CN114355082B - Series compensation device MOV explosion-proof performance test system and method - Google Patents
Series compensation device MOV explosion-proof performance test system and method Download PDFInfo
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- CN114355082B CN114355082B CN202111602733.9A CN202111602733A CN114355082B CN 114355082 B CN114355082 B CN 114355082B CN 202111602733 A CN202111602733 A CN 202111602733A CN 114355082 B CN114355082 B CN 114355082B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
A series compensation device MOV explosion-proof performance test system and method comprises an industrial personal computer, a test device in communication connection with the industrial personal computer, wherein the test device comprises a short-circuit current branch, a discharge current branch, a test object branch and a direct-current charging power supply branch which are connected in parallel, the test object branch comprises an MOV short-circuit test object, the short-circuit current branch comprises an alternating-current generator and a current limiting inductor and is used for inputting short-circuit current to the test object branch by utilizing the alternating-current generator and the current limiting inductor, the discharge current branch comprises a discharge capacitor and a wave regulating inductor and is used for inputting discharge current to the test object branch by utilizing the discharge capacitor and the wave regulating inductor, the direct-current charging power supply branch comprises a direct-current charging power supply and is used for charging the discharge capacitor, and the industrial personal computer is used for controlling the operation of the direct-current charging power supply to obtain the current of the MOV short-circuit test object and generating a current waveform chart according to the current. The invention achieves the most severe checking effect and realizes effective checking of the explosion-proof performance of the MOV.
Description
Technical Field
The invention relates to a series compensation device MOV explosion-proof performance test system and a series compensation device MOV explosion-proof performance test method.
Background
The series compensation device has the advantages of improving the transmission capacity of the transmission line, enhancing the stability of the system and the like, and in recent years, the series compensation device is applied to a plurality of high-voltage and long-distance transmission lines in China. Series capacitor banks are the core component of series compensation devices, typically employing metal oxide voltage limiters (MOVs) as protection devices for the capacitor banks. When the series compensation line is in fault, the MOV is required to absorb energy generated by short-circuit current while limiting overvoltage of the capacitor bank under the line fault, so that the design energy of the MOV is large, and is generally tens of MJ. Because of the large energy absorption capacity, MOV units generally adopt a multi-column parallel structure, and the whole group of MOVs is formed by connecting a plurality of MOV units in parallel. When a resistor column in a certain MOV unit is damped or the resistor is deteriorated, the shunt of the whole group of MOVs is uneven during short-circuit faults, and the defective MOV unit can flow more short-circuit current to cause MOV breakdown, so that the pressure release of the voltage limiter is triggered, and the series compensation device is forced to stop running.
At present, the porcelain jacket is adopted for the other series compensation devices MOV except for the composite jacket MOV adopted for individual series compensation. The explosion-proof design performance of the MOV porcelain jacket is tested by the requirements of the 8.10 th section short circuit test of GB/T11032-2020 AC gapless metal oxide arrester. It is prescribed that the MOV should withstand a discharge current of about 110kA at a power frequency of 63kA/0.2s and not undergo a explosive explosion of the porcelain jacket in the event of a short circuit test (also referred to as a pressure release test). However, the test working conditions only consider the influence of short-circuit current, but do not consider the influence of discharge current of the capacitor bank. Even if the MOV passes the national standard requirement type test, the ceramic jacket can generate crushing explosion under the condition of breakdown failure of the MOV. Therefore, a new test method is needed to reliably check the explosion-proof performance of the MOV.
Disclosure of Invention
Aiming at the problems existing in the prior art, the main purpose of the embodiment of the invention is to provide a series compensation device MOV explosion-proof performance test system and method, which can effectively check the MOV explosion-proof performance.
In order to achieve the above purpose, the embodiment of the invention provides a series compensation device MOV explosion-proof performance test system, which comprises an industrial personal computer and a test device, wherein the test device is in communication connection with the industrial personal computer;
The test device comprises a short-circuit current branch, a discharge current branch, a sample branch and a direct-current charging power supply branch, wherein the short-circuit current branch, the discharge current branch, the sample branch and the direct-current charging power supply branch are connected in parallel, and the sample branch comprises an MOV short-circuit sample;
The short-circuit current branch comprises an alternating current generator and a current limiting inductor, and is used for obtaining preset short-circuit current by utilizing the alternating current generator and the current limiting inductor and inputting the short-circuit current to the sample branch;
the discharging current branch circuit comprises a discharging capacitor and a wave-regulating inductor, and is used for obtaining preset discharging current by utilizing the discharging capacitor and the wave-regulating inductor and inputting the discharging current to the sample branch circuit;
The direct-current charging power supply branch circuit comprises a direct-current charging power supply, and is used for charging the discharging capacitor;
the industrial personal computer is used for controlling the running of the direct-current charging power supply, obtaining the current of the MOV short-circuit test sample and generating a current waveform chart according to the current, wherein the current waveform chart is used for MOV explosion-proof performance analysis.
Optionally, in an embodiment of the present invention, the short-circuit current branch further includes a first switch, and the first switch is connected in series with the alternator and the current limiting inductor.
Optionally, in an embodiment of the present invention, the discharging current branch further includes a second switch, and the second switch is connected in series with the discharging capacitor and the tuning inductance.
Optionally, in an embodiment of the present invention, the industrial personal computer is further configured to control the second switch to be closed when the short-circuit current reaches a peak value.
Optionally, in an embodiment of the present invention, the dc charging power supply branch further includes a third switch and a fourth switch, where the third switch is connected in series with the dc charging power supply, and the fourth switch is connected in parallel with the dc charging power supply.
Optionally, in an embodiment of the present invention, the discharging current branch further includes a voltage measurement device, and the voltage measurement device is connected in parallel with the discharging capacitor and is used for collecting a voltage value of the discharging capacitor.
Optionally, in an embodiment of the present invention, the industrial personal computer is further configured to receive a voltage value collected by the voltage measurement device, and when the voltage value reaches a preset full power threshold, control the third switch to be turned off.
Optionally, in an embodiment of the present invention, the industrial personal computer is further configured to control the first switch and the second switch to be opened and control the fourth switch to be closed when the voltage value reaches a preset discharge threshold.
Optionally, in an embodiment of the present invention, the test sample branch further includes an ammeter, where the ammeter is connected in series with the MOV short-circuit test sample, and the ammeter is used for collecting an electric current of the MOV short-circuit test sample.
The embodiment of the invention also provides a method for testing the explosion-proof performance of the series compensation device MOV, which comprises the following steps:
controlling a direct current charging power supply in a direct current charging power supply branch of the testing device to charge a discharge capacitor in a discharge current branch until the voltage value of the discharge capacitor reaches a preset full-charge threshold;
Controlling the first switch to be closed so that the short-circuit current in the short-circuit current branch of the testing device is input to the sample branch of the testing device;
When the short-circuit current reaches a peak value, controlling a second switch to be closed so that the discharging current in the discharging current branch is input into the test sample branch, and collecting the current of the MOV short-circuit test sample in the test sample branch in real time through an ammeter;
When the voltage value of the discharging capacitor reaches a preset discharging threshold value, the first switch and the second switch are controlled to be disconnected, and a current waveform diagram is generated according to the obtained current of the MOV short-circuit test sample, wherein the current waveform diagram is used for MOV explosion-proof performance analysis.
Optionally, in an embodiment of the present invention, the method further includes controlling a fourth switch connected in parallel with the dc charging source to be turned on when the voltage value of the discharging capacitor reaches a preset discharging threshold.
Optionally, in an embodiment of the present invention, the method further includes controlling a third switch connected in series with the dc charging power supply to be turned on, so that the dc charging power supply charges a discharging capacitor, and controlling the third switch to be turned off after a voltage value of the discharging capacitor reaches a preset full-charge threshold.
Optionally, in an embodiment of the present invention, the method further comprises obtaining a voltage value of the discharge capacitor by a voltage measurement device connected in parallel with the discharge capacitor.
According to the invention, the power frequency current is generated through the alternating current generator, the circuit short-circuit current is simulated by combining the current-limiting inductor, the high-frequency discharge loop is formed through the discharge capacitor and the wave-regulating inductor, the discharge current of the series compensation capacitor is simulated, and the MOV test sample which is set to be short-circuited is discharged through connecting the short-circuit current branch and the discharge current branch in parallel, so that the most severe checking effect is achieved, and the effective checking of the explosion-proof performance of the MOV is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a series compensation device MOV explosion-proof performance test system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of MOV current flow at fault in an embodiment of the present invention;
fig. 3 is a flowchart of a method for testing the explosion-proof performance of an MOV of a serial compensation device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a series compensation device MOV explosion-proof performance test system and method.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to the electrical schematic diagram of the series compensation device in the system when the fault occurs, as shown in fig. 2, the series compensation capacitor and the MOV are in parallel connection. When a short circuit fault occurs in an MOV, the internal current flowing through the MOV will be the superposition of the line current I L and the capacitor discharge current I C, wherein the capacitor C1 discharge current I C is a high frequency current of high magnitude (hundreds of kA), high frequency (several kHz) and fast decay (several milliseconds), and the pressure generated in the MOV under this current is much greater than the pressure generated by the line current I L. Therefore, in order to effectively check the explosion-proof performance of the MOV, a capacitive discharge current needs to be applied to the MOV, which is also deficient in the current short-circuit test.
Fig. 1 is a schematic structural diagram of an explosion-proof performance test system for a serial compensation device MOV according to an embodiment of the invention, wherein the system comprises an industrial personal computer and a test device in communication connection with the industrial personal computer.
The test device comprises a short-circuit current branch 1, a discharge current branch 3, a test article branch 2 and a direct current charging power supply branch 4, wherein the short-circuit current branch 1, the discharge current branch 3, the test article branch 2 and the direct current charging power supply branch 4 are connected in parallel, and the test article branch 2 comprises an MOV short-circuit test article, namely the test article in fig. 1.
The short-circuit current branch 1 comprises an alternating current generator and a current limiting inductor L1, wherein the short-circuit current branch 1 is used for obtaining preset short-circuit current by utilizing the alternating current generator and the current limiting inductor, and inputting the short-circuit current to the sample branch 2, and the alternating current generator is connected with the current limiting inductor L1 in series.
The discharging current branch 3 comprises a discharging capacitor C and a wave-regulating inductor L2, and is used for obtaining preset discharging current by utilizing the discharging capacitor and the wave-regulating inductor and inputting the discharging current to the sample branch 2, wherein the discharging capacitor and the wave-regulating inductor are connected in series.
The direct-current charging power supply branch circuit comprises a direct-current charging power supply and is used for charging the discharging capacitor.
The industrial personal computer is used for controlling the running of the direct-current charging power supply, obtaining the current of the MOV short-circuit test sample and generating a current waveform chart according to the current, wherein the current waveform chart is used for analyzing the explosion-proof performance of the MOV.
In this embodiment, the testing device includes a test product MOV, an alternator, a first switch S1, a current limiting inductor L1, an ammeter a, a second switch S2 for controlling a closing time, a tuning inductor L2 with an adjustable inductance value, a discharge capacitor C with an adjustable capacitance value, a voltage measurement device V (e.g. a voltmeter), a third switch S3, a fourth switch S4, and a dc charging power supply. In fig. 1, solid lines represent electrical connections, broken lines represent signal transmission, and arrows represent signal transmission directions. The system specifically comprises an alternating current generating loop formed by an alternating current generator and a current limiting inductor, wherein a power frequency alternating current is injected into an MOV test sample to simulate a short circuit current I L flowing through the MOV when a ground fault occurs in the line, an adjustable capacitor C is used for simulating a series compensation capacitor, the oscillation frequency of a capacitor discharging current is changed by a wave adjusting inductor L, so that the discharging current I C of the series compensation capacitor to the MOV when the fault occurs is simulated, and the two loops are in a parallel connection relationship, so that the power frequency current and the capacitor bank discharging current simultaneously flow in the MOV to check the explosion-proof performance of the MOV.
As an embodiment of the invention, the short-circuit current branch further comprises a first switch connected in series with the alternator, the current limiting inductance.
In this embodiment, the discharging current branch further includes a second switch, and the second switch is connected in series with the discharging capacitor and the tuning inductance.
In this embodiment, the industrial personal computer is further configured to control the second switch to be closed when the short-circuit current reaches a peak value.
In this embodiment, the dc charging power supply branch further includes a third switch and a fourth switch, where the third switch is connected in series with the dc charging power supply, and the fourth switch is connected in parallel with the dc charging power supply.
In this embodiment, the discharging current branch further includes a voltage measurement device connected in parallel with the discharging capacitor, for collecting a voltage value of the discharging capacitor.
In this embodiment, the industrial personal computer is further configured to receive a voltage value collected by the voltage measurement device, and when the voltage value reaches a preset full power threshold, control the third switch to be turned off.
In this embodiment, the industrial personal computer is further configured to control the first switch and the second switch to be opened and control the fourth switch to be closed when the voltage value reaches a preset discharge threshold.
As an embodiment of the invention, the test piece branch further comprises an ammeter, wherein the ammeter is connected in series with the MOV short-circuit test piece and is used for collecting the current of the MOV short-circuit test piece.
By utilizing the structure of the system, the specific testing process of the system comprises the following steps:
1) And arranging fuses inside the MOV according to national standard requirements of GB/T11032-2020 to form a test product. In this case, the sample may be considered as a short circuit state in the electrical circuit.
2) The current limiting inductance L1, l1=u AC/IL is adjusted according to the short-circuit current I L of the line in which the MOV to be tested is located.
The value of the short-circuit current I L is determined by the actual short-circuit impedance of the power system at the line where the series compensation device is installed, and the value of U AC is 80kA at the maximum, or may be set according to actual needs.
3) The capacitance value of the discharge capacitor C is adjusted according to the capacitor capacity of the serial compensation where the MOV is located, and the tuning inductance L2, L2=1/f 2 C is adjusted according to the required oscillation frequency f.
The capacity value of the series compensation capacitor is one of rated parameters of the series compensation device, can be determined by designing the series compensation device, has a capacity range of about hundreds of mu F, and can be set according to actual needs. The required oscillation frequency f is determined from the past experience value when the actual fault occurred, about 3000Hz.
4) And setting the charging voltage U DC of the direct-current charging power supply through the industrial personal computer according to the rated voltage and the protection level of the series compensation device, combining the switch S3 to charge the capacitor C, and pulling the switch S3 after the charging is finished according to the voltage measured by the voltage measuring equipment V.
The difference between the voltage at two ends of the capacitor, which is measured by the voltage measuring equipment, and the set charging voltage U DC is within 1%, and the voltage reaches the stability, and the charging is considered to be finished.
5) The industrial personal computer controls the switch S1 to inject power frequency alternating current into the sample.
6) The switching-on time is controlled by the industrial personal computer, specifically, the switching-in switch S2 can be controlled before and after the power frequency current reaches the peak value, and the capacitor high-frequency discharge current is injected into the sample.
7) After the test, the switches S1 and S2 are opened, the switch S4 is closed, and the switch S3 is closed again to discharge the capacitor C.
When the voltage across the capacitor C is close to 0 and is stable, the test is considered to be ended.
8) And closing the alternating current generator, checking the state of the sample, retaining the current waveform of the MOV flowing in the current test, measuring the current through the ammeter A, and transmitting the current to the industrial personal computer for storage.
The test sample state refers to the integrity of the MOV jacket, and the test sample state can determine whether the explosion-proof performance of the test sample meets the application requirements. If the fire is good or collapsed, the fire is accepted as qualified, and if the fire is splashed or ignited, the fire is accepted as unqualified.
Furthermore, the current waveform can be used for the subsequent simulation calculation of the internal gas pressure of the jacket, the determination of the pressure distribution, the improvement of the jacket structure and the like.
According to the invention, the power frequency current is generated by the alternating current generator to simulate the short-circuit current of a circuit, the high-frequency discharging loop is formed by the adjustable capacitor and the adjustable inductor to simulate the discharging current of the series compensation capacitor, the two loops are in parallel connection, and the capacitor discharging current is overlapped at the peak value of the power frequency current through the switch with controllable closing time, so that the most severe examination effect is achieved.
According to the invention, the power frequency current is generated through the alternating current generator, the short-circuit current of the circuit is simulated by combining the current-limiting inductor, the high-frequency discharge loop is formed by the discharge capacitor and the wave-regulating inductor, the discharge current of the series compensation capacitor is simulated, the discharge current of the capacitor is ensured to be overlapped at the peak value of the power frequency current through connecting the short-circuit current branch and the discharge current branch in parallel, and the most severe checking effect is achieved, so that the explosion-proof performance of the MOV is effectively checked.
Fig. 3 is a flowchart illustrating a method for testing the explosion-proof performance of a serial compensation device MOV according to an embodiment of the present invention, where an execution body of the method for testing the explosion-proof performance of a serial compensation device MOV includes, but is not limited to, an industrial personal computer, and the method illustrated in the figure includes:
step S1, a direct current charging power supply in a direct current charging power supply branch of a testing device is controlled to charge a discharge capacitor in a discharge current branch until the voltage value of the discharge capacitor reaches a preset full-charge threshold;
s2, controlling the first switch to be closed so that the short-circuit current in the short-circuit current branch of the testing device is input into the sample branch of the testing device;
step S3, when the short-circuit current reaches a peak value, a second switch is controlled to be closed, so that the discharge current in the discharge current branch is input to the sample branch, and the current of the MOV short-circuit sample in the sample branch is collected in real time through an ammeter;
and S4, when the voltage value of the discharge capacitor reaches a preset discharge threshold, controlling the first switch and the second switch to be disconnected, and generating a current waveform chart according to the acquired current of the MOV short-circuit test sample, wherein the current waveform chart is used for MOV explosion-proof performance analysis.
As an embodiment of the invention, the method further comprises controlling a fourth switch connected in parallel with the dc charging source to be closed when the voltage value of the discharge capacitor reaches a preset discharge threshold.
The method further comprises the steps of controlling a third switch connected in series with the direct-current charging power supply to be closed so that the direct-current charging power supply charges a discharging capacitor, and controlling the third switch to be opened after the voltage value of the discharging capacitor reaches a preset full-power threshold.
As an embodiment of the invention the method further comprises obtaining the voltage value of the discharge capacitor by means of a voltage measuring device connected in parallel with the discharge capacitor.
Based on the same application conception as the series compensation device MOV explosion-proof performance test system, the invention also provides a series compensation device MOV explosion-proof performance test method. Because the principle of the series compensation device MOV explosion-proof performance testing method for solving the problem is similar to that of the series compensation device MOV explosion-proof performance testing system, the implementation of the series compensation device MOV explosion-proof performance testing method can refer to the implementation of the series compensation device MOV explosion-proof performance testing system, and repeated parts are not repeated.
According to the invention, the power frequency current is generated through the alternating current generator, the short-circuit current of the circuit is simulated by combining the current-limiting inductor, the high-frequency discharge loop is formed by the discharge capacitor and the wave-regulating inductor, the discharge current of the series compensation capacitor is simulated, the discharge current of the capacitor is ensured to be overlapped at the peak value of the power frequency current through connecting the short-circuit current branch and the discharge current branch in parallel, and the most severe checking effect is achieved, so that the explosion-proof performance of the MOV is effectively checked.
While the principles and embodiments of the present invention have been described in detail in the foregoing application of the principles and embodiments of the present invention, the above examples are provided for the purpose of aiding in the understanding of the principles and concepts of the present invention and may be varied in many ways by those of ordinary skill in the art in light of the teachings of the present invention, and the above descriptions should not be construed as limiting the invention.
Claims (13)
1. The system is characterized by comprising an industrial personal computer and a testing device which is in communication connection with the industrial personal computer;
The test device comprises a short-circuit current branch, a discharge current branch, a sample branch and a direct-current charging power supply branch, wherein the short-circuit current branch, the discharge current branch, the sample branch and the direct-current charging power supply branch are connected in parallel, and the sample branch comprises an MOV short-circuit sample;
The short-circuit current branch comprises an alternating current generator and a current limiting inductor, and is used for obtaining preset short-circuit current by utilizing the alternating current generator and the current limiting inductor and inputting the short-circuit current to the sample branch;
the discharging current branch circuit comprises a discharging capacitor and a wave-regulating inductor, and is used for obtaining preset discharging current by utilizing the discharging capacitor and the wave-regulating inductor and inputting the discharging current to the sample branch circuit;
The direct-current charging power supply branch circuit comprises a direct-current charging power supply, and is used for charging the discharging capacitor;
the industrial personal computer is used for controlling the running of the direct-current charging power supply, obtaining the current of the MOV short-circuit test sample and generating a current waveform chart according to the current, wherein the current waveform chart is used for MOV explosion-proof performance analysis.
2. The system of claim 1, wherein the short circuit current branch further comprises a first switch connected in series with the alternator, current limiting inductor.
3. The system of claim 2, wherein the discharge current leg further comprises a second switch connected in series with the discharge capacitor, the tuning inductance.
4. The system of claim 3, wherein the industrial personal computer is further configured to control the second switch to close when the short circuit current reaches a peak value.
5. The system of claim 3, wherein the dc charging power supply branch further comprises a third switch and a fourth switch, the third switch connected in series with the dc charging power supply, the fourth switch connected in parallel with the dc charging power supply.
6. The system of claim 5, wherein the discharge current branch further comprises a voltage measurement device connected in parallel with the discharge capacitor for collecting a voltage value of the discharge capacitor.
7. The system of claim 6, wherein the industrial personal computer is further configured to receive a voltage value collected by the voltage measurement device, and to control the third switch to be turned off when the voltage value reaches a preset full power threshold.
8. The system of claim 7, wherein the industrial personal computer is further configured to control the first switch to be opened from the second switch and control the fourth switch to be closed when the voltage value reaches a preset discharge threshold.
9. The system of claim 1, wherein the test sample branch further comprises an ammeter connected in series with the MOV short-circuit test sample, the ammeter for collecting an electrical current of the MOV short-circuit test sample.
10. The method for testing the explosion-proof performance of the MOV of the series compensation device is characterized by comprising the following steps of:
controlling a direct current charging power supply in a direct current charging power supply branch of the testing device to charge a discharge capacitor in a discharge current branch until the voltage value of the discharge capacitor reaches a preset full-charge threshold;
Controlling the first switch to be closed so that the short-circuit current in the short-circuit current branch of the testing device is input to the sample branch of the testing device;
When the short-circuit current reaches a peak value, controlling a second switch to be closed so that the discharging current in the discharging current branch is input into the test sample branch, and collecting the current of the MOV short-circuit test sample in the test sample branch in real time through an ammeter;
When the voltage value of the discharging capacitor reaches a preset discharging threshold value, the first switch and the second switch are controlled to be disconnected, and a current waveform diagram is generated according to the obtained current of the MOV short-circuit test sample, wherein the current waveform diagram is used for MOV explosion-proof performance analysis.
11. The method of claim 10, further comprising controlling a fourth switch connected in parallel with the DC charging source to close when the voltage value of the discharge capacitor reaches a preset discharge threshold.
12. The method of claim 10, further comprising controlling a third switch in series with the DC charging source to be closed to charge the DC charging source to a discharge capacitor, and controlling the third switch to be opened after the voltage value of the discharge capacitor reaches a preset full power threshold.
13. The method of claim 10, further comprising obtaining a voltage value of the discharge capacitor by a voltage measurement device in parallel with the discharge capacitor.
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| CN103675624A (en) * | 2013-12-13 | 2014-03-26 | 中国西电电气股份有限公司 | Power-frequency voltage testing device and testing method of lightning arrester |
| CN113791317A (en) * | 2021-08-30 | 2021-12-14 | 中国南方电网有限责任公司超高压输电公司南宁局 | Metal oxide variable resistance test circuit, system and method |
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| US20070159760A1 (en) * | 2005-05-13 | 2007-07-12 | Collins Clark | Methods and Systems Related to Pulsed Power |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675624A (en) * | 2013-12-13 | 2014-03-26 | 中国西电电气股份有限公司 | Power-frequency voltage testing device and testing method of lightning arrester |
| CN113791317A (en) * | 2021-08-30 | 2021-12-14 | 中国南方电网有限责任公司超高压输电公司南宁局 | Metal oxide variable resistance test circuit, system and method |
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| CN114355082A (en) | 2022-04-15 |
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