CN111682514A - 10kV overhead line interphase fault level difference protection method and system and terminal equipment - Google Patents
10kV overhead line interphase fault level difference protection method and system and terminal equipment Download PDFInfo
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- CN111682514A CN111682514A CN202010630911.8A CN202010630911A CN111682514A CN 111682514 A CN111682514 A CN 111682514A CN 202010630911 A CN202010630911 A CN 202010630911A CN 111682514 A CN111682514 A CN 111682514A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
Abstract
The embodiment of the invention relates to a 10kV overhead line interphase fault level difference protection method, a system and terminal equipment. According to the 10kV overhead line interphase fault level difference protection method, the reactor and the phase selection switching-on device are connected in parallel on the second switch, when the overhead line fails, the reactor is connected in series into the circuit to limit fault current, the faults of the overhead line are removed section by adopting the level difference protection of the first switch, the third switch and the fourth switch, the direct action of the first switch in a substation after the faults occur can be avoided, the large-area power failure of the substation is avoided, the technical problem that the large-area power failure of the area of the overhead line can be caused after the interphase short circuit fault occurs on the overhead line due to the existing overhead line stepless difference protection is solved.
Description
Technical Field
The invention relates to the technical field of overhead lines, in particular to a 10kV overhead line interphase fault level difference protection method, a system and terminal equipment.
Background
The overhead line mainly refers to an overhead open line, is erected above the ground and is a power transmission line for transmitting electric energy by fixing a power transmission conductor on a tower erected on the ground through an insulator. The power transmission corridor is convenient to erect and maintain and low in cost, but is easily affected by weather and environment (such as strong wind, lightning stroke, dirt, ice and snow and the like) to cause faults, and meanwhile, the whole power transmission corridor occupies a large area of land and easily causes electromagnetic interference to the surrounding environment.
When an interphase short circuit fault occurs in the existing overhead line, a switch in a transformer substation can be directly tripped, no stage difference protection can be formed between the transformer substation and the overhead line, the reliability of the overhead line is poor, and large-area power failure of the area of the overhead line can be caused when the fault occurs.
Disclosure of Invention
The embodiment of the invention provides a 10kV overhead line interphase fault level difference protection method, a system and terminal equipment, which are used for solving the technical problem that the existing overhead line stepless difference protection can cause large-area power failure in an area of an overhead line after an interphase short-circuit fault occurs on the overhead line.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
the 10kV overhead line interphase fault level difference protection method comprises an overhead line and a transformer substation connected with the overhead line, wherein a first switch is arranged in the transformer substation, at least a second switch, a third switch and a fourth switch are arranged on the overhead line, a reactor and a phase selection switching-on device are connected in parallel to the second switch, when the overhead line has a fault, the second switch is disconnected, the first switch, the reactor, the third switch and the fourth switch form a current-limiting loop, and the 10kV overhead line interphase fault level difference protection method comprises the following steps:
s1, disconnecting the fourth switch, and executing the step S2;
s2, detecting the current of the third switch, if the current of the third switch is equal to the current setting value of the third switch, disconnecting the third switch, and executing the step S3;
and S3, detecting the current of the first switch, and if the current of the first switch is equal to the current setting value of the first switch, disconnecting the first switch, and removing the fault of the overhead line.
Preferably, in S2, if the current of the third switch is smaller than the current setting value of the third switch, the fault of the overhead line is cut off.
Preferably, in S3, if the current of the first switch is smaller than the current setting value of the first switch, the fault of the overhead line is cut off.
Preferably, the 10kV overhead line inter-phase fault level difference protection method further comprises a quick switch for quickly disconnecting the line as the second switch.
Preferably, the current limiting loop is used for limiting fault current of the overhead line in fault.
Preferably, the first switch, the second switch, the third switch and the fourth switch are sequentially connected in series, and the first switch, the second switch, the third switch and the fourth switch are all provided with different opening or closing time.
The invention also provides a 10kV overhead line interphase fault level difference protection system, which comprises an overhead line and a transformer substation connected with the overhead line, wherein a first switch is arranged in the transformer substation, at least a second switch, a third switch and a fourth switch are arranged on the overhead line, a reactor and a phase selection switching-on device are connected in parallel on the second switch, when the overhead line fails, the second switch is disconnected, the first switch, the reactor, the third switch and the fourth switch form a current limiting loop, and the 10kV overhead line interphase fault level difference protection system comprises a first execution unit, a second execution unit and a third execution unit:
the first execution unit is used for switching off the fourth switch;
the second execution unit is used for detecting the current of the third switch based on the first execution unit and opening the third switch according to the fact that the current of the third switch is equal to the current setting value of the third switch;
and the third execution unit is used for detecting the current of the first switch based on the second execution unit, and disconnecting the first switch according to the fact that the current of the first switch is equal to the current setting value of the first switch, so that the fault of the overhead line is removed.
Preferably, the second execution unit is further configured to remove the fault of the overhead line according to that the current of the third switch is smaller than the current setting value of the third switch; the third execution unit is further used for cutting off the fault of the overhead line according to the fact that the current of the first switch is smaller than the current setting value of the first switch.
The present invention also provides a computer readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the above-described 10kV overhead line inter-phase fault level difference protection method.
The invention also provides a terminal device, comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
and the processor is used for executing the 10kV overhead line inter-phase fault level difference protection method according to the instructions in the program codes.
According to the technical scheme, the embodiment of the invention has the following advantages:
1. according to the 10kV overhead line interphase fault level difference protection method, the reactor and the phase selection switching-on device are connected in parallel on the second switch, when the overhead line fails, the reactor is connected in series into the circuit to limit fault current, the faults of the overhead line are removed section by adopting the level difference protection of the first switch, the third switch and the fourth switch, the direct action of the first switch in a substation after the faults occur can be avoided, the large-area power failure of the substation is avoided, the technical problem that the large-area power failure of the area of the overhead line can be caused after the interphase short circuit fault occurs on the overhead line due to the existing overhead line stepless difference protection is solved.
2. This 10kV overhead line interphase fault stage difference protection system is through reactor and the select looks closing device that connects in parallel on the second switch, when the overhead line broke down, because the reactor cluster goes into the circuit, restriction fault current, adopt first execution unit, second execution unit and third execution unit control first switch, third switch and fourth switch disconnection, realize the stage difference protection to the overhead line, thereby the trouble of section-by-section excision overhead line, can avoid the first switch direct action in the transformer substation station after breaking down, the regional large tracts of land that has avoided the transformer substation has been cut out, the current overhead line does not have the stage difference protection, can cause the regional large tracts of land that has a power failure of overhead line after the interphase short circuit trouble takes place on the overhead line technical problem.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of steps of a 10kV overhead line inter-phase fault level difference protection method according to an embodiment of the present invention.
Fig. 2 is a frame diagram of the 10kV overhead line inter-phase fault level difference protection method level difference protection according to the embodiment of the present invention.
Fig. 3 is a frame diagram of a 10kV overhead line inter-phase fault level difference protection system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The embodiment of the application provides a 10kV overhead line interphase fault level difference protection method, a system and terminal equipment, which are used for carrying out level difference fault removal on an overhead line, avoiding large-area power failure in a transformer substation area, and solving the technical problem that the large-area power failure in the overhead line area can be caused after an interphase short circuit fault occurs on the overhead line due to the existing level difference-free protection of the overhead line.
The first embodiment is as follows:
fig. 1 is a flowchart of steps of a 10kV overhead line inter-phase fault level difference protection method according to an embodiment of the present invention, and fig. 2 is a frame diagram of the 10kV overhead line inter-phase fault level difference protection method according to the embodiment of the present invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides a 10kV overhead line interphase fault level difference protection method, including an overhead line 10 and a substation connected to the overhead line 10, where a first switch K1 is disposed in the substation, the overhead line 10 is at least provided with a second switch K2, a third switch K3, and a fourth switch K4, the second switch K1 is connected in parallel with a reactor 20 and a phase selection and closing device 30, when the overhead line 10 fails, the second switch K2 is opened, and the first switch K1, the reactor 20, the third switch K3, and the fourth switch K4 form a current limiting loop, where the 10kV overhead line interphase fault level difference protection method includes the following steps:
s1, disconnecting the fourth switch, and executing the step S2;
s2, detecting the current of the third switch, if the current of the third switch is equal to the current setting value of the third switch, disconnecting the third switch, and executing the step S3;
and S3, detecting the current of the first switch, and if the current of the first switch is equal to the current setting value of the first switch, disconnecting the first switch and cutting off the fault of the overhead line.
In the embodiment of the present invention, the phase selection switching-on device 30 is mainly used to control all switches arranged on the overhead line 10 to sequentially operate according to the setting time.
The phase selection closing device 30 may be a high-voltage high-current phase selection closing device such as CN105374615A, or may be an electrical device having a function of sequentially operating all switches in a circuit according to a setting time.
In the embodiment of the present invention, the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are sequentially connected in series. The first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are all provided with different open or close time, that is, different time limits can be set for different numbers of switches.
In an embodiment of the present invention, the second switch K2 is a fast switch that quickly opens the line.
In an embodiment of the invention, the current limiting loop is primarily used to limit fault currents in the overhead line 10 in the event of a fault. When the overhead line 10 has a fault, the second switch K2 is switched from closed to open, the reactor 20 is connected in series with the fault phase, and the fault current can be limited due to the sudden change of the current limited by the reactor 20. On the basis of the 10kV overhead line interphase fault level difference protection method, level difference protection is set for a first switch K1, a third switch K3 and a fourth switch K4; firstly, the second switch K4 is switched off, and whether the fault of the overhead line 10 is cut off or not is judged; if not, the third switch K3 is switched off, and whether the fault of the overhead line 10 is cut off is judged again; if not, the first switch K1 is turned off, and the fault of the overhead line 10 is removed.
It should be noted that, when an inter-phase short-circuit fault occurs in the overhead line 10, the existing processing mode is to turn off the first switch K1 in the substation station, and the 10kV overhead line inter-phase fault level difference protection method is to perform level difference protection on the overhead line 10, and the reactor 20 and the phase selection switching-on device 30 are connected in parallel to the second switch K2 connected to the outgoing line end in the substation station, when an inter-phase short-circuit fault occurs, the reactor 20 is connected in series to limit the fault current, the level difference protection of the first switch K1, the third switch K3 and the fourth switch K4 can be set in time, and the fault of the overhead line 20 is removed section by section, if the fault occurs on the line side, the action of the first switch K1 in the substation station can be avoided, and large area power failure in the substation area is avoided. Wherein the first switch K1, the third switch K3 and the fourth switch K4 are provided with different setting time and time limit protection
According to the 10kV overhead line interphase fault level difference protection method, the reactor and the phase selection switching-on device are connected in parallel on the second switch, when the overhead line fails, the reactor is connected in series into the circuit to limit the fault current, the level difference protection of the first switch, the third switch and the fourth switch is adopted to remove the faults of the overhead line section by section, the first switch in a substation can be prevented from directly acting after the faults occur, large-area power failure of the substation is avoided, and the technical problem that the existing overhead line has no level difference protection and large-area power failure of the area of the overhead line can be caused after the interphase short circuit fault occurs on the overhead line is solved.
In one embodiment of the present invention, in S2, if the current of the third switch is less than the current setting of the third switch, the fault of the overhead line is cut off. In S3, if the current of the first switch is smaller than the current setting value of the first switch, the fault of the overhead line is removed.
Example two:
fig. 3 is a frame diagram of a 10kV overhead line inter-phase fault level difference protection system according to an embodiment of the present invention.
As shown in fig. 2 and fig. 3, an embodiment of the present invention further provides a 10kV overhead line interphase fault level difference protection system, which includes an overhead line 10 and a substation connected to the overhead line 10, where a first switch K1 is disposed in the substation, the overhead line 10 is at least provided with a second switch K2, a third switch K3, and a fourth switch K4, the second switch K2 is connected in parallel with a reactor 20 and a phase selection closing device 30, when the overhead line 10 fails, the second switch K2 is disconnected, and the first switch K1, the reactor 20, the third switch K3, and the fourth switch K4 form a current limiting loop, and the 10kV overhead line interphase fault level difference protection system includes a first execution unit 1, a second execution unit 2, and a third execution unit 3;
a first execution unit 1 for turning off the fourth switch K4;
a second performing unit 2 for detecting a current of the third switch K3 based on the first performing unit 1, and opening the third switch K3 according to the current setting value of the third switch K3 being equal to the current setting value of the third switch K3;
and the third execution unit 3 is used for detecting the current of the first switch K1 based on the second execution unit 2, and according to the fact that the current of the first switch K1 is equal to the current setting value of the first switch K1, the first switch K1 is opened, and the fault of the overhead line 10 is cut off.
In an embodiment of the present invention, the second execution unit 2 is further configured to, in accordance with that the current of the third switch K is smaller than the current setting value of the third switch K3, remove the fault of the overhead line 10; the third execution unit 3 is also used for cutting off the fault of the overhead line 10 according to the condition that the current of the first switch K1 is smaller than the current setting value of the first switch K1.
It should be noted that, the units of the system in the second embodiment are arranged in a one-to-one correspondence with the steps of the method in the first embodiment, and the steps of the method have been already set forth in the first embodiment one by one, and therefore are not described in the second embodiment one by one.
According to the 10kV overhead line interphase fault level difference protection system, the reactor and the phase selection switching-on device are connected in parallel on the second switch, when the overhead line fails, the reactor is connected in series with the circuit to limit the fault current, the first execution unit, the second execution unit and the third execution unit are adopted to control the first switch, the third switch and the fourth switch to be switched off, and the level difference protection of the overhead line is realized, so that the faults of the overhead line are cut off section by section, the first switch in a substation can be prevented from directly acting after the faults occur, large-area power failure of a transformer substation area is avoided, and the technical problem that the existing overhead line has no level difference protection, and large-area power failure of the overhead line can be caused after the interphase short circuit fault occurs on the overhead line is solved.
Example three:
the embodiment of the invention also provides a computer-readable storage medium, which is used for storing computer instructions, and when the computer-readable storage medium runs on a computer, the computer is enabled to execute the 10kV overhead line inter-phase fault level difference protection method.
Example four:
the embodiment of the present invention further provides a terminal device, which is characterized by comprising a processor and a memory:
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the 10kV overhead line inter-phase fault level difference protection method according to instructions in the program codes.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing certain functions, the instruction segments describing the execution of a computer program in a device.
The device may be a computing device such as a desktop computer, a notebook, a palm top computer, a cloud server, and the like. The device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the computer device, such as a hard disk or a memory of the computer device. The memory may also be an external storage device of the computer device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the computer device. Further, the memory may also include both internal and external storage units of the computer device. The memory is used for storing computer programs and other programs and data required by the computer device. The memory may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, methods and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The 10kV overhead line interphase fault level difference protection method comprises an overhead line and a transformer substation connected with the overhead line, wherein a first switch is arranged in the transformer substation, and at least a second switch, a third switch and a fourth switch are arranged on the overhead line, and the 10kV overhead line interphase fault level difference protection method is characterized in that a reactor and a phase selection switching-on device are connected in parallel on the second switch, when the overhead line fails, the second switch is disconnected, the first switch, the reactor, the third switch and the fourth switch form a current-limiting loop, and comprises the following steps:
s1, disconnecting the fourth switch, and executing the step S2;
s2, detecting the current of the third switch, if the current of the third switch is equal to the current setting value of the third switch, disconnecting the third switch, and executing the step S3;
and S3, detecting the current of the first switch, and if the current of the first switch is equal to the current setting value of the first switch, disconnecting the first switch, and removing the fault of the overhead line.
2. The 10kV overhead line inter-phase fault level difference protection method according to claim 1, wherein in S2, if the current of the third switch is smaller than the current setting value of the third switch, the fault of the overhead line is cut off.
3. The 10kV overhead line inter-phase fault level difference protection method according to claim 1, wherein in S3, if the current of the first switch is smaller than the current setting value of the first switch, the fault of the overhead line is removed.
4. The 10kV overhead line inter-phase fault level difference protection method according to claim 1, further comprising a fast switch for fast disconnecting a line as the second switch.
5. The 10kV overhead line inter-phase fault level difference protection method according to claim 1, wherein the current limiting loop is used for limiting fault current of the overhead line in fault.
6. The 10kV overhead line inter-phase fault level difference protection method according to claim 1, wherein the first switch, the second switch, the third switch and the fourth switch are sequentially connected in series, and different opening or closing times are set on the first switch, the second switch, the third switch and the fourth switch.
7. A10 kV overhead line interphase fault level difference protection system comprises an overhead line and a transformer substation connected with the overhead line, wherein a first switch is arranged in the transformer substation, and at least a second switch, a third switch and a fourth switch are arranged on the overhead line;
the first execution unit is used for switching off the fourth switch;
the second execution unit is used for detecting the current of the third switch based on the first execution unit and opening the third switch according to the fact that the current of the third switch is equal to the current setting value of the third switch;
and the third execution unit is used for detecting the current of the first switch based on the second execution unit, and disconnecting the first switch according to the fact that the current of the first switch is equal to the current setting value of the first switch, so that the fault of the overhead line is removed.
8. The 10kV overhead line inter-phase fault level difference protection system according to claim 7, wherein the second execution unit is further configured to remove the fault of the overhead line according to that the current of the third switch is smaller than the current setting value of the third switch; the third execution unit is further used for cutting off the fault of the overhead line according to the fact that the current of the first switch is smaller than the current setting value of the first switch.
9. A computer readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the 10kV overhead line inter-phase fault level difference protection method of any of claims 1-6.
10. A terminal device, comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the 10kV overhead line inter-phase fault level difference protection method according to any one of claims 1 to 6 according to instructions in the program code.
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| CN113725825A (en) * | 2021-04-19 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of power supply system |
| CN113765053A (en) * | 2020-12-12 | 2021-12-07 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit |
| CN113949043A (en) * | 2020-12-17 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of power supply system |
| CN113949045A (en) * | 2021-06-30 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Method for eliminating interphase short circuit of three-phase power system |
| CN113949033A (en) * | 2020-12-17 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of three-phase power supply system |
| CN113949046A (en) * | 2021-06-30 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of three-phase power system |
| CN113949044A (en) * | 2021-02-02 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Three-phase non-effective grounding power supply system |
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| CN113949046A (en) * | 2021-06-30 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of three-phase power system |
| CN113949045A (en) * | 2021-06-30 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Method for eliminating interphase short circuit of three-phase power system |
| CN113949046B (en) * | 2021-06-30 | 2023-12-15 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of three-phase power system |
| CN113949045B (en) * | 2021-06-30 | 2024-02-09 | 保定钰鑫电气科技有限公司 | Method for eliminating interphase short circuit of three-phase power system |
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