CN110690686B - Sulfur hexafluoride gas-based overvoltage protection method for power transmission and distribution equipment - Google Patents
Sulfur hexafluoride gas-based overvoltage protection method for power transmission and distribution equipment Download PDFInfo
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- CN110690686B CN110690686B CN201910922357.8A CN201910922357A CN110690686B CN 110690686 B CN110690686 B CN 110690686B CN 201910922357 A CN201910922357 A CN 201910922357A CN 110690686 B CN110690686 B CN 110690686B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
Abstract
The invention discloses an overvoltage protection method for power transmission and distribution equipment based on sulfur hexafluoride gas, which comprises the following steps: s1, firstly, installing a voltage tester at one side of the power transmission and distribution equipment, connecting a detection probe of the voltage tester with a power transmission line of the power transmission and distribution equipment to detect the output end of the power transmission line, and sending a signal instruction by a controller to detect the voltage of the output end of the power transmission line by the voltage tester; the voltage tester detects the voltage of the power transmission and distribution equipment, the voltage tester detects the power transmission and distribution equipment at intervals every 40 minutes, the detected data are collected by the central processing unit and transmitted to the display, the data after the latest inspection data are compared with the original data are selected, then the central processing unit judges whether a circuit fault exists in the interval, and after abnormal conditions are found, corresponding processing is immediately carried out, so that protective measures are carried out on the voltage, and the damage to the equipment is reduced.
Description
Technical Field
The invention belongs to the field of power transmission and distribution protection, and particularly relates to an overvoltage protection method for power transmission and distribution equipment based on sulfur hexafluoride gas.
Background
Sulfur hexafluoride is a stable gas with no color, odor, toxicity and combustion, and has the chemical formula SF6It has a molecular weight of 146.07, a density of 6.1kg/m3 at 20 ℃ and 0.1MPa, which is about 5 times the density of air; the sulfur hexafluoride is in a gaseous state at normal temperature and normal pressure, the critical temperature of the sulfur hexafluoride is 45.6 ℃, the triple point temperature is-50.8 ℃, and the sublimation point temperature is-63.8 ℃ at normal pressure; the sulfur hexafluoride molecular structure is arranged in an octahedron shape, the bonding distance is small, the bonding energy is high, so that the stability is high, the sulfur hexafluoride molecular structure is similar to nitrogen in compatibility with an electrical structure material when the temperature is not more than 180 ℃, and SF6 is strong electric negativeThe molecules of the sex gas are easy to adsorb free electrons to form negative ions with large mass, and the collision ionization process in the gas is weakened, so the electric insulation strength of the sex gas is very high and is about 2.5 times of the air insulation strength in a uniform electric field; the SF6 gas has a thermal decomposition peak when t is approximately equal to 2000K, so that when the alternating current arc current passes through zero, the cooling effect of SF6 on an arc channel is much stronger than that of air, and the arc extinguishing capacity is about 100 times of that of the air; since SF6 gas has excellent arc extinguishing and insulating properties and good chemical stability, it has been used as an arc extinguishing medium for high voltage circuit breakers since the end of the 50 s of the 20 th century; in the ultrahigh-voltage and extra-high-voltage circuit breakers, SF6 is used as an arc extinguishing medium, oil is replaced, and compressed air is largely replaced; at present, sulfur hexafluoride gas equipment transmission and distribution cannot achieve protection in advance due to more distribution lines, and once problems occur, equipment damage is caused.
Disclosure of Invention
The invention aims to provide an overvoltage protection method for power transmission and distribution equipment based on sulfur hexafluoride gas, and the method is used for solving the problem that power transmission and distribution of sulfur hexafluoride gas equipment cannot be protected in advance in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme: an overvoltage protection method for power transmission and distribution equipment based on sulfur hexafluoride gas comprises the following steps:
s1, firstly, installing a voltage tester at one side of power transmission and distribution equipment, connecting a detection probe of the voltage tester with a power transmission line of the power transmission and distribution equipment, detecting the output end of the power transmission line, sending a signal instruction by a controller of the voltage tester, detecting the voltage of the output end of the power transmission line, setting the controller to send the signal instruction to the voltage tester at different time periods, and carrying out interval detection on the voltage of the line;
s2, firstly, presetting an original data value and a limit value of line voltage, collecting data detected by a voltage tester through a central processing unit, transmitting the data to a display, displaying the detected data by the display, and comparing the originally set voltage data value with the detected voltage data value; after the comparison between the originally set voltage data value and the latest detected voltage data value, obtaining a voltage data difference value by the way that the originally set voltage data is greater than the latest detected voltage data value through the central processing unit, then obtaining a voltage data difference value by the way that the originally set voltage data is less than the latest detected data, and then comparing the difference between the latest detected data values every 40 minutes;
s3, if the compared data exceed the original voltage data range, judging whether the voltage of the power transmission and distribution has a fault, and detecting that the voltage data range exceeds a voltage limiting value;
and S4, if the compared data are within the original voltage data range, the voltage enters a protection state, wherein 10-20 pieces of data obtained by comparing the latest inspection data with the original data are selected for observation, if the data within the range appearing after the comparison are lower than the original data, the data comparison after the detection is carried out at intervals of 40 minutes within 3 hours is waited for observation, if no data value within the original data appears, the central processing unit sends an instruction to the controller, and the controller controls the equipment to enter a standby state.
As further preferable in the present technical solution: in S1, a normal voltage data value is set in the cpu, the voltage tester transmits data of voltage detection of the power transmission and distribution from the cpu to the display, the detected data is collected, the latest detected data at intervals of 40 minutes is compared with the originally set data, and the detected data at intervals of 40 minutes are compared with each other.
As further preferable in the present technical solution: in S3, selecting 10-20 pieces of data obtained by comparing latest inspection data with original data, observing, judging that the voltage of power transmission and distribution has a fault if the data in the range is higher than the original data, detecting the data in the period, sending an instruction to the controller by the central processor when the detected data reaches a limit value, sending the instruction to the alarm by the controller, giving an alarm by the alarm, and sending the instruction to the controller by the central processor if the voltage data exceeds the limit value, wherein the voltage distribution of the power transmission and distribution is automatically cut off by the controller.
As further preferable in the present technical solution:
as further preferable in the present technical solution: and selecting 10-20 pieces of data obtained by comparing the latest inspection data with the original data, observing, and if the detected data is within the normal working voltage range, normally working the equipment.
As further preferable in the present technical solution: all the detection data are collected, and the results of the stored data are classified and stored in the database according to the data values compared at intervals of 40 minutes.
As further preferable in the present technical solution: in S1, the time intervals of the different periods are such that the test is performed every 40 minutes.
The invention has the technical effects and advantages that: compared with the prior art, the over-voltage protection method for the power transmission and distribution equipment based on the sulfur hexafluoride gas has the following advantages that: the voltage tester detects the voltage of the power transmission and distribution equipment, the voltage tester detects the power transmission and distribution equipment at intervals every 40 minutes, the detected data are collected by the central processing unit and transmitted to the display, the data after the latest inspection data are compared with the original data are selected, then the central processing unit judges whether a circuit fault exists in the interval, and after abnormal conditions are found, corresponding processing is immediately carried out, so that protective measures are carried out on the voltage, and the damage to the equipment is reduced.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides an overvoltage protection method for sulfur hexafluoride gas-based power transmission and distribution equipment, which is shown in figure 1 and comprises the following steps:
s1, firstly, installing a voltage tester at one side of power transmission and distribution equipment, connecting a detection probe of the voltage tester with a power transmission line of the power transmission and distribution equipment, detecting the output end of the power transmission line, sending a signal instruction by a controller of the voltage tester, detecting the voltage of the output end of the power transmission line, setting the controller to send the signal instruction to the voltage tester at different time periods, and carrying out interval detection on the voltage of the line;
s2, firstly, presetting an original data value and a limit value of line voltage, collecting data detected by a voltage tester through a central processing unit, transmitting the data to a display, displaying the detected data by the display, and comparing the originally set voltage data value with the detected voltage data value;
s3, if the compared data exceed the original voltage data range, judging whether the voltage of the power transmission and distribution has a fault, and detecting that the voltage data range exceeds a voltage limiting value;
and S4, if the compared data is in the original voltage data range, the voltage enters a protection state.
In this embodiment, specifically: in S1, a normal voltage data value is set in the cpu, the voltage tester transmits the data of the voltage detection of the power transmission and distribution from the cpu to the display, the detected data is collected, the latest detected data at intervals of 40 minutes is compared with the originally set data, and the detected data at intervals of 40 minutes are compared with each other.
By adopting the technical scheme, the data of the voltage detection at intervals of 40 minutes are collected and classified for subsequent data comparison.
In this embodiment, specifically: in S2, after comparing the originally set voltage data value with the latest detected voltage data value, the originally set voltage data is larger than the latest detected voltage data value through the cpu to obtain a voltage data difference, the originally set voltage data is smaller than the latest detected voltage data to obtain a voltage data difference, and the differences between the latest detected data values at intervals of 40 minutes are compared.
By adopting the technical scheme, the value after data comparison is compared with the original data to obtain different data difference values, and whether the voltage needs to be protected or not is judged according to the difference of the data difference values.
In this embodiment, specifically: in S3, 10 pieces of data obtained by comparing latest inspection data with original data are selected for observation, if the data within the range is higher than the original data, the voltage of the power transmission and distribution is judged to have a fault, the detection is performed mainly in the period, when the detected data reach a limit value, the central processing unit sends an instruction to the controller, the controller sends the instruction to the alarm, the alarm gives an alarm, and if the voltage data exceed the limit value, the central processing unit sends the instruction to the controller, and the controller automatically cuts off the voltage distribution of the power transmission and distribution.
By adopting the technical scheme, most of the selected detection data is higher than the original data, or when the selected detection data reaches a limit value, the alarm automatically gives an alarm, and then the controller cuts off the distribution of the voltage to protect the voltage.
In this embodiment, specifically: all the detection data are collected, and the results of the stored data are classified and stored in the database according to the data values compared at intervals of 40 minutes.
By adopting the technical scheme, the storage and subsequent data checking of the detection data are facilitated.
In this embodiment, specifically: in S1, the time intervals of the different periods are such that the test is performed every 40 minutes.
By adopting the technical scheme, the detection data are frequently collected, and the voltage condition can be conveniently and timely known.
Example 2
The invention provides an overvoltage protection method for sulfur hexafluoride gas-based power transmission and distribution equipment, which comprises the following steps of:
s1, firstly, installing a voltage tester at one side of power transmission and distribution equipment, connecting a detection probe of the voltage tester with a power transmission line of the power transmission and distribution equipment, detecting the output end of the power transmission line, sending a signal instruction by a controller of the voltage tester, detecting the voltage of the output end of the power transmission line, setting the controller to send the signal instruction to the voltage tester at different time periods, and carrying out interval detection on the voltage of the line;
s2, firstly, presetting an original data value and a limit value of line voltage, collecting data detected by a voltage tester through a central processing unit, transmitting the data to a display, displaying the detected data by the display, and comparing the originally set voltage data value with the detected voltage data value;
s3, if the compared data exceed the original voltage data range, judging whether the voltage of the power transmission and distribution has a fault, and detecting that the voltage data range exceeds a voltage limiting value;
and S4, if the compared data is in the original voltage data range, the voltage enters a protection state.
In this embodiment, specifically: in S1, a normal voltage data value is set in the cpu, the voltage tester transmits data of voltage detection of the power transmission and distribution from the cpu to the display, the detected data is collected, the latest detected data at intervals of 40 minutes is compared with the originally set data, and the detected data at intervals of 40 minutes are compared with each other.
By adopting the technical scheme, the data of the voltage detection at intervals of 40 minutes are collected and classified for subsequent data comparison.
In this embodiment, specifically: in S2, after comparing the originally set voltage data value with the latest detected voltage data value, the originally set voltage data is larger than the latest detected voltage data value through the cpu to obtain a voltage data difference, the originally set voltage data is smaller than the latest detected voltage data to obtain a voltage data difference, and the differences between the latest detected data values at intervals of 40 minutes are compared.
By adopting the technical scheme, the value after data comparison is compared with the original data to obtain different data difference values, and whether the voltage needs to be protected or not is judged according to the difference of the data difference values.
In this embodiment, specifically: in S4, 10 pieces of data obtained by comparing the latest inspection data with the original data are selected and observed, if the data in the range after comparison is lower than the original data, the comparison of the data detected every 40 minutes within 3 hours is waited for and observed, and if no data value in the original data exists, in this case, the central processing unit sends an instruction to the controller, and the controller controls the device to enter a standby state.
By adopting the technical scheme, most of the selected detection data are lower than the data close to the original data, then the detection data within 3 hours are waited to be selected and compared, and the controller controls the equipment to enter a standby state under the condition that the lower data are still generated, so that the overvoltage protection effect is realized.
In this embodiment, specifically: all the detection data are collected, and the results of the stored data are classified and stored in the database according to the data values compared at intervals of 40 minutes.
By adopting the technical scheme, the storage and subsequent data checking of the detection data are facilitated.
In this embodiment, specifically: in S1, the time intervals of the different periods are such that the test is performed every 40 minutes.
By adopting the technical scheme, the detection data are frequently collected, and the voltage condition can be conveniently and timely known.
Example 3
The invention provides an overvoltage protection method for sulfur hexafluoride gas-based power transmission and distribution equipment, which comprises the following steps of:
s1, firstly, installing a voltage tester at one side of power transmission and distribution equipment, connecting a detection probe of the voltage tester with a power transmission line of the power transmission and distribution equipment, detecting the output end of the power transmission line, sending a signal instruction by a controller of the voltage tester, detecting the voltage of the output end of the power transmission line, setting the controller to send the signal instruction to the voltage tester at different time periods, and carrying out interval detection on the voltage of the line;
s2, firstly, presetting an original data value and a limit value of line voltage, collecting data detected by a voltage tester through a central processing unit, transmitting the data to a display, displaying the detected data by the display, and comparing the originally set voltage data value with the detected voltage data value;
s3, if the compared data exceed the original voltage data range, judging whether the voltage of the power transmission and distribution system has a fault, and the detected voltage data range exceeds the voltage limiting value;
and S4, if the compared data is in the original voltage data range, the voltage enters a protection state.
By adopting the technical scheme, the data of the voltage detection at intervals of 40 minutes are collected and classified for subsequent data comparison.
In this embodiment, specifically: in S1, a normal voltage data value is set in the cpu, the voltage tester transmits data of voltage detection of the power transmission and distribution from the cpu to the display, the detected data is collected, the latest detected data at intervals of 40 minutes is compared with the originally set data, and the detected data at intervals of 40 minutes are compared with each other.
By adopting the technical scheme, the data of the voltage detection at intervals of 40 minutes are collected and classified for subsequent data comparison.
In this embodiment, specifically: in S2, after comparing the originally set voltage data value with the latest detected voltage data value, the originally set voltage data is larger than the latest detected voltage data value through the cpu to obtain a voltage data difference, the originally set voltage data is smaller than the latest detected voltage data to obtain a voltage data difference, and the differences between the latest detected data values at intervals of 40 minutes are compared.
By adopting the technical scheme, the value after data comparison is compared with the original data to obtain different data difference values, and whether the voltage needs to be protected or not is judged according to the difference of the data difference values.
In this embodiment, specifically: and selecting 10 pieces of data obtained by comparing the latest inspection data with the original data, observing, and if the detected data is within the normal working voltage range, normally working the equipment.
By adopting the technical scheme, the detection data are in a normal range, and the voltage does not need to be protected.
In this embodiment, specifically: all the detection data are collected, and the results of the stored data are classified and stored in the database according to the data values compared at intervals of 40 minutes.
By adopting the technical scheme, the storage and subsequent data checking of the detection data are facilitated.
In this embodiment, specifically: in S1, the time intervals of the different periods are such that the test is performed every 40 minutes.
By adopting the technical scheme, the detection data are frequently collected, and the voltage condition can be conveniently and timely known.
The working principle is as follows: firstly, a worker presses a button of a controller, the controller sends an instruction to a voltage tester, an external power supply detects the voltage of power transmission and distribution equipment through the voltage tester, the controller is set to send the instruction to the voltage tester every 40 minutes, the power transmission and distribution equipment is subjected to interval detection, the detected data are collected through a central processing unit and then transmitted to a display, 10 pieces of data obtained by comparing latest inspection data with original data are selected for observation, and then whether circuit faults exist in the interval time or not is judged, so that voltage is protected, and if the data are in the normal range of the original data, the equipment operates normally.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. An overvoltage protection method for power transmission and distribution equipment based on sulfur hexafluoride gas is characterized in that: the method comprises the following steps:
s1, firstly, installing a voltage tester at one side of power transmission and distribution equipment, connecting a detection probe of the voltage tester with a power transmission line of the power transmission and distribution equipment, detecting the output end of the power transmission line, sending a signal instruction by a controller of the voltage tester, detecting the voltage of the output end of the power transmission line, setting the controller to send the signal instruction to the voltage tester at different time periods, and carrying out interval detection on the voltage of the line;
s2, firstly, presetting an original data value and a limit value of line voltage, collecting data detected by a voltage tester through a central processing unit, transmitting the data to a display, displaying the detected data by the display, and comparing the originally set voltage data value with the detected voltage data value; after the comparison between the originally set voltage data value and the latest detected voltage data value, obtaining a voltage data difference value by the way that the originally set voltage data is greater than the latest detected voltage data value through the central processing unit, then obtaining a voltage data difference value by the way that the originally set voltage data is less than the latest detected data, and then comparing the difference between the latest detected data values every 40 minutes;
s3, if the compared data exceed the original voltage data range, judging whether the voltage of the power transmission and distribution has a fault, and detecting that the voltage data range exceeds a voltage limiting value;
and S4, if the compared data are in the original voltage data range, the voltage enters a protection state, wherein 10-20 pieces of data obtained after the comparison of the latest inspection data and the original data are selected for observation, if the data in the range appearing after the comparison are lower than the original data, the data comparison after the detection is carried out every 40 minutes within 3 hours, the observation is carried out, if no data value in the original data appears, the central processing unit sends an instruction to the controller, and the controller controls the equipment to enter a standby state.
2. The sulfur hexafluoride gas-based power transmission and distribution equipment overvoltage protection method according to claim 1, wherein: in S1, a normal voltage data value is set in the cpu, the voltage tester transmits data of voltage detection of the power transmission and distribution from the cpu to the display, the detected data is collected, the latest detected data at intervals of 40 minutes is compared with the originally set data, and the detected data at intervals of 40 minutes are compared with each other.
3. The sulfur hexafluoride gas-based power transmission and distribution equipment overvoltage protection method according to claim 1, wherein: in S3, selecting 10-20 pieces of data obtained by comparing latest inspection data with original data, observing, judging that the voltage of power transmission and distribution has a fault if the data in the range is higher than the original data, detecting the data in the period, sending an instruction to the controller by the central processor when the detected data reaches a limit value, sending the instruction to the alarm by the controller, giving an alarm by the alarm, and sending the instruction to the controller by the central processor if the voltage data exceeds the limit value, wherein the voltage distribution of the power transmission and distribution is automatically cut off by the controller.
4. The sulfur hexafluoride gas-based power transmission and distribution equipment overvoltage protection method according to claim 1, wherein: and selecting 10-20 pieces of data obtained by comparing the latest inspection data with the original data, observing, and if the detected data is within the normal working voltage range, normally working the equipment.
5. The sulfur hexafluoride gas-based power transmission and distribution equipment overvoltage protection method according to claim 1, wherein: all the detection data are collected, and the results of the stored data are classified and stored in the database according to the data values compared at intervals of 40 minutes.
6. The sulfur hexafluoride gas-based power transmission and distribution equipment overvoltage protection method according to claim 1, wherein the method comprises the following steps: in S1, the time intervals of the different periods are such that the test is performed every 40 minutes.
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| CN101416364A (en) * | 2006-03-30 | 2009-04-22 | 新星产电株式会社 | High speed automatic circuit breaker for protection |
| CN102315634A (en) * | 2010-06-30 | 2012-01-11 | 通用电气公司 | The circuit-breaker that has overvoltage protection |
| CN103326320A (en) * | 2013-06-09 | 2013-09-25 | 常熟市九洲电器设备有限公司 | Motor overvoltage protection method |
| CN104793052A (en) * | 2015-05-12 | 2015-07-22 | 国家电网公司 | Intelligent air switch and intelligent power utilization system |
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