CN211014546U - Inside arcing tolerance test return circuit of direct current high speed switch - Google Patents
Inside arcing tolerance test return circuit of direct current high speed switch Download PDFInfo
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- CN211014546U CN211014546U CN201921074815.9U CN201921074815U CN211014546U CN 211014546 U CN211014546 U CN 211014546U CN 201921074815 U CN201921074815 U CN 201921074815U CN 211014546 U CN211014546 U CN 211014546U
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Abstract
The utility model discloses an internal arcing tolerance test loop of a direct-current high-speed switch, which comprises a short circuit loop, a rectification loop and an arcing monitoring loop; wherein: the short circuit loop comprises a short circuit auxiliary breaker, an alternating current power supply and a short circuit transformer; the alternating current power supply, the short-circuit auxiliary circuit breaker and the short-circuit transformer primary coil are sequentially connected in series to form a loop; the rectification loop comprises a first ammeter, a rectification valve group, a reactor, a rectification auxiliary circuit breaker and a current-limiting resistor. The internal combustion of the DC high-speed switch can be equivalently simulated under the synergistic action of the short circuit loop, the rectifier loop and the arcing monitoring loopArc tolerance test scenario, through equivalent simulation loop, at breaker SF6And under the rated air pressure, the ablation performance of the system load direct current endured by the circuit breaker due to misoperation and sneak jump in the system running state is verified.
Description
Technical Field
The utility model relates to a test circuit, concretely relates to inside arcing of direct current high speed switch tolerates test circuit.
Background
A High Speed Switch (HSS) is mainly applied to a multi-terminal flexible dc power transmission system. The purpose of configuring the direct-current high-speed switch is to realize on-line switching of a third station of the direct-current system and high-speed isolation of direct-current line faults, and improve the reliability and the availability of the whole direct-current system.
The direct current high-speed switch generally adopts open column type circuit breaker type, and operating device can adopt hydraulic pressure or spring, in order to cooperate the coordinated control of many end systems, realizes sending end, receiving end's online input and withdraw from, and the cooperation requirement to equipment key performance parameter is very high, mainly has following characteristics:
(1) should possess an inherent long-term overload capability (at maximum ring temperature) of not less than 1.05p.u. system rated delivery capacity;
(2) the direct current arc burning tolerance is strong;
(3) the capacity of transferring the DC line idle charging current is provided;
(4) the brake-separating device has the advantages of high brake-separating speed, reliable mechanical action characteristic and no action rejection or misoperation.
The operation conditions of the direct-current high-speed switch mainly comprise 4 processes of stable closing, transient opening and transient closing. Under 4 operating conditions encountered by the HSS, the following capabilities are required:
1. under the HSS switching-off state, the converter stations on two sides of the fracture are unlocked, the direct current voltages on two sides reach the rated direct current voltage and are stable, and the HSS can be reliably switched on.
2. In an HSS closing state, a converter station on one fracture side is closed, the direct-current voltage on the closing side is kept unchanged at the beginning, the HSS should be reliably opened, the voltage of the closing side to the ground is gradually reduced due to discharge of polar line PT resistors and the like, and therefore the HSS should be capable of enduring the gradually increased voltage between terminals before a matched isolating knife of a high-speed switch is opened.
3. When a direct-current line has a fault, the HSS power supply converter station quickly shifts phase, the HSS load side converter station quickly locks, and before HSS brake-off action, instantaneous heavy current of about 100ms needs to be borne, and the amplitude reaches dozens of kA. The HSS is gated off after the current decays to 0.
4. The short-time internal arcing tolerance is achieved, if the short-time internal arcing tolerance is achieved in the soft and straight engineering of Udongde, the short-time internal arcing tolerance is 3125A, 400ms and 5 times, the cloud and precious interconnection engineering is 3786A, 400ms and 5 times, and the insulating outer sleeve is not damaged after five times of arcing.
5. The HSS needs to have reliable mechanical properties for high-speed switching on and off. For example, in the Wudongde project, the closing time is required to be less than 100ms, and the opening time is required to be less than 30 ms.
6. The HSS does not need to have the capability to switch off dc or fault currents. However, the capability of breaking the residual current of the dc line is required, and is generally about 20A.
Therefore, before the HSS is applied, the overall key performance, particularly the DC arcing tolerance, needs to be tested and evaluated, but no test and evaluation method for the DC arcing tolerance is available at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide an inside arcing tolerant test return circuit of direct current high speed switch to before using HSS, test HSS, with judge whether its direct current arcing tolerant ability meets the requirements
In order to achieve the above purpose, the technical scheme of the utility model is that:
an internal arcing tolerance test loop of a direct-current high-speed switch comprises a short circuit loop, a rectification loop and an arcing monitoring loop; wherein:
the short circuit loop comprises a short circuit auxiliary breaker, an alternating current power supply and a short circuit transformer; the alternating current power supply, the short-circuit auxiliary circuit breaker and the short-circuit transformer primary coil are sequentially connected in series to form a loop;
the rectification loop comprises a first ammeter, a rectification valve group, a reactor, a rectification auxiliary circuit breaker and a current-limiting resistor; the rectifier valve group is connected with a secondary coil of the short-circuit transformer, and the first ammeter is installed on a coil connected with the rectifier valve and the secondary coil of the short-circuit transformer; one end of the current-limiting resistor is connected with the input end of the rectifier valve group, and the other end of the current-limiting resistor is connected with one end of the auxiliary rectifier circuit breaker; one end of the reactor is connected with the output end of the rectifier valve group;
the arcing monitoring loop comprises a first voltmeter, a second ammeter and a characteristic parameter comprehensive monitoring device; the other end of the rectification auxiliary circuit breaker is used for being connected with a tested circuit breaker; the characteristic parameter comprehensive monitoring device is used for monitoring the tested circuit breaker to obtain parameters required by the test; one end of the second ammeter is connected with the other end of the current-limiting resistor, and the other end of the second ammeter is respectively connected with the tested circuit breaker and grounded; one end of the first voltmeter is connected to a line connected with the second ammeter and the tested circuit breaker, and the other end of the first voltmeter is grounded; and one end of the second voltmeter is connected to a line connected with the rectification auxiliary circuit breaker and the tested circuit breaker, and the other end of the second voltmeter is grounded.
The rectifier valve group consists of a bridge type converter valve consisting of controllable converter arms and is set to be 6 pulses or 12 pulses.
The comprehensive characteristic parameter monitoring device is used for monitoring the tested circuit breaker and comprises the following components:
monitoring mechanical characteristics to obtain time-contact speed and time-contact travel curves when the tested breaker T0 is opened;
infrared monitoring is carried out to obtain the change condition of the temperature rise of the surface of the arc extinguish chamber caused by the fact that the tested circuit breaker is subjected to thermal radiation during arcing;
and monitoring gas components, and acquiring the processes of SF6 gas component generation and evolution in the process of the internal arcing tolerance of the tested circuit breaker.
The alternating current power supply is an alternating current generator.
The reactor is a dry reactor.
Compared with the prior art, the utility model, its beneficial effect lies in:
under the synergistic action of the short circuit loop, the rectifier loop and the arcing monitoring loop, the scene of the arcing tolerance test in the DC high-speed switch can be equivalently simulated, and through the equivalent simulation loop, the circuit breaker SF6And under the rated air pressure, the ablation performance of the system load direct current endured by the circuit breaker due to misoperation and sneak jump in the system running state is verified.
Drawings
Fig. 1 is a schematic circuit diagram of an internal arcing tolerance test loop of a dc high-speed switch according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for evaluating an ablation state of a contact of an arc extinguishing chamber of a circuit breaker;
FIG. 3 is a schematic diagram of infrared monitoring of the arc chute;
FIG. 4 is a schematic diagram of a temperature rise evaluation process.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example (b):
referring to fig. 1, the internal arcing tolerance test loop of the dc high-speed switch provided in this embodiment mainly includes three loops: short-circuit 100, rectifier circuit 200, arcing monitoring circuit 300.
The short circuit 100 includes an auxiliary breaker AB2, an alternator G, and a short-circuit transformer T, and the primary coils of the alternator G, the short-circuit auxiliary breaker AB2, and the short-circuit transformer T are connected in series in sequence to form a circuit.
The rectifying circuit 200 comprises a first ammeter A1, a rectifying valve group V, a dry reactor L, an auxiliary rectifying circuit breaker AB1 and a current-limiting resistor R, wherein the rectifying valve group V is connected with a secondary coil of the short-circuit transformer T, the first ammeter A1 is installed on a coil connected with the rectifying valve V and the secondary coil of the short-circuit transformer T, one end of the current-limiting resistor R is connected with an input end of the rectifying valve group V, the other end of the current-limiting resistor R is connected with one end of the auxiliary rectifying circuit breaker AB1, and one end of the reactor L is connected with an output end of the rectifying valve group V.
The arcing monitoring circuit 300 comprises a first voltmeter V1, a second voltmeter V2, a second ammeter a2 and a characteristic parameter comprehensive monitoring device 30; the other end of the rectification auxiliary breaker AB1 is used for being connected with a tested breaker T0; the comprehensive characteristic parameter monitoring device 30 is used for monitoring the tested circuit breaker T0 to obtain parameters required by the test; one end of the second ammeter A2 is connected with the other end of the current-limiting resistor R, and the other end of the second ammeter A2 is respectively connected with the tested circuit breaker T0 and grounded; one end of the first voltmeter V1 is connected with a line connected with the second ammeter A2 and the tested circuit breaker T0, and the other end is grounded; one end of the second voltmeter V2 is connected to a line connecting the rectification auxiliary breaker AB1 and the tested breaker T0, and the other end is grounded.
Under the synergistic action of the short circuit loop, the rectifier loop and the arcing monitoring loop, the scene of the arcing tolerance test in the DC high-speed switch can be equivalently simulated, and through the equivalent simulation loop, the circuit breaker SF6And under the rated air pressure, the ablation performance of the system load direct current endured by the circuit breaker due to misoperation and sneak jump in the system running state is verified.
In the test loop, a test sample (namely, a tested breaker T0) starts to be opened from a closing position, and a direct current arc I flows between the arc contacts of the test sampledc(the specific amplitude value is based on the calculation value of the most severe fault working condition of the specific engineering, and is generally in the range of 3000-;
duration of tac(the specific time is based on the specific engineering flexible straight valve protection locking time setting value, generally within the range of 300 and 500 ms);
and (4) carrying out n times of arc-burning-resistant tests, wherein the specific times are formulated according to the requirements of engineering on the electrical service life of the equipment.
In the initial state, the tested breaker T0 is in the closed state, and the auxiliary breakers AB1 and AB2 are in the open state.
Parameter deviation requirement: DC amplitude IdcDeviation from engineering requirement is +/-10%, and duration time can not exceed 0.5s, Idc 2the deviation of t is 0 to 10%.
In particular, the bridge converter valve V, which consists of a controllable converter arm, of the rectifier valve group V can be set to 6 pulses or 12 pulses. The comprehensive characteristic parameter monitoring device is used for monitoring the tested circuit breaker and comprises the following steps:
monitoring mechanical characteristics to obtain time-contact speed and time-contact travel curves when the tested breaker T0 is opened;
infrared monitoring is carried out to obtain the change condition of the temperature rise of the surface of the arc extinguish chamber caused by the fact that the tested circuit breaker is subjected to thermal radiation during arcing;
and monitoring gas components, and acquiring the processes of SF6 gas component generation and evolution in the process of the internal arcing tolerance of the tested circuit breaker.
Correspondingly, the embodiment also provides a method for testing the internal arcing tolerance of the direct-current high-speed switch, which is performed by adopting the test loop and comprises the following steps:
1) configuring test loop parameters
According to the required value of the test current and the rated voltage of the generator, the transformation ratio of the short-circuit transformer is adjusted, and then the dry-type reactor in the rectifying test loop is adjusted to enable the test sample side to generate the direct current amplitude IdcThe short-circuit current of (1).
2) Generating short-circuit current
Before the test loop is short-circuited, the test article is in a switching-on position. After the test is started, the auxiliary circuit breaker AB2 is switched on to short the loop, the short-circuit current is amplified along with the turn ratio of the coil through the short-circuit transformer T to generate the short-circuit current required by the test, the short-circuit current is input into a rectifier valve of a rectifier loop, and the current amplitude is recorded in real time through an ammeter A1.
3) Rectifying current
In the rectifying circuit, a bridge type converter valve V consisting of controllable converter arms can be set to be 6 pulses or 12 pulses, and alternating short-circuit current is rectified by the converter valve and then is assistedThe circuit breaker AB1 is switched on, direct current is output, and the current amplitude I meeting the test requirement is generated after the direct current is regulated by the dry type reactor L and the current limiting resistor Rdc。
4) Arcing test and condition monitoring
In an arcing monitoring loop, when rated direct current flows through a tested breaker T0, the tested breaker T0 is controlled to be opened, direct current arcs are generated between arc contacts along with rapid relative opening movement of the contacts, and after the contacts are opened in place, the direct current arcs are continuously ablated between the arc contacts, so that the test required time T is keptacThen, the auxiliary breaker AB2 breaks the ac short circuit, and the power supply is cut off, so that the arc of the T0 arc contact of the circuit breaker under test is gradually reduced and finally extinguished. By this time, one test was completed. And (4) carrying out n times of tests according to test required values, wherein the test interval is based on the time required for the temperature of the test sample to return to the ambient temperature, so that personal injury is avoided.
In the test process, key parameters such as dynamic resistance, gas component evolution, switching-on and switching-off speed, infrared temperature rise of the arc extinguish chamber and the like are respectively recorded, and whether the performance of the tested circuit breaker meets the requirements or not is analyzed according to the parameters.
Specifically, the dynamic resistor includes 4 key characteristic parameters, and is specifically defined as follows:
1) the effective contact state of the arc contact is as follows: in the switching-on and switching-off process of the circuit breaker, when the contact resistance of the arc contact is less than or equal to a certain threshold value (the value can be given by referring to the measured value of the dynamic contact resistance), the arc contact is considered to belong to an effective contact state, and when the contact resistance is greater than the value, the arc contact is considered to belong to an ineffective contact state and is in a separation state (not absolute separation, but for convenience of data analysis). The test current reaches more than 2000A in the dynamic resistance test, a transient arc discharge phenomenon can occur when the arc contact metal is absolutely separated, and the moment of the contact absolute separation is inaccurate when the contact resistance is infinite through the test means, so that a certain threshold value is defined as the contact edge value of the arc contact, and the trend analysis of test data is only convenient.
2) Effective contact displacement L (mm) is the contact displacement corresponding to the arc contact resistance less than or equal to the threshold value (2000 mu omega) just after the separation of the main contact in the opening and closing process of the circuit breaker, and is called the effective contact displacement.
3) Cumulative contact resistance Raccu(μ Ω mm): and the effective contact displacement corresponds to the accumulated value of the contact resistance at the sampling moment. The sampling rate of the tester is 20k, namely, the corresponding contact resistance value is obtained every 0.05ms, and the contact resistance in the effective contact displacement curve range is integrated to obtain the accumulated contact resistance mu omega mm.
4) Average contact resistance Rave(μ Ω/mm): the accumulated contact resistance is divided by the effective contact displacement to obtain the average contact resistance mu omega/mm, and the change conditions of the contact resistance and the effective contact displacement after the contact is ablated can be better reflected.
The dynamic resistance of the arc contact of the circuit breaker is measured before and after the arcing test and at each test interval, the characteristic parameters of the ablation state of the arc contact are recorded, the arc ablation resistance degree of the arc contact is evaluated, and the following table is recorded.
When the effective contact displacement L of the arcing contact is in the interval of 0-5 mm, the average contact resistance is in a rapid descending trend along with the increase of the effective contact displacement, and the change of the average contact resistance gradually becomes stable after the contact displacement is larger than 5 mm.
Before and after the arc withstand test, the dimensional length and weight changes of the arc contact should be recorded.
Disassembling the test prototype, measuring the port sizes and the part weights of the movable arc contact and the static arc contact;
weight change before and after the test (unit: g)
Dimensional change of contact before and after test (unit: mm)
The method for evaluating the ablation state of the contact of the arc extinguish chamber of the circuit breaker is specifically shown in FIG. 2 and comprises the following steps:
the first step is as follows: the user draws circuit breaker explosion chamber characteristic parameter through dynamic resistance test technique, inputs evaluation system, and the input data includes:
1) to-be-evaluated breaker ledger information: the circuit breaker scheduling number, phase difference, voltage grade, circuit breaker model, manufacturer and commissioning time;
2) the initial characteristic parameters of the circuit breaker are that the effective contact displacement of the arc contact is L (mm), and the cumulative contact resistance R of the arc contactaccu(μ Ω mm); average contact resistance R of arc contactave(μΩ/mm)；
3) Characteristic parameters of the current state of the circuit breaker to be evaluated comprise the effective contact displacement L (mm) of the arc contact and the accumulated contact resistance R of the arc contactaccu(μ Ω mm); average contact resistance R of arc contactave(μΩ/mm)；
The second step is that: and comprehensively evaluating the characteristic parameters of the initial state and the current state of the circuit breaker to be evaluated, which are input in the first step, based on a database (an accumulated energy ablation fingerprint database, a contact characteristic parameter association database and a contact ablation state expert database) to respectively obtain the quantitative difference of the accumulated opening and closing energy and the characteristic quantity association curve corresponding to the current ablation state of the arc contact.
The third step: and based on the result of the second step of comprehensive analysis, completing the calculation of characteristic parameters, and judging the ratio interval of the effective contact displacement of the current arc contact of the circuit breaker and the initial effective contact displacement.
The fourth step: evaluating the current state of the arc extinguish chamber of the circuit breaker, wherein the current state belongs to a normal ablation state if the ratio of the effective contact displacement of the current arc contact to the initial effective contact displacement is within the range of 80-100%; if the ratio is in the range of 60-80%, the ablation state is slight; if the ratio is in the range of 40-60%, the ablation state is moderate; if the ratio is within the range of 20-40%, the ablation is in a severe ablation state; if the ratio is in the range of < 20%, belonging to abnormal state;
in the process of carrying out internal arcing test on the circuit breaker, the arc extinguish chamber SF is subjected to6Evolution trends such as generation and growth of various characteristic components of the gas are recorded, and the data can be used as an important overhauling basis for operation of the circuit breaker of the type and an important index for evaluating the ablation degree of a nozzle of the circuit breaker.
For the on-off speed monitoring of the tested circuit breaker, a conventional speed sensor can be adopted and installed on a crank arm of an operating mechanism of the circuit breaker, and when the tested circuit breaker T0 is in on-off action, the data of the on-off speed v-time T-action stroke l are transmitted to a characteristic parameter comprehensive monitoring device in real time for comprehensive processing, so that the measurement of mechanical characteristics can be completed.
When the tested circuit breaker T0 is used for carrying out an internal arcing tolerance test, as the arc contact continuously resists the ablation of the arc tarc, the temperature rise of the arc is radiated to the insulating outer sleeve of the arc extinguish chamber through insulating gas heat, the temperature rise change of K on the surface of the arc extinguish chamber can be caused, therefore, in the test process, an infrared monitoring device is adopted based on the infrared radiation temperature measurement technology, the temperature rise change of the insulating outer sleeve of the arc extinguish chamber of the circuit breaker is monitored in real time, and data is transmitted to the characteristic parameter comprehensive monitoring device for comprehensive analysis and evaluation. The temperature rise test data in the type test is used as an important state evaluation basis after operation.
The circuit breaker is provided with two arc-extinguishing chambers, the temperature measuring point of each arc-extinguishing chamber is respectively arranged at the upper layer, the lower layer, the left, the middle and the right positions are 6 points, and the circuit breaker is specifically shown in figure 3.
After completion of the temperature measurement, the temperature rise (K) data was recorded as follows:
the temperature rise evaluation process is shown in fig. 4 and includes:
1. in the process of carrying out the withstand arcing test of the circuit breaker, the temperature of an insulating outer sleeve of the arc extinguish chamber is monitored by infrared, temperature rise tests are carried out according to the principle that points are distributed on the upper layer, the lower layer, the left layer, the middle layer and the right layer, the temperature rise of each point is recorded as T2, variance root processing is carried out on scattered point temperature rise of the arc extinguish chamber, and the mean value T1 is obtained.
2. And (4) judging whether the temperature rise of the local overheating arc-extinguishing chamber exceeds the average value T1max, if not, normally evaluating, and if so, performing the next evaluation.
3. And carrying out inversion calculation on the actually measured outer sleeve temperature rise according to the temperature rise of the normally arcing tolerant lower current conductor to obtain a current-carrying conductor temperature rise calculated value.
4. And whether the scattering point test value of the outer sleeve of the arc extinguish chamber exceeds a first limit value T2max1, if so, evaluating that the current-carrying conductor of the arc extinguish chamber is in abnormal contact, and if not, carrying out next evaluation.
5. Whether the scattering point test value of the outer sleeve of the arc extinguish chamber exceeds a first limit value T2max2 or not is judged, if yes, the current-carrying conductor of the arc extinguish chamber is judged to be contacted to reach an attention value, other auxiliary evaluation means are adopted, and if not, temperature rise evaluation is finished.
According to the test requirement value, the circuit breaker T0 to be tested is subjected to n times of internal arcing tolerance, and in the test process, the circuit breaker T0 to be tested does not generate obvious external effect, namely, the test article cannot explode and cannot generate holes or cracks on the shell, so that the circuit breaker T0 meets the requirement of the internal arcing tolerance performance.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (6)
1. An internal arcing tolerance test loop of a direct-current high-speed switch is characterized by comprising a short circuit loop, a rectifying loop and an arcing monitoring loop; wherein:
the short circuit loop comprises a short circuit auxiliary breaker, an alternating current power supply and a short circuit transformer; the alternating current power supply, the short-circuit auxiliary circuit breaker and the short-circuit transformer primary coil are sequentially connected in series to form a loop;
the rectification loop comprises a first ammeter, a rectification valve group, a reactor, a rectification auxiliary circuit breaker and a current-limiting resistor; the rectifier valve group is connected with a secondary coil of the short-circuit transformer, and the first ammeter is installed on a coil connected with the rectifier valve and the secondary coil of the short-circuit transformer; one end of the current-limiting resistor is connected with the input end of the rectifier valve group, and the other end of the current-limiting resistor is connected with one end of the auxiliary rectifier circuit breaker; one end of the reactor is connected with the output end of the rectifier valve group;
the arcing monitoring loop comprises a first voltmeter, a second ammeter and a characteristic parameter comprehensive monitoring device; the other end of the rectification auxiliary circuit breaker is used for being connected with a tested circuit breaker; the characteristic parameter comprehensive monitoring device is used for monitoring the tested circuit breaker to obtain parameters required by the test; one end of the second ammeter is connected with the other end of the current-limiting resistor, and the other end of the second ammeter is respectively connected with the tested circuit breaker and grounded; one end of the first voltmeter is connected to a line connected with the second ammeter and the tested circuit breaker, and the other end of the first voltmeter is grounded; and one end of the second voltmeter is connected to a line connected with the rectification auxiliary circuit breaker and the tested circuit breaker, and the other end of the second voltmeter is grounded.
2. The internal arcing tolerance test circuit of claim 1, wherein the arcing monitoring circuit further comprises a comprehensive characteristic parameter monitoring device, and the comprehensive characteristic parameter monitoring device is used for monitoring the circuit breaker to be tested to obtain parameters required by the test.
3. The internal arcing tolerance test circuit of claim 1, wherein the rectifier valve set is composed of bridge converter valves composed of controllable converter arms and is set to be 6 pulses or 12 pulses.
4. The internal arcing tolerance test circuit of claim 1, wherein the integrated characteristic parameter monitoring device for monitoring the circuit breaker under test comprises:
monitoring mechanical characteristics to obtain time-contact speed and time-contact travel curves when the tested breaker T0 is opened;
infrared monitoring is carried out to obtain the change condition of the temperature rise of the surface of the arc extinguish chamber caused by the fact that the tested circuit breaker is subjected to thermal radiation during arcing;
and monitoring gas components, and acquiring the processes of SF6 gas component generation and evolution in the process of the internal arcing tolerance of the tested circuit breaker.
5. The internal arcing tolerance test circuit of claim 1, wherein said ac power source is an ac generator.
6. The internal arcing tolerance test circuit of claim 1, wherein the reactor is a dry reactor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110376513A (en) * | 2019-07-10 | 2019-10-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of DC high-speed switch inside arcing resistance test circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110376513A (en) * | 2019-07-10 | 2019-10-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of DC high-speed switch inside arcing resistance test circuit |
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