CN114221533A - Transient spike voltage absorption circuit of circuit breaker and detection method - Google Patents
Transient spike voltage absorption circuit of circuit breaker and detection method Download PDFInfo
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- CN114221533A CN114221533A CN202111527836.3A CN202111527836A CN114221533A CN 114221533 A CN114221533 A CN 114221533A CN 202111527836 A CN202111527836 A CN 202111527836A CN 114221533 A CN114221533 A CN 114221533A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 60
- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 230000001052 transient effect Effects 0.000 title claims abstract description 38
- 230000001419 dependent effect Effects 0.000 claims description 49
- 230000003993 interaction Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention relates to the technical field of circuit breakers, in particular to a transient spike voltage absorption circuit of a circuit breaker and a detection method, which comprise a main loop device and a control device, wherein the main loop device comprises a main loop circuit, a main loop circuit and a detection circuit; the control device comprises a controller, a detection module and a driving module; the device comprises a current transfer branch, a main through-current branch and an energy absorption branch; the energy absorption branch is respectively connected with the current transfer branch and the main through-current branch; the driving module is respectively connected with the current transfer branch and the main through-current branch; only one additional piezoresistor is added on the existing hybrid circuit breaker, whether the original piezoresistor is failed or disconnected is judged, and no cost is increased; the device can not only detect whether the original piezoresistor is failed and disconnected, but also ensure the safe and reliable disconnection of the hybrid circuit breaker; the adaptability, the safety and the reliability of the hybrid direct current circuit breaker are improved; once the controller detects that the voltage-sensitive resistor is failed to be disconnected, the breaker can not be started to be used until the failed voltage-sensitive resistor is replaced and reset.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a transient spike voltage absorption circuit of a circuit breaker and a detection method.
Background
A main through-current branch and a current transfer branch in the hybrid direct-current circuit breaker are connected with a zinc oxide piezoresistor in parallel to absorb transient spike voltage. According to a typical V-I characteristic curve of the zinc oxide piezoresistor, when the hybrid direct current circuit breaker is switched off, when the voltage of the main through-current branch and the voltage of the current transfer branch exceed the rated voltage of the zinc oxide piezoresistor, the piezoresistor works in a breakdown region and simultaneously and quickly absorbs peak energy, so that the main through-current branch and the current transfer branch are prevented from being damaged due to overvoltage. When the transient voltage at the two ends of the main through-current branch and the current transfer branch is lower than the rated voltage of the piezoresistor, the piezoresistor works in a pre-breakdown area, the voltage is equivalent to an insulation resistor above the M omega level, and the current passing through the piezoresistor is in microampere level. The piezoresistor absorbs the energy of the main current-passing branch and the current transfer branch when the main current-passing branch and the current transfer branch are turned off by utilizing the breakdown region.
Because the peak voltage generated by the line inductance energy is required to be absorbed by the piezoresistor when the hybrid direct-current circuit breaker is turned off every time, the performance of the piezoresistor is reduced after multiple times of energy impact, the service life is shortened, even the piezoresistor is invalid, and the peak overvoltage absorption function is not realized any more. After a voltage-dependent failure, the peak voltage at the turn-off of the hybrid dc circuit breaker continues to rise (due to the absence of voltage-dependent voltage clamping and energy absorption) until the transfer branch or the main current branch breaks down. At this time, the hybrid circuit breaker is damaged, and even if the control system can detect the voltage-dependent voltage failure, the transfer branch or the main through-current branch cannot be damaged by breakdown. The hybrid circuit breaker is a key protection device, and is required to be immediately disconnected when a load has a major fault such as a short circuit, but the main current branch or the transfer branch becomes a short-circuit element after being broken down by overvoltage, and cannot be disconnected, so that a larger systematic fault is caused.
In order to avoid the faults, the piezoresistor in the conventional hybrid direct-current circuit breaker adopts a regular replacement mode, and the piezoresistor is directly replaced no matter whether the service life is close to the service life or not, so that huge messy cost is caused; or the performance condition of the piezoresistor is detected by a measuring tool before the hybrid circuit breaker is used every time, and the time and the labor are consumed. If the piezoresistor is not replaced or detected regularly, the hybrid circuit breaker is in a suction working state, and huge potential safety hazards are faced when the hybrid circuit breaker is disconnected.
Disclosure of Invention
The invention aims to provide a transient spike voltage absorption circuit of a circuit breaker and a detection method aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme: a transient spike voltage absorption circuit of a circuit breaker comprises a main loop device and a control device; the control device comprises a controller, a detection module and a driving module; the controller is respectively connected with the detection module and the driving module; the main loop device comprises a current transfer branch, a main through-current branch and an energy absorption branch; the energy absorption branch is respectively connected with the current transfer branch and the main through-current branch; the driving module is respectively connected with the current transfer branch and the main through-current branch; the detection module is connected with the energy absorption branch;
the energy absorption branch comprises a primary voltage dependent resistor and a secondary voltage dependent resistor; the starting voltage of the secondary voltage dependent resistor is greater than that of the primary voltage dependent resistor; the residual voltage value of the secondary piezoresistor is greater than that of the primary piezoresistor; the starting voltage of the secondary piezoresistor and the residual voltage value of the secondary piezoresistor are both smaller than the rated voltage of the current transfer branch circuit and the rated voltage of the main through-current branch circuit.
The invention is further arranged that a solid-state switch is arranged in the current transfer branch; the solid-state switch is electrically connected with the controller.
The invention is further arranged that a fast mechanical switch is arranged in the main through-flow branch; the quick mechanical switch is electrically connected with the controller.
The invention is further configured such that the detection module comprises a voltage detection module; the voltage detection module is used for detecting the output voltage of the energy absorption branch circuit.
The invention is further configured such that the detection module comprises a current detection module and a temperature detection module.
The invention is further configured that the transient spike voltage absorption circuit of the circuit breaker further comprises a human-computer interaction module; the human-computer interaction module comprises a computer or a touch screen; the human-computer interaction module is connected with the controller.
The invention is further configured that the transient spike voltage absorption circuit of the circuit breaker further comprises an alarm; the alarm is connected with the controller.
A detection method of a transient spike voltage absorption circuit of a circuit breaker comprises the following steps:
A. closing the circuit breaker;
B. the first-stage piezoresistor is started to absorb transient peak voltage and release residual voltage;
C. the detection module detects the output voltage of the energy absorption branch circuit; if the output voltage of the energy absorption branch circuit is the same as the release residual voltage of the primary voltage dependent resistor, the primary voltage dependent resistor works normally, and if the output voltage of the energy absorption branch circuit is greater than the release residual voltage of the primary voltage dependent resistor, the secondary voltage dependent resistor is started;
D. the secondary piezoresistor is started to release residual voltage after absorbing transient peak voltage;
E. the detection module detects the output voltage of the energy absorption branch circuit; if the output voltage of the energy absorption branch circuit is the same as the residual voltage released by the secondary voltage dependent resistor, the primary voltage dependent resistor is damaged.
The invention has the beneficial effects that: 1. only one additional piezoresistor is added on the existing hybrid circuit breaker, whether the original piezoresistor fails to work or not can be skillfully judged, and the control and detection system does not increase any cost; 2. after the piezoresistors of multiple stages are added, whether the original piezoresistor fails to be disconnected or not can be detected, and the safe and reliable disconnection of the hybrid circuit breaker can be ensured; 3. the adaptability, the safety and the reliability of the hybrid direct current circuit breaker are improved; 4. once the controller detects that the voltage-sensitive resistor is failed and disconnected, the controller gives an alarm to prompt, and the hybrid circuit breaker can not be started to use until the failed voltage-sensitive resistor is replaced and reset.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of the main circuit arrangement of the present invention;
wherein: 1. a control device; 2. a main loop device; 3. a human-computer interaction module; 4. a current transfer branch; 5. a main through-flow branch; 6. a first-stage voltage dependent resistor; 7. a secondary voltage dependent resistor; 8. a voltage detection module; 9. a fast mechanical switch.
Detailed Description
The invention is further described with reference to the following examples.
As shown in fig. 1 to fig. 2, the transient spike voltage absorption circuit of the circuit breaker according to the present embodiment includes a main circuit device 2 and a control device 1; the control device 1 comprises a controller, a detection module and a driving module; the controller is respectively connected with the detection module and the driving module; the main loop device 2 comprises a current transfer branch 4, a main through-current branch 5 and an energy absorption branch; the energy absorption branch is respectively connected with the current transfer branch 4 and the main through-current branch 5; the driving module is respectively connected with the current transfer branch 4 and the main through-current branch 5; the detection module is connected with the energy absorption branch;
the energy absorption branch comprises a primary voltage dependent resistor 6 and a secondary voltage dependent resistor 7; the starting voltage of the secondary voltage dependent resistor 7 is greater than that of the primary voltage dependent resistor 6; the residual voltage value of the secondary piezoresistor 7 is greater than that of the primary piezoresistor 6; the starting voltage of the secondary voltage dependent resistor 7 and the residual voltage value of the secondary voltage dependent resistor 7 are both smaller than the rated voltage of the current transfer branch 4 and the rated voltage of the main through-current branch 5.
Specifically, in the transient spike voltage absorption circuit of the circuit breaker according to this embodiment, the energy absorption branch is composed of two stages of piezoresistors, the turn-on voltage and the residual voltage value of the second stage piezoresistor 7 are respectively higher than the turn-on voltage and the residual voltage value of the first stage piezoresistor 6, but lower than the switch rated voltages of the main through-current branch 5 and the current transfer branch 4, and the turn-on voltage and the residual voltage value of the second stage piezoresistor 7 are at least 5% higher than the turn-on voltage and the residual voltage value of the first stage piezoresistor 6, but are much smaller than the rated voltage values of the main through-current branch 5 and the transfer branch. Under the condition that the primary piezoresistor 6 works, the secondary piezoresistor 7 cannot work; in the turn-off process of the hybrid circuit breaker, if the voltage of the secondary piezoresistor 7 is clamped, the hybrid circuit breaker starts to work, the primary piezoresistor 6 is shown to be damaged, and the control system gives an alarm.
For example, the rated voltage of the main through-current branch 5 and the current transfer branch 4 of a 4500V/3000A hybrid dc circuit breaker is 10kV, the turn-on voltage of the primary varistor 6 is 5000V, the residual voltage value is 5500V, the turn-on voltage of the secondary varistor 7 is 6000V, and the residual voltage value is 6500V. When the hybrid direct current breaker is turned off, if the maximum voltage detection value is about 5500V, the primary piezoresistor 6 is normal; if the maximum value of the voltage detection value is about 6500V, the primary piezoresistor 6 is failed and disconnected, and the secondary piezoresistor 7 is used. Once the voltage detection value is about 6500V, the controller must give an alarm to indicate that a piezoresistor is failed and damaged and needs to be replaced.
The voltage detection module 8 is an inherent accessory of the hybrid circuit breaker, and is used for measuring and protecting rated voltage of the circuit breaker and detecting on-off of the circuit breaker at ordinary times. The invention utilizes the sensor and the detection circuit thereof to carry out pressure-sensitive failure disconnection detection without increasing the cost.
In the embodiment, only one additional piezoresistor 6 is added on the conventional hybrid circuit breaker, so that whether the original piezoresistor fails to be disconnected or not can be skillfully judged, and the control and detection system does not increase any cost; after the piezoresistor 6 is added in more stages, whether the original piezoresistor fails to be disconnected or not can be detected, and the safe and reliable disconnection of the hybrid circuit breaker can be ensured; the adaptability, the safety and the reliability of the hybrid direct current circuit breaker are improved; once the controller detects that the voltage-sensitive resistor is failed and disconnected, the controller gives an alarm to prompt, and the hybrid circuit breaker can not be started to use until the failed voltage-sensitive resistor is replaced and reset.
In the transient spike voltage absorption circuit of the circuit breaker according to this embodiment, a solid-state switch is disposed in the current transfer branch 4; the solid-state switch is electrically connected with the controller. The function of the current transfer branch 4 can be achieved by the above arrangement.
In the transient spike voltage absorption circuit of the circuit breaker according to this embodiment, a fast mechanical switch 9 is disposed in the main through-current branch 5; the quick mechanical switch 9 is electrically connected with the controller. The effect of the main flow branch 5 can be achieved by the above-described arrangement.
In the transient spike voltage absorption circuit of the circuit breaker according to this embodiment, the detection module includes a voltage detection module 8; the voltage detection module 8 is configured to detect an output voltage of the energy absorption branch. Specifically, the output voltage of the energy absorption branch can be detected through the above arrangement, so as to judge whether the primary voltage dependent resistor 6 works normally.
The circuit breaker transient spike voltage absorption circuit of this embodiment, the detection module includes current detection module and temperature detection module. The current and the temperature of the circuit breaker can be detected through the arrangement.
According to the transient spike voltage absorption circuit of the circuit breaker, the transient spike voltage absorption circuit of the circuit breaker further comprises a human-computer interaction module 3; the human-computer interaction module 3 comprises a computer or a touch screen; the human-computer interaction module 3 is connected with the controller. The user can conveniently control the operation through the setting.
According to the transient spike voltage absorption circuit of the circuit breaker, the transient spike voltage absorption circuit of the circuit breaker further comprises an alarm; the alarm is connected with the controller.
And after the controller detects that the primary pressure-sensitive failure is disconnected, the alarm gives an alarm for prompting. If the user does piezoresistor fault resetting without replacing the piezoresistor with fault, the failure disconnection fault of the piezoresistor is detected again when the hybrid circuit breaker is disconnected next time, at the moment, the control system does not accept the piezoresistor resetting of the user any more, and the program code can be used only by downloading the program code again by the manufacturer
Specifically, when the controller detects the clamping voltage of the secondary voltage dependent resistor 7, the primary voltage dependent resistor 6 is proved to be failed and disconnected, the controller is communicated with the man-machine interaction module 3, and the alarm is given out on a computer or a display screen through an alarm. The user can clear the alarm through the man-machine interaction module 3, but the mixed breaker reports the piezoresistor fault after being continuously switched on and off twice, so that the alarm cannot be cleared through the man-machine interaction module 3, and a manufacturer needs to rewrite the controller program.
Before the mixed circuit breaker leaves a factory, residual voltage values of a primary voltage dependent resistor 6 and a secondary voltage dependent resistor 7 are set in a controller, the controller can automatically detect and sample voltage values at two ends (two ends of the voltage dependent resistor) of a switch, the voltage values are compared with the set residual voltage values, and if a highest voltage measured value is near to the primary voltage dependent residual voltage value (plus or minus 5 percent), the primary voltage dependent resistor 6 is normal; if the highest voltage measurement value is near the secondary voltage-dependent residual voltage value (+ -5%), it indicates that the first-stage voltage-dependent resistor 6 has failed to be disconnected and no longer plays a voltage clamping role.
The detection method for the transient spike voltage absorption circuit of the circuit breaker in the embodiment comprises the following steps:
A. closing the circuit breaker;
B. the first-stage piezoresistor 6 is started to absorb transient peak voltage and release residual voltage;
C. the detection module detects the output voltage of the energy absorption branch circuit; if the output voltage of the energy absorption branch circuit is the same as the release residual voltage of the primary voltage dependent resistor 6, the primary voltage dependent resistor 6 works normally, and if the output voltage of the energy absorption branch circuit is greater than the release residual voltage of the primary voltage dependent resistor 6, the secondary voltage dependent resistor 7 is started;
D. the secondary voltage dependent resistor 7 is started to absorb the transient peak voltage and then release the residual voltage;
E. the detection module detects the output voltage of the energy absorption branch circuit; if the output voltage of the energy absorption branch circuit is the same as the release residual voltage of the secondary voltage dependent resistor 7, the primary voltage dependent resistor 6 is damaged.
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 protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A circuit breaker transient spike voltage absorption circuit characterized in that: comprises a main loop device (2) and a control device (1); the control device (1) comprises a controller, a detection module and a driving module; the controller is respectively connected with the detection module and the driving module; the main loop device (2) comprises a current transfer branch (4), a main through-current branch (5) and an energy absorption branch; the energy absorption branch is respectively connected with the current transfer branch (4) and the main through-current branch (5); the driving module is respectively connected with the current transfer branch (4) and the main through-current branch (5); the detection module is connected with the energy absorption branch;
the energy absorption branch comprises a primary piezoresistor (6) and a secondary piezoresistor (7); the starting voltage of the secondary voltage dependent resistor (7) is greater than that of the primary voltage dependent resistor (6); the residual voltage value of the secondary piezoresistor (7) is greater than that of the primary piezoresistor (6); the starting voltage of the secondary voltage dependent resistor (7) and the residual voltage value of the secondary voltage dependent resistor (7) are both smaller than the rated voltage of the current transfer branch circuit (4) and the rated voltage of the main through-current branch circuit (5).
2. The circuit breaker transient spike voltage snubber circuit of claim 1, wherein: a solid-state switch is arranged in the current transfer branch (4); the solid-state switch is electrically connected with the controller.
3. The circuit breaker transient spike voltage snubber circuit of claim 1, wherein: a quick mechanical switch (9) is arranged in the main through-flow branch (5); the quick mechanical switch (9) is electrically connected with the controller.
4. The circuit breaker transient spike voltage snubber circuit of claim 1, wherein: the detection module comprises a voltage detection module (8); the voltage detection module (8) is used for detecting the output voltage of the energy absorption branch circuit.
5. The circuit breaker transient spike voltage snubber circuit of claim 1, wherein: the detection module comprises a current detection module and a temperature detection module.
6. The circuit breaker transient spike voltage snubber circuit of claim 1, wherein: the circuit breaker transient spike voltage absorption circuit further comprises a human-computer interaction module (3); the human-computer interaction module (3) comprises a computer or a touch screen; the human-computer interaction module (3) is connected with the controller.
7. The circuit breaker transient spike voltage snubber circuit of claim 1, wherein: the circuit breaker transient spike voltage absorption circuit further comprises an alarm; the alarm is connected with the controller.
8. A detection method for the transient spike voltage absorption circuit of the circuit breaker according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
A. closing the circuit breaker;
B. the first-stage piezoresistor (6) is started to absorb transient peak voltage and release residual voltage;
C. the detection module detects the output voltage of the energy absorption branch circuit; if the output voltage of the energy absorption branch circuit is the same as the release residual voltage of the primary voltage dependent resistor (6), the primary voltage dependent resistor (6) works normally, and if the output voltage of the energy absorption branch circuit is larger than the release residual voltage of the primary voltage dependent resistor (6), the secondary voltage dependent resistor (7) is started;
D. the secondary voltage dependent resistor (7) is started to release residual voltage after absorbing transient peak voltage;
E. the detection module detects the output voltage of the energy absorption branch circuit; if the output voltage of the energy absorption branch circuit is the same as the release residual voltage of the secondary voltage dependent resistor (7), the primary voltage dependent resistor (6) is damaged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111527836.3A CN114221533A (en) | 2021-12-14 | 2021-12-14 | Transient spike voltage absorption circuit of circuit breaker and detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111527836.3A CN114221533A (en) | 2021-12-14 | 2021-12-14 | Transient spike voltage absorption circuit of circuit breaker and detection method |
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| CN114221533A true CN114221533A (en) | 2022-03-22 |
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| CN202111527836.3A Pending CN114221533A (en) | 2021-12-14 | 2021-12-14 | Transient spike voltage absorption circuit of circuit breaker and detection method |
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| CN201436758U (en) * | 2009-05-22 | 2010-04-07 | 上海科晗实业有限公司 | Large-current surge protector piezoresistor short-circuit-resistant device |
| CN101964519A (en) * | 2009-07-21 | 2011-02-02 | Abb法国公司 | Device for the protection of an electrical installation against voltage surges |
| CN103368157A (en) * | 2012-04-06 | 2013-10-23 | 上海微电子装备有限公司 | Surge protection device |
| EP3218979A1 (en) * | 2014-10-09 | 2017-09-20 | Siemens Canada Limited | Varistor failure detector and method |
| CN108008192A (en) * | 2017-11-29 | 2018-05-08 | 合肥岭启信息科技有限公司 | A kind of overvoltage protection device with varistor malfunction monitoring |
| CN110429562A (en) * | 2019-08-22 | 2019-11-08 | 西南交通大学 | Hybrid high voltage DC breaker and its control method based on normal open type SIC device |
| JP2020005357A (en) * | 2018-06-26 | 2020-01-09 | 日新電機株式会社 | Protection circuit |
-
2021
- 2021-12-14 CN CN202111527836.3A patent/CN114221533A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201436758U (en) * | 2009-05-22 | 2010-04-07 | 上海科晗实业有限公司 | Large-current surge protector piezoresistor short-circuit-resistant device |
| CN101964519A (en) * | 2009-07-21 | 2011-02-02 | Abb法国公司 | Device for the protection of an electrical installation against voltage surges |
| CN103368157A (en) * | 2012-04-06 | 2013-10-23 | 上海微电子装备有限公司 | Surge protection device |
| EP3218979A1 (en) * | 2014-10-09 | 2017-09-20 | Siemens Canada Limited | Varistor failure detector and method |
| CN108008192A (en) * | 2017-11-29 | 2018-05-08 | 合肥岭启信息科技有限公司 | A kind of overvoltage protection device with varistor malfunction monitoring |
| JP2020005357A (en) * | 2018-06-26 | 2020-01-09 | 日新電機株式会社 | Protection circuit |
| CN110429562A (en) * | 2019-08-22 | 2019-11-08 | 西南交通大学 | Hybrid high voltage DC breaker and its control method based on normal open type SIC device |
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Application publication date: 20220322 |