibility is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power plant equipment technical field especially, relates to a kind of arc extinguishing device performance test circuit and device. BACKGROUND

[0002] In the distribution network of nuclear power plant, the adaptability of arc extinguishing device is particularly important to power safety, therefore, before arc extinguishing device is installed to distribution network, the parameter of arc extinguishing device is determined according to the actual parameter of distribution network (including the output voltage, output current etc. of distribution network) or by special testing device, to realize selection type. Since special testing device is not real distribution network, some arc extinguishing devices tested are installed to site, and cannot meet the use demand. For example, to improve power supply reliability and stability, filter that can filter out harmonic is connected in output bus in reality distribution network, and existing special testing device does not configure corresponding filter (especially high harmonic), ignores the influence of high harmonic on arc extinguishing device, leading to the difference between test working condition and actual working condition of distribution network, finally makes test credibility reduce. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide an arc extinguishing device performance test circuit and device.

[0004] The technical scheme adopted by the utility model to solve its technical problem is: a kind of arc extinguishing device performance test circuit is constructed, including:

[0005] Isolation transformer unit for connecting low-voltage power supply and outputting high-voltage power supply;

[0006] Low harmonic filter unit connected with the isolation transformer unit for filtering low harmonic in the high-voltage power supply;

[0007] High harmonic filter unit connected with the isolation transformer unit for filtering high harmonic in the high-voltage power supply;

[0008] Ground fault simulation unit connected with the isolation transformer unit for simulating ground fault;

[0009] Current control unit connected with the isolation transformer unit for controlling the output current size of the isolation transformer unit;

[0010] Arc extinguishing device connection unit connected with the isolation transformer unit for connecting arc extinguishing device to be tested;And

[0011] Current measurement unit for coupling with the arc extinguishing device to be tested to measure compensation current of the arc extinguishing device to be tested.

[0012] In some embodiments, the high harmonic filter unit includes:

[0013] a third harmonic filter unit connected with the isolation transformer unit for filtering third harmonic in the high-voltage power supply; and

[0014] a fifth harmonic filter unit connected with the isolation transformer unit for filtering fifth harmonic in the high-voltage power supply.

[0015] In some embodiments, the third harmonic filter unit comprises three first LC filters, each of which is connected with one of the three phase lines on the high-voltage side of the isolation transformer unit.

[0016] The fifth harmonic filter unit comprises three second LC filters, each of which is connected with one of the three phase lines on the high-voltage side of the isolation transformer unit.

[0017] In some embodiments, each of the first LC filters comprises a first inductor L1 and a first capacitor C1; one end of the first inductor L1 is connected with one of the phase lines on the high-voltage side of the isolation transformer unit, and the other end of the first inductor L1 is grounded through the first capacitor C1.

[0018] Each of the second LC filters comprises a second inductor L2 and a second capacitor C2; one end of the second inductor L2 is connected with one of the phase lines on the high-voltage side of the isolation transformer unit, and the other end of the second inductor L2 is grounded through the second capacitor C2.

[0019] In some embodiments, the capacitance of the first capacitor C1 is not less than 50 microfarad.

[0020] The capacitance of the second capacitor C2 is not less than 20 microfarad.

[0021] In some embodiments, the isolation transformer unit comprises a first contactor KM1 and an isolation transformer GLB; the first end of the first contactor KM1 is connected with the low-voltage power supply, the second end of the first contactor KM1 is connected with the low-voltage side of the isolation transformer GLB, and the high-voltage side of the isolation transformer GLB is connected with the low-harmonic filter unit, the high-harmonic filter unit, the ground fault simulation unit, the current control unit, and the arc-extinguishing device connection unit.

[0022] In some embodiments, the low-harmonic filter unit comprises a fourth contactor KM4, a first voltage transformer PT1, and an arc-extinguishing module R1; the first end of the fourth contactor KM4 is connected with the isolation transformer unit, the second end of the fourth contactor KM4 is connected with the primary side of the first voltage transformer PT1, and the secondary side of the first voltage transformer PT1 is connected with the arc-extinguishing module R1.

[0023] In some embodiments, the current control unit includes a plurality of capacitor components, each capacitor component including a third contactor KM3 and three third capacitors C3; wherein, the third contactor KM3 includes three contact loops, the input terminals of the three contact loops are respectively connected one-to-one to the three phase lines of the high-voltage side of the isolation transformer unit, and the output terminals of the three contact loops are respectively grounded one-to-one through the three third capacitors C3.

[0024] In some embodiments, the arc suppression device connection unit includes a grounding transformer JDB and a fifth contactor KM5. The high-voltage side of the grounding transformer JDB is connected to the isolation transformer unit, and the grounding terminal of the grounding transformer JDB is connected to the arc suppression device to be tested via the fifth contactor KM5.

[0025] In addition, this utility model also constructs a performance testing device for arc extinguishing devices, including the arc extinguishing device performance testing circuit described above.

[0026] The present invention provides the following beneficial effects: it provides a performance testing device for arc suppression devices, which fully considers the influence of harmonics on the test, can more realistically simulate the actual working conditions of the power distribution network, can accurately test whether the performance of the arc suppression device meets the standards, has high test reliability, and plays a positive role in improving the safety and reliability of nuclear power plants. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0028] Figure 1 This is a circuit diagram of the arc suppression device performance testing circuit in one embodiment of this utility model. Detailed Implementation

[0029] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] Figure 1 This is a circuit diagram of a performance testing circuit for an arc-suppression device according to one embodiment of this utility model. This performance testing circuit is used in nuclear power plants to help personnel test whether the performance of arc-suppression devices installed on a 6.3kV power supply network meets standards. Please refer to [link / reference]. Figure 1 The performance test circuit of the arc suppression device includes an isolation transformer unit 1, a low harmonic filter unit 2, a high harmonic filter unit 3, a ground fault simulation unit 4, a current control unit 5, an arc suppression device connection unit 6, and a current measurement unit 7.

[0031] The isolation transformer unit 1 is used to connect to a low-voltage power supply and output a high-voltage power supply. Specifically, the low-voltage power supply can be provided by mains power, a generator, or other power modules, and can be a three-phase power supply of 360V to 440V. The isolation transformer unit 1 can step up the 360V to 440V AC power supply to obtain a three-phase power supply of approximately 6.3kV.

[0032] Please see Figure 1 In one embodiment, the isolation transformer unit 1 includes a first contactor KM1 and an isolation transformer GLB. The first end of the first contactor KM1 is connected to a low-voltage power supply, and the second end of the first contactor KM1 is connected to the low-voltage side of the isolation transformer GLB. The high-voltage side of the isolation transformer GLB is connected to a low-harmonic filter unit 2, a high-harmonic filter unit 3, a ground fault simulation unit 4, a current control unit 5, and an arc suppression device connection unit 6. Specifically, the first contactor KM1 can be an existing three-phase AC contactor. The first end of the first contactor KM1 includes three input terminals, which are respectively used to connect to the three phase lines of the low-voltage power supply. The second end of the first contactor KM1 includes three output terminals, which are respectively connected to the three phase lines of the low-voltage side of the isolation transformer GLB (equivalent to the isolation transformer GLB being connected to a low-voltage power supply). Correspondingly, the isolation transformer GLB can be an existing isolation transformer, and the high-voltage side of the isolation transformer GLB is used to output high-voltage power.

[0033] The low-harmonic filter unit 2 is connected to the isolation transformer unit 1. The low-harmonic filter unit 2 is used to filter out low-order harmonics (mainly second harmonics) in the high-voltage power supply to improve the stability of the high-voltage power supply.

[0034] Please see Figure 1 In one embodiment, the low-harmonic filtering unit 2 includes a fourth contactor KM4, a first voltage transformer PT1, and a harmonic suppression module R1. The first terminal of the fourth contactor KM4 is connected to the isolation transformer unit 1, the second terminal of the fourth contactor KM4 is connected to the primary side of the first voltage transformer PT1, and the secondary side of the first voltage transformer PT1 is connected to the harmonic suppression module R1. Specifically, the fourth contactor KM4 can be an existing three-phase AC contactor (the structure of the fourth contactor KM4 is the same as that of the first contactor KM1). The three input terminals of the fourth contactor KM4 are respectively connected to the three phase lines of the low-voltage side of the isolation transformer GLB, and the three output terminals of the fourth contactor KM4 are connected to the primary side of the first voltage transformer PT1. Furthermore, the harmonic suppression module R1 can include an existing harmonic suppression resistor or a secondary harmonic suppressor. Understandably, in this embodiment, the harmonic suppression module R1 is coupled to the high-voltage side of the isolation transformer unit 1 through the first voltage transformer PT1, thereby suppressing the second harmonic in the high-voltage power supply.

[0035] The high harmonic filter unit 3 is connected to the isolation transformer unit 1. The high harmonic filter unit 3 is used to filter out high-order harmonics in the high-voltage power supply.

[0036] In one embodiment, the high harmonic filtering unit 3 includes a third harmonic filtering unit and a fifth harmonic filtering unit.

[0037] The third harmonic filter unit is connected to isolation transformer unit 1. The third harmonic filter unit is used to filter out the third harmonic in the high-voltage power supply. For details, please refer to [link to relevant documentation]. Figure 1 The third harmonic filtering unit may include three first LC filters 31, which are connected one-to-one to the three phase lines on the high-voltage side of the isolation transformer unit 1.

[0038] More specifically, each first LC filter 31 may include a first inductor L1 and a first capacitor C1. One end of the first inductor L1 is connected to one phase line of the high-voltage side of the isolation transformer unit 1, and the other end of the first inductor L1 is grounded through the first capacitor C1. It should be noted that... Figure 1 In the diagram, L1A, L1B, and L1C all belong to the first inductor L1. The difference is that inductor L1A is connected to phase A of the high-voltage side of isolation transformer GLB, inductor L1B is connected to phase B of the high-voltage side of isolation transformer GLB, and inductor L1C is connected to phase C of the high-voltage side of isolation transformer GLB. Similarly, Figure 1 C1A, C1B, and C1C all belong to the first capacitor C1. The difference is that capacitor C1A acts on phase A of the high-voltage side of the isolation transformer GLB, capacitor C1B acts on phase B of the high-voltage side of the isolation transformer GLB, and capacitor C1C acts on phase C of the high-voltage side of the isolation transformer GLB.

[0039] Optionally, the capacitance of the first capacitor C1 is not less than 50 microfarads, and preferably 75 microfarads. The inductance of the first inductor L1 can be calculated using the following formula: L1 ′ =K / (9*ω) 2 *C1 ′ L1 ′ This represents the inductance value of the first inductor L1, ω represents the angular frequency of the high-voltage power supply, and C1 ′ This indicates the capacitance value of the first capacitor, C1.

[0040] The fifth harmonic filter unit is connected to the isolation transformer unit 1. The fifth harmonic filter unit is used to filter out the fifth harmonic in the high-voltage power supply. For details, please refer to [link to relevant documentation]. Figure 1 The fifth harmonic filtering unit may include three second LC filters 32, which are connected one-to-one to the three phase lines on the high-voltage side of the isolation transformer unit 1.

[0041] More specifically, each second LC filter 32 may include a second inductor L2 and a second capacitor C2. One end of the second inductor L2 is connected to one phase line of the high-voltage side of the isolation transformer unit 1, and the other end of the second inductor L2 is grounded through the second capacitor C2. It should be noted that... Figure 1 L2A, L2B, and L2C in the second LC filter 32 all belong to the second inductor L2, and C2A, C2B, and C2C all belong to the second capacitor C2. The labeling rules for each capacitor and inductor in the second LC filter 32 are consistent with the labeling rules for the first LC filter 31, which can be referred to above and will not be repeated here.

[0042] Optionally, the capacitance of the second capacitor C2 is not less than 20 microfarads, and preferably 30 microfarads. The inductance of the second inductor L2 can be calculated using the following formula: L2 ′ =K / (25*ω) 2 *C2 ′ L2 ′ This represents the inductance value of the second inductor L2, ω represents the angular frequency of the high-voltage power supply, and C2... ′ This indicates the capacitance value of the second capacitor, C2.

[0043] Understandably, by adjusting the capacitance and inductance of the first LC filter 31 and the second LC filter 32, the third harmonic filtering unit and the fifth harmonic filtering unit can filter out harmonics of different frequencies, thereby achieving the filtering out of the third and fifth harmonics in the high-voltage power supply. Furthermore, by adjusting the parameters of the first inductor L1, the first capacitor C1, the second inductor L2, and the second capacitor C2, the operator can make the output waveform of the high-voltage power supply as close as possible to the output waveform of the actual power distribution network where the arc suppression device to be tested will be installed.

[0044] Ground fault simulation unit 4 is connected to isolation transformer unit 1, and is used to simulate ground faults. For details, please refer to [link to relevant documentation]. Figure 1 The ground fault simulation unit 4 may include a second contactor KM2 and a fault simulator G1. The fault simulator G1 is connected to one of the phase lines on the high-voltage side of the isolation transformer GLB via the second contactor KM2. The fault simulator G1 can be an adjustable resistor. When a ground fault needs to be simulated, the operator can operate the second contactor KM2 to close, thereby grounding one of the phase lines on the high-voltage side of the isolation transformer GLB through the fault simulator G1, thus simulating a single-phase ground fault. Furthermore, the operator can adjust the resistance value of the adjustable resistor as needed to control the severity of the single-phase ground fault.

[0045] In order to monitor the real-time operating conditions of the ground fault simulation unit 4, such as Figure 1As shown, in one embodiment, the ground fault simulation unit 4 further includes a first ammeter CT1 and a voltmeter V1. The first ammeter CT1 is coupled to the grounding wire of the fault simulator G1 to measure the ground fault current and display its magnitude. The voltmeter V1 is connected across the fault simulator G1 to measure the ground fault voltage and display its magnitude.

[0046] The current control unit 5 is connected to the isolation transformer unit 1. The current control unit 5 is used to control the output current of the isolation transformer unit 1 (i.e., to control the output current of the high-voltage side of the isolation transformer GLB).

[0047] Please see Figure 1 In one embodiment, the current control unit 5 includes several capacitor components 51. Each capacitor component 51 includes a third contactor KM3 and three third capacitors C3. The third contactor KM3 includes three contact loops, with the input terminals of each loop connected one-to-one to the three phase lines of the high-voltage side of the isolation transformer unit 1, and the output terminals of each loop grounded one-to-one via the three third capacitors C3. In this embodiment, each third capacitor C3 acts as a load, and the capacitance value of the third capacitors C3 in each capacitor component 51 is the same. The capacitance values ​​of the third capacitors C3 in different capacitor components 51 may be the same or different. Operators can operate some or all of the third contactors KM3 in the capacitor components 51 to simultaneously close or open, thereby controlling the output current of the isolation transformer unit 1.

[0048] To facilitate monitoring of the output current of the isolation transformer unit 1, the current control unit 5 may further include three second ammeters CT2. Specifically, as shown... Figure 1 As shown, in each capacitor assembly 51, all third capacitors C3 connected to phase A (via third contactor KM3) will be grounded via the first grounding wire after connection. Similarly, all third capacitors C3 connected to phase B will be grounded via the second grounding wire after connection, and all third capacitors C3 connected to phase C will be grounded via the third grounding wire after connection. Correspondingly, the three second ammeters CT2 are coupled one-to-one with the first grounding wire, the second grounding wire, and the third grounding wire, respectively, to measure and display the current magnitude of phase A, phase B, and phase C.

[0049] Arc extinguishing device connection unit 6 is connected to isolation transformer unit 1. Arc extinguishing device connection unit 6 is used to connect the arc extinguishing device to be tested.

[0050] Please see Figure 1In one embodiment, the arc suppression device connection unit 6 includes a grounding transformer JDB and a fifth contactor KM5. The high-voltage side of the grounding transformer JDB is connected to the isolation transformer unit 1, and the grounding terminal of the grounding transformer JDB is connected to the arc suppression device to be tested via the fifth contactor KM5.

[0051] The current measuring unit 7 is used to couple with the arc suppression device under test to measure the magnitude of the compensation current of the arc suppression device under test. Specifically, the current measuring unit 7 may include a third ammeter, which is coupled to the grounding wire of the arc suppression device under test to measure and display the magnitude of the compensation current.

[0052] The working principle of this utility model is as follows: First, the arc-suppression device to be tested is connected through the arc-suppression device connection unit; then, a high-voltage power supply with a voltage value of approximately 6.3kV is output through the isolation transformer unit, isolated from the isolation power supply (i.e., the low-voltage power supply); next, the output current of the isolation transformer unit (i.e., the current of the high-voltage power supply) is adjusted by the current control unit to make the output power of the high-voltage power supply similar to the actual output power of the 6.3kV distribution network; next, the low-order and high-order harmonics in the high-voltage power supply are filtered by the low-harmonic filtering unit and the high-harmonic filtering unit to make the operating conditions of the high-voltage power supply closer to the actual operating conditions of the distribution network; next, a ground fault simulation unit simulates a ground fault to form the test conditions for the arc-suppression device; finally, the compensation current of the arc-suppression device to be tested is measured by the current measuring unit, allowing the operator to evaluate whether the performance of the arc-suppression device meets the standards through the compensation current. Understandably, compared with the prior art, this utility model fully considers the impact of harmonics on the test, can more realistically simulate the actual working conditions of the power distribution network, can more accurately test whether the performance of the arc suppression device meets the standards, improves the reliability of the test, and plays a positive role in improving the safety and reliability of nuclear power plants.

[0053] In addition, this utility model also provides a performance testing device for arc extinguishing devices, including the performance testing circuit for arc extinguishing devices provided in the embodiments of this utility model.

[0054] 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. An arc suppression device performance testing circuit, comprising: Comprise: an isolation transformer unit (1) for connecting a low-voltage power supply and outputting a high-voltage power supply; a low-harmonic filter unit (2) connected with the isolation transformer unit (1) for filtering low-order harmonics in the high-voltage power supply; a high-harmonic filter unit (3) connected with the isolation transformer unit (1) for filtering high-order harmonics in the high-voltage power supply; a ground fault simulation unit (4) connected with the isolation transformer unit (1) for simulating a ground fault; a current control unit (5) connected with the isolation transformer unit (1) for controlling the output current size of the isolation transformer unit (1); an arc-extinguishing device connection unit (6) connected with the isolation transformer unit (1) for connecting an arc-extinguishing device to be tested; and a current measurement unit (7) for coupling with the arc-extinguishing device to be tested to measure the compensation current of the arc-extinguishing device to be tested.

2. The arc suppression device performance testing circuit of claim 1, wherein, The high-harmonic filter unit (3) comprises: a third harmonic filter unit connected with the isolation transformer unit (1) for filtering third harmonics in the high-voltage power supply; and a fifth harmonic filter unit connected with the isolation transformer unit (1) for filtering fifth harmonics in the high-voltage power supply.

3. The arc suppression device performance testing circuit of claim 2, wherein, The third harmonic filter unit comprises three first LC filters (31), each of which is connected one-to-one to one of the three phase lines on the high-voltage side of the isolation transformer unit (1); The fifth harmonic filter unit comprises three second LC filters (32), each of which is connected one-to-one to one of the three phase lines on the high-voltage side of the isolation transformer unit (1).

4. The arc suppression device performance testing circuit of claim 3, wherein, Each of the first LC filters (31) comprises a first inductor L1 and a first capacitor C1; one end of the first inductor L1 is connected to one of the phase lines on the high-voltage side of the isolation transformer unit (1), and the other end of the first inductor L1 is grounded through the first capacitor C1; Each of the second LC filters (32) comprises a second inductor L2 and a second capacitor C2; one end of the second inductor L2 is connected to one of the phase lines on the high-voltage side of the isolation transformer unit (1), and the other end of the second inductor L2 is grounded through the second capacitor C2.

5. The arc suppression device performance testing circuit of claim 4, wherein, The capacitance of the first capacitor C1 is not less than 50 microfarads; The capacitance of the second capacitor C2 is not less than 20 microfarads.

6. The arc suppression device performance testing circuit of any one of claims 1 to 5, wherein, The isolation transformer unit (1) comprises a first contactor KM1 and an isolation transformer GLB; the first end of the first contactor KM1 is used to connect the low-voltage power supply, the second end of the first contactor KM1 is connected to the low-voltage side of the isolation transformer GLB, and the high-voltage side of the isolation transformer GLB is connected to the low-harmonic filter unit (2), the high-harmonic filter unit (3), the ground fault simulation unit (4), the current control unit (5), and the arc-extinguishing device connection unit (6).

7. The arc suppression device performance testing circuit of any one of claims 1 to 5, wherein, The low harmonic filter unit (2) comprises a fourth contactor KM4, a first voltage transformer PT1 and a harmonic elimination module R1; a first end of the fourth contactor KM4 is connected to the isolation transformer unit (1), a second end of the fourth contactor KM4 is connected to a primary side of the first voltage transformer PT1, a secondary side of the first voltage transformer PT1 is connected to the harmonic elimination module R1.

8. The arc suppression device performance testing circuit of any one of claims 1 to 5, wherein, The current control unit (5) comprises a plurality of capacitor assemblies (51), each of the capacitor assemblies (51) comprises a third contactor KM3 and three third capacitors C3; wherein the third contactor KM3 comprises three contact loops, input ends of the three contact loops are connected to three phase lines of the high voltage side of the isolation transformer unit (1) one by one, output ends of the three contact loops are connected to ground through the three third capacitors C3 one by one.

9. The arc suppression device performance testing circuit of any one of claims 1 to 5, wherein, The arc-extinguishing device connection unit (6) comprises a grounding transformer JDB and a fifth contactor KM5, a high voltage side of the grounding transformer JDB is connected to the isolation transformer unit (1), a grounding end of the grounding transformer JDB is connected to the to-be-tested arc-extinguishing device through the fifth contactor KM5.

10. An arc suppression device performance testing apparatus, characterized by, An arc-extinguishing device performance test circuit comprising the arc-extinguishing device performance test circuit according to any one of claims 1 to 9.

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