CN212622935U - Power distribution network circuit breaker series resonance voltage withstand device for power supply of electric automobile - Google Patents
Power distribution network circuit breaker series resonance voltage withstand device for power supply of electric automobile Download PDFInfo
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Abstract
The utility model belongs to the technical field of the high-voltage electrical test, especially, relate to a distribution network circuit breaker series resonance pressure resistant device of electric automobile power supply. The power output of the electric automobile is connected with a variable frequency power module, and the variable frequency power module is connected with the primary side of an excitation transformer; one end of the secondary side of the exciting transformer is grounded, and the other end of the secondary side of the exciting transformer is connected with the input end of the reactor in series; the output end of the reactor is connected with the input end of the high-voltage arm of the capacitive voltage divider and the input end of the tested circuit breaker through a pure copper coaxial cable and a copper core at the same time; the coaxial cable capacitor is the capacitor existing in the cable; the grounding end of the capacitive voltage divider module is grounded through a shielding layer of a coaxial cable, and the shell or the grounding end of the tested circuit breaker is grounded through the shielding layer of the coaxial cable; the variable frequency power supply module is connected with the handheld wireless controller in a wireless communication mode and wirelessly controlled. The problem of the high voltage circuit breaker alternating current withstand voltage test on the distribution network post be difficult to obtain the power is solved, effectively prevent the mistake of harmonic peak value to the sample and wear, promote test efficiency.
Description
Technical Field
The utility model belongs to the technical field of the high-voltage electrical test, especially, relate to a distribution network circuit breaker series resonance pressure resistant device of electric automobile power supply.
Background
In the operation of electrical equipment, the insulation is gradually degraded by the action of electric field, temperature and mechanical vibration for a long time, wherein the degradation includes overall degradation and partial degradation, and defects are formed. The alternating current withstand voltage test is the most effective and direct method for identifying the insulation strength of the power equipment and is an important content of preventive tests. In addition, since the ac withstand voltage test voltage is generally higher than the operating voltage, the equipment has a large safety margin after passing the test, and therefore the ac withstand voltage test is an important means for ensuring the safe operation of the power equipment.
At present, the on-site high-voltage electrical equipment alternating-current voltage withstand test device commonly used in China mainly performs equipment test on high-voltage equipment of 66kV or more. When an alternating-current withstand voltage test is carried out on equipment such as a high-voltage circuit breaker on a 10kV distribution network on-site column, the practical problems that on-site power supply is difficult, test equipment is huge and the like exist, and the equipment cannot be smoothly carried out. And the manual control is adopted, so that the safety is low and the like.
At present, no series resonance voltage-withstanding device of a power distribution network circuit breaker for electric automobile power supply exists in China.
Disclosure of Invention
To the problem that exists among the above-mentioned prior art, the utility model provides a distribution network circuit breaker series resonance pressure resistant device of electric automobile power supply. The alternating-current withstand voltage test device aims to solve the problems that on-site power supply taking difficulty exists in an alternating-current withstand voltage test of equipment such as a 10kV distribution network line on-site high-voltage circuit breaker, corresponding units cannot be selected according to the capacity of a specific tested circuit breaker, the equipment is heavy, needs a crane to be installed, and is inconvenient to carry, low in safety and the like.
The utility model provides a technical scheme that its technical problem adopted is:
a series resonance voltage-withstanding device of a power distribution network breaker for power supply of an electric automobile is characterized in that the output of an electric automobile power supply is connected with a variable frequency power supply module, and the variable frequency power supply module is connected with the primary side of an excitation transformer; one end of the secondary side of the exciting transformer is grounded, and the other end of the secondary side of the exciting transformer is connected with the input end of the reactor in series; the output end of the reactor is connected with the input end of a high-voltage arm of the capacitive voltage divider and the input end of the tested circuit breaker through a pure copper coaxial cable, and a copper core of the reactor is simultaneously connected with the input end of the high-voltage arm of the capacitive voltage divider and the input end of the tested circuit breaker; the coaxial cable capacitor is the capacitor existing in the cable; the grounding end of the capacitive voltage divider is grounded through a shielding layer of the coaxial cable, and the shell or the grounding end of the tested circuit breaker is grounded through the shielding layer of the coaxial cable; the variable frequency power supply module is connected with the handheld wireless controller in a wireless communication mode.
The power output of the electric automobile is connected with the variable-frequency power module through two pure copper storage batteries in a live wire mode, and the variable-frequency power module is connected with the primary side of the exciting transformer through two pure copper storage batteries in a live wire mode; one end of the secondary side of the exciting transformer is grounded, and the other end of the secondary side of the exciting transformer is connected with the input end of the reactor in series through a pure copper wire; the output end of the reactor is connected with the input end of a high-voltage arm of the capacitive voltage divider and the three input ends of u, v and w of the tested circuit breaker through a pure copper coaxial cable, and a copper core of the reactor is simultaneously connected with the input end of the high-voltage arm of the capacitive voltage divider and the three input ends of the u, v and w of the tested circuit; the coaxial cable capacitor is the capacitor of two cables in the pure copper coaxial cable; the U, V, W, N four output terminals of the tested circuit breaker 7 are grounded through the shielding layer of the coaxial cable.
And the power supply output of the electric automobile provides a working power supply for the whole machine.
The variable frequency power supply module controls the handheld wireless controller in a wireless communication way; the variable frequency power supply module and the handheld wireless controller both adopt Zigbee wireless communication technology.
The variable frequency power supply module outputs sinusoidal alternating currents with different amplitudes and frequencies.
Two pure copper storage batteries of the variable frequency power supply module are connected to a low-voltage primary input end of the exciting transformer by lapping a live wire, after the pure copper storage batteries are boosted and isolated by the exciting transformer, a secondary output end of the exciting transformer is connected with the reactor in series through a copper wire and is connected with the led-out capacitive voltage divider, the cable capacitor and the tested circuit breaker in parallel.
The variable frequency power supply module is connected with an asynchronous communication port of the microprocessor through a wireless transceiving module, and the key control is connected with an external interrupt A of the microprocessor; the TFT display screen is connected with a PortA port of the microprocessor; the voltage sampling is connected with an AD0 conversion port of the microprocessor, and the current sampling is connected with an AD1 conversion port of the microprocessor; the overcurrent protection is connected with an external interrupt B of the microprocessor, the level conversion module is respectively connected with output ports of PWM0, PWM1, PWM2 and PWM3 of the microprocessor, and the IGBT bridge is connected with the level conversion module; the LC filter circuit is connected with the IGBT bridge, and all the modules are integrated on one circuit board.
The wireless transceiver module adopts a near field wireless communication module based on a Zigbee wireless technology to interact with the handheld wireless controller;
the key control adopts a matrix type sixteen-point key control, and the working mode is as follows: a full-automatic mode, a manual mode, an automatic tuning manual boosting mode;
the TFT display screen is composed of a large-screen color screen liquid crystal;
and the voltage sampling and the overcurrent protection are simultaneously connected with an AD conversion port of the microprocessor.
The level conversion module is composed of two IR2113 type MOS full-bridge driving chips;
the IGBT bridge is composed of 4 groups of low internal resistance N-channel S80N22T arrays, and the withstand voltage value of each tube reaches 80V;
the LC filter circuit is a low-pass filter circuit formed by connecting a high-power Fe-Si-Al inductor and a high-voltage capacitor in parallel, and the output end of the LC filter circuit is connected with an excitation transformer.
Compared with the prior art, the utility model discloses an advantage and beneficial effect are:
(1) utilize the electric automobile power supply, the power is got from electric automobile power supply, draws forth the test wire in the car to circuit breaker equipment and can accomplish withstand voltage test operation, has solved the actual difficult problem that high voltage circuit breaker alternating current withstand voltage test is difficult to obtain the power on the distribution network post. The vehicle-mounted integrated design improves the traditional discrete module wiring.
(2) The high-voltage circuit breaker is connected with the lead-out cable with large capacitance for testing, so that the effect of series resonance is achieved, the equipment volume is reduced, the waveform distortion of output voltage is improved, a good sine waveform is obtained, and the error breakdown of a harmonic peak value to a test product is effectively prevented. The coaxial cable has the advantages that the independent capacitor element is replaced by the ground capacitor, and the test efficiency is greatly improved.
(3) The output of the system is controlled by adopting the ZigBee wireless technology, so that the distance between a tester and high-voltage equipment is increased; specifically, the variable frequency power supply module is communicated with the handheld wireless controller in a Zigbee wireless communication mode, so that the safety of testers is guaranteed.
(4) The corresponding reactor unit is configured aiming at the capacitance of the 10kV high-voltage circuit breaker of the power distribution network, so that the volume of the device is effectively reduced, the problems that the equipment is heavy, needs a crane to install and is inconvenient to carry are solved, and the device has wide application value in the power test industry.
Drawings
To facilitate understanding and implementing the present invention by those of ordinary skill in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments, which are used to illustrate the present invention and should not be construed as limited by the scope of the present invention.
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a block diagram of a variable frequency power supply module according to the present invention.
In the figure: electric vehicle power output 1; a variable frequency power supply module 2; an excitation transformer 3; a reactor 4; a capacitive voltage divider 5; a coaxial cable capacitor 6; a circuit breaker under test 7; a handheld wireless controller 8; a wireless transceiver module 9; a key control 10; a TFT display panel 11; voltage sampling 12; current sampling 13; overcurrent protection 14; a microprocessor 15; a level conversion module 16; an IGBT bridge 17; an LC filter circuit 18.
Detailed Description
The utility model relates to a distribution network circuit breaker series resonance pressure resistant device of electric automobile power supply, as shown in FIG. 1, FIG. 1 is the utility model discloses an overall structure schematic diagram.
The whole device consists of modules integrated in a test box, wherein an electric vehicle power output 1 is connected with a variable frequency power module 2 through two pure copper storage batteries in a live wire, and the variable frequency power module 2 is connected with an exciting transformer 3 through two pure copper storage batteries in a live wire; one end of the secondary side of the exciting transformer 3 is grounded, and the other end of the secondary side of the exciting transformer is connected with the input end of the reactor 4 in series through a pure copper wire; the output end of the reactor 4 is connected with the input end of a high-voltage arm of the capacitive voltage divider 5 and the three input ends of u, v and w of the tested circuit breaker 7 through a pure copper coaxial cable, and a copper core of the pure copper coaxial cable; the coaxial cable capacitor 6 is a capacitor existing in two cables in the pure copper coaxial cable. The ground terminal of the capacitive voltage divider 5 is grounded through the shielding layer of the coaxial cable, and the U, V, W, N four output terminals or the housing of the tested circuit breaker 7 are grounded through the shielding layer of the coaxial cable. The variable frequency power supply module 2 is connected with the handheld wireless controller 8 in a wireless communication mode and is in wireless control. Each module is integrated in the test box, and corresponding units can be selected according to the specific tested distribution network equipment capacity, so that the device size is effectively reduced, and the problems of equipment heaviness, requirement for crane installation and inconvenience in carrying are solved.
Example 1:
the utility model relates to a distribution network circuit breaker series resonance pressure resistant device of electric automobile power supply is implemented according to following technical scheme:
the electric automobile power output provides a working power supply for the whole machine, has the characteristics of large capacity and reliable work, and can be used for carrying out a test only by driving a tester to a test tower.
The variable frequency power supply module 2 controls the handheld wireless controller 8 by a wireless communication means. The variable frequency power supply module 2 and the handheld wireless controller 8 both adopt Zigbee wireless communication technology.
The variable frequency power supply module 2 can output alternating currents with different amplitudes and frequencies according to actual needs, can output resonance high voltage when meeting the conditions of the following formulas, sends the voltage amplitudes at two ends of the tested circuit breaker 7 and the system output frequency value to the handheld wireless controller 8, and meanwhile refreshes the voltage amplitudes and the system output frequency value on the TFT display screen 11.
In the above formula: wherein f is the resonance frequency, pi is 3.1415926, L is the reactance value of the reactor 4, C is the capacitance value of the capacitive voltage divider 5, and the capacitance sum of the coaxial cable capacitor 6 and the tested circuit breaker 7.
Two pure copper storage batteries of the variable frequency power supply module 2 are connected with a live wire to a primary input end of the exciting transformer 3, after the voltage is boosted and isolated by the exciting transformer 3, a secondary side output end of the exciting transformer 3 is connected with the reactor 4 in series through a copper wire and is connected with the led-out capacitive voltage divider 5, the cable capacitor 6 and the tested circuit breaker 7 in parallel, and the tested circuit breaker 7 carries out a withstand voltage test under the condition of meeting the resonant frequency.
The handheld wireless controller 8 is operated by a tester in a handheld mode, the output of the ZigBee wireless technology control system is adopted, the distance between the tester and the high-voltage equipment is increased, and personal safety is guaranteed.
Example 2:
fig. 2 shows a block diagram of a variable frequency power supply module according to the present invention. Comprises a wireless transceiver module 9; a key control 10; a TFT display panel 11; voltage sampling 12; current sampling 13; overcurrent protection 14; a microprocessor 15; a level conversion module 16; an IGBT bridge 17; an LC filter circuit 18; an excitation transformer 3.
The wireless transceiver module 9 is connected with an asynchronous communication port of the microprocessor 15, the key control 10 is connected with an external interrupt A of the microprocessor 15, and the TFT display screen 11 is connected with a PortA port of the microprocessor 15; the voltage sample 12 is connected with an AD0 conversion port of the microprocessor 15, and the current samples 13 are connected with an AD1 conversion port of the microprocessor 15. The overcurrent protection 14 is connected to an external interrupt B of the microprocessor 15. The level shift module 16 is connected to the PWM0, PWM1, PWM2 and PWM3 output ports of the microprocessor 15. The IGBT bridge 17 is connected to the level shift module 16. The LC filter circuit 18 is connected to the IGBT bridge 17. All the modules are integrated on a circuit board. The output of the filter circuit 18 is connected to the excitation transformer 3.
The utility model is implemented according to the following technical scheme:
the wireless transceiver module 9 adopts a near field communication module based on a Zigbee wireless technology, and can meet the requirement of finishing interaction with the handheld wireless controller 8, thereby increasing the distance between a tester and high-voltage equipment and ensuring personal safety.
The key control 10 adopts matrix type sixteen-point key control, and the setting device for completing various parameters through the setting of testers has three working modes, so that users can flexibly select according to the field conditions, and the testing speed is improved. The working mode is as follows: full automatic mode, manual mode, auto-tune manual boost mode.
The TFT display screen 11 is composed of a large-screen color screen liquid crystal and has parameters such as same screen display system voltage, alternating current frequency and the like.
The voltage sample 12 tests the high voltage signal attenuated in proportion from the low voltage signal output of the capacitive voltage divider 5, is connected with the AD0 conversion port of the microprocessor 15, and inverts the actual high voltage amplitude value applied to the tested circuit breaker 7 according to the attenuation coefficient of the capacitive voltage divider 5.
The current sampling 13 and the overcurrent protection 14 simultaneously monitor the current of the primary side coil of the exciting transformer 3, are connected with an AD conversion port of the microprocessor 15, test the current value of the primary coil of the exciting transformer and display the current value on the TFT display screen 11, and a tester can timely master the running state of the system. When the current exceeds a set protection action value, the overcurrent protection module outputs an alarm signal, and the microprocessor 15 controls the whole machine to stop outputting, so that the safety of the circuit breaker is ensured.
The microprocessor 15 completes the test and processing of the data such as voltage, current and the like, and continuously controls the voltage Ux loaded on the tested circuit breaker to be the set sinusoidal voltage.
The level conversion module 16 is composed of two IR2113 MOS full-bridge driving chips, and has the characteristics of photoelectric isolation and electromagnetic isolation inside, so that conversion from a control signal to a power signal is realized.
The IGBT bridge 17 is composed of 4 groups of low internal resistance N-channel S80N22T arrays, the withstand voltage value of each tube can reach 80V, and the IGBT bridge has the advantages of low loss, high efficiency, stable output and the like, and the RDS of the on-resistance is less than 5m omega.
The LC filter circuit 18 is a low-pass filter circuit formed by connecting a high-power Fe-Si-Al inductor and a high-voltage capacitor in parallel, the waveform of the power output is smooth after low-pass filtering, the harmonic component is low, and the conversion from the waveform to a pure sine wave can be realized. The output end of the LC filter circuit 18 is connected to the exciting transformer 3.
When specifically implementing, the utility model relates to a distribution network circuit breaker series resonance pressure resistant device's of electric automobile power supply implementation control step as follows:
(1) when the trial distribution network circuit breaker is subjected to an alternating current withstand voltage test, the wires leading out of the cable are connected to each phase of the circuit breaker when the wires are the same, and the other phase is grounded or a shell. The signal line of the capacitive voltage divider 5 is connected to the variable frequency power supply module.
(2) And after the wiring is checked to be correct, a system power supply is turned on, the variable frequency power supply module 2 is set to output an initial voltage, and the initial voltage is added to the tested circuit breaker through the exciting transformer 3. The system searches the resonant point frequency of the output voltage at the frequency sweep interval of O.1Hz in the range of 30-300 Hz.
(3) During the frequency sweep, the output voltage peak of the system will also appear at a certain frequency, i.e. the resonant frequency, and lock automatically.
(4) The device has three working modes, is convenient for a user to flexibly select according to the field condition, and improves the test speed. The working mode is as follows: full automatic mode, manual mode, auto-tune manual boost mode. Selecting a proper mode for boosting according to actual requirements; and when the voltage rises to 42kV of rated test voltage of the tested circuit breaker, starting a voltage tracking mode.
(5) Until the end of the test after 3 minutes. If the insulation performance of the tested circuit breaker does not meet the requirement and the test is interrupted due to insulation flashover, the interruption reason of the test is judged and recorded.
(6) When the sample is broken down, the high voltage disappears immediately due to the loss of the resonance condition, the electric arc is extinguished immediately, the reestablishment process of the recovery voltage is long, and the power supply is easily disconnected before the flashover voltage is reached again.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (10)
1. The utility model provides a distribution network circuit breaker series resonance withstand voltage device of electric automobile power supply which characterized by: the power output (1) of the electric automobile is connected with a variable frequency power module (2), and the variable frequency power module (2) is connected with the primary side of an exciting transformer (3); one end of the secondary side of the exciting transformer (3) is grounded, and the other end of the secondary side of the exciting transformer is connected with the input end of the reactor (4) in series; the output end of the reactor (4) is connected with the input end of a high-voltage arm of the capacitive voltage divider (5) and the input end of the tested circuit breaker (7) through a pure copper coaxial cable, and a copper core of the reactor is simultaneously connected with the input end of the high-voltage arm of the capacitive voltage divider; the coaxial cable capacitor (6) is a capacitor existing in the cable; the grounding end of the capacitive voltage divider (5) is grounded through a shielding layer of a coaxial cable, and the shell or the grounding end of the tested circuit breaker (7) is grounded through the shielding layer of the coaxial cable; the variable frequency power supply module (2) is connected with the handheld wireless controller (8) in a wireless communication mode.
2. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 1, wherein: the power output (1) of the electric automobile is connected with the variable-frequency power module (2) through two pure copper storage batteries in a live wire mode, and the variable-frequency power module (2) is connected with the primary side of the exciting transformer (3) through two pure copper storage batteries in a live wire mode; one end of the secondary side of the exciting transformer (3) is grounded, and the other end of the secondary side of the exciting transformer is connected with the input end of the reactor (4) in series through a pure copper wire; the output end of the reactor (4) is connected with the input end of a high-voltage arm of the capacitive voltage divider (5) and the three input ends of u, v and w of the tested circuit breaker (7) through a pure copper coaxial cable, and a copper core of the reactor is connected with the input end of the high-voltage arm of the capacitive voltage divider (5) and the three input ends of the u, v and w of the; the coaxial cable capacitor (6) is a capacitor of two cables in the pure copper coaxial cable; u, V, W, N four output ends of the tested circuit breaker (7) are grounded through the shielding layer of the coaxial cable.
3. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 1, wherein: the power output (1) of the electric automobile provides a working power supply for the whole machine.
4. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 1, wherein: the variable frequency power supply module (2) controls the handheld wireless controller (8) in a wireless communication way; the variable frequency power supply module (2) and the handheld wireless controller (8) both adopt Zigbee wireless communication technology.
5. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 1, wherein: the variable frequency power supply module (2) outputs sinusoidal alternating currents with different amplitudes and frequencies.
6. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 1, wherein: two pure copper storage batteries of the variable frequency power supply module (2) are connected with a live wire to a low-voltage primary input end of the exciting transformer (3), and after being boosted and isolated by the exciting transformer (3), a secondary output end of the exciting transformer (3) is connected with the reactor (4) in series through a copper wire and is connected with the lead-out capacitive voltage divider (5), the cable capacitor (6) and the tested circuit breaker (7) in parallel.
7. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 1, wherein: the variable frequency power supply module (2) is connected with an asynchronous communication port of the microprocessor (15) through a wireless transceiving module (9), and the key control (10) is connected with an external interrupt A of the microprocessor (15); the TFT display screen (11) is connected with a PortA port of the microprocessor (15); the voltage sample (12) is connected with an AD0 conversion port of the microprocessor (15), and the current sample (13) is connected with an AD1 conversion port of the microprocessor (15); the overcurrent protection (14) is connected with an external interrupt B of the microprocessor (15), the level conversion module (16) is respectively connected with output ports of PWM0, PWM1, PWM2 and PWM3 of the microprocessor (15), and the IGBT bridge (17) is connected with the level conversion module (16); the IGBT bridge (17) is connected with an LC filter circuit (18), and all the modules are integrated on one circuit board.
8. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 7, wherein:
the wireless transceiver module (9) adopts a near field communication module based on Zigbee wireless technology to interact with the handheld wireless controller (8);
the key control (10) adopts a matrix type sixteen-point key control, and the working mode is as follows: a full-automatic mode, a manual mode, an automatic tuning manual boosting mode;
the TFT display screen (11) is composed of a large-screen color screen liquid crystal;
the voltage sample (12) is connected with an AD0 conversion port of the microprocessor (15);
and the current sampling (13) and the overcurrent protection (14) are simultaneously connected with an AD conversion port of the microprocessor (15).
9. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 7, wherein: the level conversion module (16) is composed of two IR2113 type MOS full-bridge driving chips; the IGBT bridge (17) is composed of 4 groups of low internal resistance N-channel S80N22T arrays, and the withstand voltage value of each tube reaches 80V.
10. The series resonance voltage withstand device of the power distribution network circuit breaker for electric vehicle power supply as claimed in claim 7, wherein: the LC filter circuit (18) is a low-pass filter circuit formed by connecting a high-power Fe-Si-Al inductor and a high-voltage capacitor in parallel, and the output end of the LC filter circuit (18) is connected with the exciting transformer (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921963520.7U CN212622935U (en) | 2019-11-14 | 2019-11-14 | Power distribution network circuit breaker series resonance voltage withstand device for power supply of electric automobile |
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| CN201921963520.7U CN212622935U (en) | 2019-11-14 | 2019-11-14 | Power distribution network circuit breaker series resonance voltage withstand device for power supply of electric automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824346A (en) * | 2019-11-14 | 2020-02-21 | 国网辽宁省电力有限公司电力科学研究院 | Power distribution network circuit breaker series resonance voltage withstand device for power supply of electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110824346A (en) * | 2019-11-14 | 2020-02-21 | 国网辽宁省电力有限公司电力科学研究院 | Power distribution network circuit breaker series resonance voltage withstand device for power supply of electric automobile |
| CN110824346B (en) * | 2019-11-14 | 2024-06-28 | 国网辽宁省电力有限公司电力科学研究院 | Power distribution network circuit breaker series resonance voltage withstand device for electric automobile power supply |
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