CN111077362A - Method and system for online monitoring running state of reactor in capacitor assembly - Google Patents
Method and system for online monitoring running state of reactor in capacitor assembly Download PDFInfo
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Abstract
The invention relates to an on-line monitoring method and system for the running state of a reactor in a capacitor complete device, belonging to the technical field of on-line monitoring of transformer substation equipment; the method comprises the steps that S1 begins, S2 obtains the phase phi U1 of a voltage signal of the reactor and the phase phi I of a secondary side current signal of a current transformer of the outgoing line switch cabinet of the power capacitor complete device, S3 calculates the change rate of a power factor angle of the reactor and the power factor angle rated value of the reactor according to the obtained data, and S4 judges the operation state of the dry type hollow series reactor in the power capacitor complete device according to the change rate of the power factor angle; the system comprises a voltage acquisition module, a current acquisition module, a signal processing module and a logic analysis module; the defect of poor reliability in the power interruption detection in the prior art is overcome, and the working safety of the dry-type hollow series reactor and the power capacitor complete device is greatly improved.
Description
Technical Field
The invention relates to an on-line monitoring method and system for the running state of a reactor in a capacitor complete device, and belongs to the technical field of on-line monitoring of substation equipment.
Background
With the increase of inductive load of the power system, the reactive power demand of the system is higher and higher. In reactive power compensation devices in China, the power capacitor complete sets are most economical in quantity, and play a good role in the aspects of safe and stable operation of a power system, improvement of electric energy quality, reduction of network loss, improvement of power transmission and distribution capacity and the like. In order to suppress the amplification of higher harmonics of a power grid caused by the input of a power capacitor and limit the switching-on inrush current of the capacitor, a series reactor with a certain reactance rate is often input into a power capacitor complete set, wherein a dry type hollow series reactor (hereinafter referred to as a reactor) is widely applied to a power capacitor complete set due to the advantages of good linearity, small loss, low noise, high mechanical strength, convenience in maintenance and the like.
Due to reasons such as design, manufacture, operation, maintenance and use environment, the reactor often has certain faults, wherein turn-to-turn short circuit faults account for the first of all fault types. When the reactor has turn-to-turn short circuit fault, the short circuit turns form a closed loop under the action of electromagnetic induction, and after the closed loop is coupled with other normal coils, a large short circuit current can be generated in the short circuit turns. The temperature of the coil near the short-circuit position will rise sharply under the effect of the short-circuit current, which accelerates the aging of the insulating material near the short-circuit turn, and then expands to multi-turn short-circuit fault. The vicious circle enables the short-circuit fault to be continuously developed, and finally, the accident that the reactor is burnt out due to fire can be caused.
The power factor angle of the reactor is an important index for marking the basic performance and the state of the reactor, can reflect the quality of manufacturing process and raw materials and the state and the level of safe operation, and is particularly important for monitoring the operation state of the reactor. In the prior art, when the reactor is tested, the power-off measurement is needed, and because the reactor is not in a working state after the power-off, the obtained result cannot reflect the running state of the reactor, the reliability of the obtained measurement result is poor, and the hidden danger of the fault is greatly increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the method and the system for monitoring the running state of the reactor in the capacitor complete device on line are provided, the defect of poor reliability in the power interruption detection in the prior art is overcome, and the working safety of the dry-type hollow series reactor and the power capacitor complete device is greatly improved.
The invention discloses an on-line monitoring method for the running state of a reactor in a capacitor complete device, which comprises the following steps:
step S1, start;
step S2, acquiring data: obtaining a phase phi U1 of a voltage signal of the reactor and a phase phi I of a current signal of a secondary side of a current transformer of the power capacitor complete equipment outlet switch cabinet;
step S3, calculating a power factor angle change rate: calculating the change rate of the power factor angle of the reactor and the rated value of the power factor angle of the reactor according to the acquired data;
step S4, determining the operating state: and judging the running state of the dry type hollow series reactor in the power capacitor complete device according to the power factor angle change rate.
Preferably, step S4 includes:
step S401, if the power factor angle change rate is larger than 10%, the working state of the reactor is in an abnormal state, step S402 is executed, otherwise step S403 is executed;
step S402, alarming;
in step S403, the power capacitor plant continues to operate.
Here, the alarm in step S402 may be an alarm signal and/or a trip command to a circuit breaker in a switch cabinet thereof, and the trip command is issued to exit the device.
Preferably, step S2 includes:
step S201, obtaining a secondary side voltage signal U of a bus voltage transformer of a transformer substation where a power capacitor complete device is located and a secondary side voltage signal Uc of a power capacitor discharge coil;
step S202, calculating the operating voltage U1 of the reactor according to the Ul-Uc-U;
step S203, calculating the phase phi U1 of the reactor operation voltage signal;
step S204, obtaining a current signal I of a secondary side of a current transformer of an outgoing line switch cabinet of the power capacitor complete device;
and S205, calculating the phase phi I of the secondary side current signal of the outgoing line switch cabinet current transformer of the power capacitor complete device.
Preferably, step S3 includes:
step S301, calculating a power factor angle phi of the reactor according to the phi is equal to phi U1-phi I;
and step S302, obtaining the power factor angle change rate by the ratio of the power factor angle phi to the rated value of the reactor power factor angle.
Preferably, the alarm mode in step S402 is an audible and visual alarm.
The invention relates to an on-line monitoring system for the running state of a reactor in a capacitor complete device, which is used for executing the on-line monitoring method for the running state of the reactor in the capacitor complete device.
The method comprises the steps that firstly, a voltage signal U and a secondary side voltage Uc of a power capacitor discharge coil are obtained through a voltage acquisition module at the secondary side of a bus voltage transformer of a transformer substation where a power capacitor complete device is located, meanwhile, a current signal I of the secondary side of a current transformer of an outgoing line switch cabinet of the power capacitor complete device is obtained through a current acquisition module, a signal processing module processes parameters acquired by the current acquisition module and the voltage acquisition module and sends the parameters into a logic analysis module, and the logic analysis module further operates current signals and voltage signals sent by the voltage acquisition module and the current acquisition module. And the logic analysis module calculates the change rate of the power factor angle, judges the running state of the reactor according to the change rate of the power factor angle of the reactor, and sends out an alarm signal or sends out a tripping command to a breaker in a switch cabinet if the change rate of the power factor angle is more than 10 percent, otherwise, the power capacitor complete device continues to run without other operations.
Preferably, the device further comprises an audible and visual alarm module, and the output end of the logic analysis module is connected with the audible and visual alarm module.
Preferably, the voltage acquisition module is used for acquiring a secondary side voltage signal U of a bus voltage transformer of a substation where the power capacitor complete set is located and a secondary side voltage signal Uc of a power capacitor discharge coil, and the current acquisition module is used for acquiring a current signal I in an operation loop of the power capacitor complete set.
Preferably, the voltage acquisition module comprises a first voltage acquisition unit and a second voltage acquisition unit, the input end of the first voltage acquisition unit is connected with the secondary side of a voltage transformer of a substation bus of the power capacitor complete device, and the acquisition module is used for acquiring a secondary side voltage signal U of the voltage transformer of the substation bus where the power capacitor complete device is located; the input end of the second voltage acquisition unit is connected with the secondary side of the power capacitor discharge coil and is used for acquiring a secondary side voltage signal Uc of the power capacitor discharge coil.
Preferably, the logic analysis module comprises an operating voltage calculation unit, a phase calculation unit for a voltage signal, a phase calculation unit for a current signal, a power factor angle calculation unit, the input end of the operation voltage calculation unit is connected with the output end of the signal processing module, the output end of the operation voltage calculation unit is connected with the input end of the phase calculation unit of the voltage signal, the output end of the phase calculation unit of the voltage signal is connected with the input end of the power factor angle calculation unit, the input end of the phase calculation unit of the current signal is connected with the output end of the signal processing module, the output end of the phase calculation unit of the current signal is connected with the input end of the power factor angle calculation unit, the output end of the power factor angle calculation unit is connected with the input end of the power factor angle change rate calculation unit, the output end of the power factor angle change.
Compared with the prior art, the invention has the following beneficial effects:
compared with the existing detection method, the online monitoring method for the running state of the reactor in the capacitor complete device has the advantages that the reactor is in normal work, the conventional measurement method needs to measure the reactor in the power failure state of the power capacitor complete device, the applied measurement voltage is generally low, no load current passes through a reactor loop, no heating phenomenon exists, and the actual running state of the reactor is difficult to reflect. The method is characterized in that the power capacitor complete device is measured under the actual operation condition, the operation state of the power capacitor complete device can be truly reflected, the power factor angle of the three-phase reactor can be monitored on line, the reliability and the comparability of the measurement result are higher, and the defects of equipment which cannot be discovered under low voltage can be discovered. If the power factor angle change rate is obviously increased, an alarm signal is sent immediately or a tripping command is sent to a circuit breaker in a switch cabinet of the power factor angle change rate, the device is quitted from running, and accidents of the power capacitor complete device are prevented. The defect of poor reliability in the power interruption detection in the prior art is overcome, and the working safety of the dry-type hollow series reactor and the power capacitor complete device is greatly improved.
The reactor running state on-line monitoring system in the capacitor complete equipment realizes real-time monitoring of the reactor power factor angle under the condition that a reactor terminal voltage transformer is not added, can master the actual insulation state of the reactor, whether turn-to-turn short circuit exists and the like by comparing the change conditions of the reactor, immediately sends an alarm when the reactor breaks down, and reminds operation and maintenance personnel to carry out subsequent inspection or replacement on the reactor state. The defect of poor reliability in the power interruption detection in the prior art is overcome, and the working safety of the dry-type hollow series reactor and the power capacitor complete device is greatly improved.
Drawings
FIG. 1 is a flow chart of an online monitoring method for the running state of a reactor in a capacitor complete set device according to the invention;
fig. 2 is a structural block diagram of an on-line monitoring system for the running state of a reactor in the capacitor complete set device.
Wherein: 1. a voltage acquisition module; 101. a first voltage acquisition unit; 102. a second voltage acquisition unit; 2. a current collection module; 3. a signal processing module; 4. a logic analysis module; 401. an operating voltage calculation unit; 402. a phase calculation unit of the voltage signal; 403. a phase calculation unit of the current signal; 404. a power factor angle calculation unit; 405. a power factor angle change rate calculation unit; 406. a comparison unit; 5. and a sound and light alarm module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the method for online monitoring the operation state of the reactor in the capacitor complete set of equipment comprises the following steps:
step S1, start;
step S2, acquiring data: obtaining a phase phi U1 of a voltage signal of the reactor and a phase phi I of a current signal of a secondary side of a current transformer of the power capacitor complete equipment outlet switch cabinet;
step S3, calculating a power factor angle change rate: calculating the change rate of the power factor angle of the reactor and the rated value of the power factor angle of the reactor according to the acquired data;
step S4, determining the operating state: and judging the running state of the dry type hollow series reactor in the power capacitor complete device according to the power factor angle change rate.
Wherein, step S4 includes:
step S401, if the power factor angle change rate is larger than 10%, the working state of the reactor is in an abnormal state, step S402 is executed, otherwise step S403 is executed;
step S402, alarming;
in step S403, the power capacitor plant continues to operate.
Here, the alarm in step S402 may be an alarm signal and/or a trip command to a circuit breaker in a switch cabinet thereof, and the trip command is issued to exit the device.
Wherein, step S2 includes:
step S201, obtaining a secondary side voltage signal U of a bus voltage transformer of a transformer substation where a power capacitor complete device is located and a secondary side voltage signal Uc of a power capacitor discharge coil;
step S202, calculating the operating voltage U1 of the reactor according to the Ul-Uc-U;
step S203, calculating the phase phi U1 of the reactor operation voltage signal;
step S204, obtaining a current signal I of a secondary side of a current transformer of an outgoing line switch cabinet of the power capacitor complete device;
and S205, calculating the phase phi I of the secondary side current signal of the outgoing line switch cabinet current transformer of the power capacitor complete device.
Wherein, step S3 includes:
step S301, calculating a power factor angle phi of the reactor according to the phi is equal to phi U1-phi I;
and step S302, obtaining the power factor angle change rate by the ratio of the power factor angle phi to the rated value of the reactor power factor angle.
Wherein, the alarm mode in step S402 is an audible and visual alarm.
Example 2
As shown in fig. 2, the system for online monitoring of the operating state of the reactor in the capacitor complete set device is used for performing the method for online monitoring of the operating state of the reactor in the capacitor complete set device in embodiment 1, and includes a voltage acquisition module 1, a current acquisition module 2, a signal processing module 3, and a logic analysis module 4, wherein an input end of the voltage acquisition module 1 is connected to a secondary side of a voltage transformer of a substation bus of the power capacitor complete set device and a secondary side of a discharge coil of the power capacitor, the current acquisition module 2 is connected to a secondary side of a current transformer of an outgoing line switch cabinet of the power capacitor complete set device, output ends of the current acquisition module 2 and the voltage acquisition module 1 are connected to an input end of the signal processing module 3, and an output end of the signal processing module 3.
Firstly, a voltage signal U and a secondary side voltage Uc of a power capacitor discharge coil are obtained through a voltage acquisition module 1, and meanwhile, a current signal I of a secondary side of a current transformer of a power capacitor complete equipment outgoing line switch cabinet is obtained through a current acquisition module 2, a signal processing module 3 processes parameters acquired by the current acquisition module 2 and the voltage acquisition module 1 and sends the parameters into a logic analysis module 4, and the logic analysis module 4 further operates current signals and voltage signals sent by the voltage acquisition module 1 and the current acquisition module 2. The logic analysis module 4 calculates the power factor angle change rate and judges the running state of the reactor according to the power factor angle change rate of the reactor, if the power factor angle change rate is larger than 10%, an alarm signal is sent out, or a tripping command is sent out to a breaker in a switch cabinet of the power factor angle change rate, otherwise, other operations are not executed, and the power capacitor complete device continues to run.
The system for monitoring the running state of the reactor in the capacitor complete equipment further comprises an audible and visual alarm module 5, wherein the output end of the logic analysis module 4 is connected with the audible and visual alarm module 5
The voltage acquisition module 1 is used for acquiring a secondary side voltage signal U of a bus voltage transformer of a transformer substation where the power capacitor complete device is located and a secondary side voltage signal Uc of a power capacitor discharge coil, and the current acquisition module 2 is used for acquiring a current signal I in an operation loop of the power capacitor complete device.
The voltage acquisition module 1 comprises a first voltage acquisition unit 101 and a second voltage acquisition unit 102, wherein the input end of the first voltage acquisition unit 101 is connected with the secondary side of a voltage transformer of a substation bus of the power capacitor complete device, and the acquisition module is used for acquiring a secondary side voltage signal U of the voltage transformer of the substation bus where the power capacitor complete device is located; the input end of the second voltage acquisition unit 102 is connected to the secondary side of the power capacitor discharge coil and is used for acquiring a secondary side voltage signal Uc of the power capacitor discharge coil.
Wherein, the logic analysis module 4 comprises an operation voltage calculation unit 401, a voltage signal phase calculation unit 402, a current signal phase calculation unit 403, a power factor angle calculation unit 404, a power factor angle change rate calculation unit 405, and a comparison unit 406, wherein the input end of the operation voltage calculation unit 401 is connected with the output end of the signal processing module 3, the output end is connected with the input end of the voltage signal phase calculation unit 402, the output end of the voltage signal phase calculation unit 402 is connected with the input end of the power factor angle calculation unit 404, the input end of the current signal phase calculation unit 403 is connected with the output end of the signal processing module 3, the output end is connected with the input end of the power factor angle calculation unit 404, the output end of the power factor angle calculation unit 404 is connected with the input end of the power factor angle change rate calculation unit 405, the output end of the power, the output end of the comparison unit 406 is connected with the sound and light alarm module 5.
Here, the signal processing module 3 processes the parameters acquired by the current acquisition module 2 and sends the parameters to the phase calculation unit 403 of the current signal, and the signal processing module 3 processes the parameters acquired by the voltage acquisition module 1 and sends the parameters to the operating voltage calculation unit 401.
The working process and the working principle are as follows:
when the on-line monitoring system for the running state of the reactor in the capacitor complete device is used for monitoring the working state of the reactor, firstly, a voltage signal U and a secondary side voltage Uc of a power capacitor discharge coil of a transformer substation bus voltage transformer where the power capacitor complete device is located are obtained through the voltage acquisition module 1, meanwhile, a current signal I of a secondary side of a power capacitor complete device outgoing line switch cabinet current transformer is obtained through the current acquisition module 2, the signal processing module 3 processes parameters acquired by the current acquisition module 2 and the voltage acquisition module 1 and sends the parameters into the logic analysis module 4, and the logic analysis module 4 further operates the current signal and the voltage signal sent by the voltage acquisition module 1 and the current acquisition module 2.
In the logic analysis module 4, a voltage calculation unit 401 calculates a phase calculation unit 402 of an input voltage signal of an operating voltage U1 of the reactor according to Ul-Uc-U; the phase calculation unit 402 of the voltage signal calculates the voltage phase phi U1 of the reactor, and the phase calculation unit 403 of the current signal calculates the current phase phi I of the reactor; the power factor angle calculation unit 404 calculates a power factor angle Φ of the reactor from Φ ═ Φ U1- Φ I; the power factor angle change rate calculation unit 405 obtains a power factor angle change rate by comparing the power factor angle phi with a rated value of the reactor power factor angle; the comparison unit 406 judges the operation state of the reactor according to the change rate of the power factor angle of the reactor, and if the change rate of the power factor angle is greater than 10%, the acousto-optic alarm module 5 is driven to perform acousto-optic alarm, otherwise, other operations are not executed, and the power capacitor complete device continues to operate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An on-line monitoring method for the running state of a reactor in a capacitor complete device is characterized by comprising the following steps:
step S1, start;
step S2, acquiring data: obtaining a phase phi U1 of a voltage signal of the reactor and a phase phi I of a current signal of a secondary side of a current transformer of the power capacitor complete equipment outlet switch cabinet;
step S3, calculating a power factor angle change rate: calculating the change rate of the power factor angle of the reactor and the rated value of the power factor angle of the reactor according to the acquired data;
step S4, determining the operating state: and judging the running state of the dry type hollow series reactor in the power capacitor complete device according to the power factor angle change rate.
2. The method for online monitoring the operation state of the reactor in the capacitor assembly according to claim 1, wherein the step S4 comprises:
step S401, if the power factor angle change rate is larger than 10%, the working state of the reactor is in an abnormal state, step S402 is executed, otherwise step S403 is executed;
step S402, alarming;
in step S403, the power capacitor plant continues to operate.
3. The method for online monitoring the operation state of the reactor in the capacitor assembly according to claim 1, wherein the step S2 comprises:
step S201, obtaining a secondary side voltage signal U of a bus voltage transformer of a transformer substation where a power capacitor complete device is located and a secondary side voltage signal Uc of a power capacitor discharge coil;
step S202, calculating the operating voltage U1 of the reactor according to the Ul-Uc-U;
step S203, calculating the phase phi U1 of the reactor operation voltage signal;
step S204, obtaining a current signal I of a secondary side of a current transformer of an outgoing line switch cabinet of the power capacitor complete device;
and S205, calculating the phase phi I of the secondary side current signal of the outgoing line switch cabinet current transformer of the power capacitor complete device.
4. The method for online monitoring the operation state of the reactor in the capacitor assembly according to claim 1, wherein the step S3 comprises:
step S301, calculating a power factor angle phi of the reactor according to the phi is equal to phi U1-phi I;
and step S302, obtaining the power factor angle change rate by the ratio of the power factor angle phi to the rated value of the reactor power factor angle.
5. The method for on-line monitoring the operating state of the reactor in the capacitor assembly according to claim 2, wherein the alarm mode in step S402 is an audible and visual alarm.
6. An on-line monitoring system for the operation state of the reactor in the capacitor complete set, which is used for executing the on-line monitoring method for the operation state of the reactor in the capacitor complete set as claimed in claims 1-5, the intelligent transformer substation is characterized by comprising a voltage acquisition module (1), a current acquisition module (2), a signal processing module (3), a logic analysis module (4), wherein the input end of the voltage acquisition module (1) is connected with the secondary side of a voltage transformer of a power capacitor complete set device substation bus and the secondary side of a power capacitor discharge coil, the current acquisition module (2) is connected with the secondary side of a current transformer of a power capacitor complete set device outgoing line switch cabinet, the output ends of the current acquisition module (2) and the voltage acquisition module (1) are connected with the input end of the signal processing module (3), and the output end of the signal processing module (3) is connected with the input end of the logic analysis module (4).
7. The on-line monitoring system for the running state of the reactor in the capacitor assembly according to claim 6, characterized by further comprising an audible and visual alarm module (5), wherein the output end of the logic analysis module (4) is connected with the audible and visual alarm module (5).
8. The system for monitoring the running state of the reactor in the capacitor complete set according to the claim 6 or 7, characterized in that the voltage acquisition module (1) is used for acquiring a secondary side voltage signal U of a bus voltage transformer of a transformer substation where the power capacitor complete set is located and a secondary side voltage signal Uc of a discharge coil of the power capacitor, and the current acquisition module (2) is used for acquiring a current signal I in a running loop of the power capacitor complete set.
9. The system for monitoring the running state of the reactor in the capacitor complete set according to claim 8, wherein the voltage acquisition module (1) comprises a first voltage acquisition unit (101) and a second voltage acquisition unit (102), the input end of the first voltage acquisition unit (101) is connected with the secondary side of a voltage transformer of a substation bus of the power capacitor complete set, and the acquisition module is used for acquiring a secondary side voltage signal U of the voltage transformer of the substation bus where the power capacitor complete set is located; the input end of the second voltage acquisition unit (102) is connected with the secondary side of the power capacitor discharge coil and is used for acquiring a secondary side voltage signal Uc of the power capacitor discharge coil.
10. The system for online monitoring of the operating state of the reactor in the capacitor assembly according to claim 9, wherein the logic analysis module (4) comprises an operating voltage calculation unit (401), a phase calculation unit (402) for a voltage signal, a phase calculation unit (403) for a current signal, a power factor angle calculation unit (404), a power factor angle change rate calculation unit (405), and a comparison unit (406), wherein an input end of the operating voltage calculation unit (401) is connected with an output end of the signal processing module (3), an output end of the operating voltage calculation unit is connected with an input end of the phase calculation unit (402) for the voltage signal, an output end of the phase calculation unit (402) for the voltage signal is connected with an input end of the power factor angle calculation unit (404), an input end of the phase calculation unit (403) for the current signal is connected with an output end of the signal processing module (3), and an output end of, the output end of the power factor angle calculation unit (404) is connected with the input end of the power factor angle change rate calculation unit (405), the output end of the power factor angle change rate calculation unit (405) is connected with the input end of the comparison unit (406), and the output end of the comparison unit (406) is connected with the acousto-optic alarm module (5).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327076A (en) * | 2020-10-26 | 2021-02-05 | 国网山东省电力公司淄博供电公司 | Method for diagnosing running state of series dry type reactor based on tan delta difference |
| CN112394298A (en) * | 2020-12-01 | 2021-02-23 | 杭州沃伦森电气有限公司 | Method for detecting turn-to-turn short circuit of reactor |
| CN112666415A (en) * | 2020-12-18 | 2021-04-16 | 安徽链众电气科技有限公司 | Power capacitor on-line monitoring device |
| CN115840110A (en) * | 2023-02-13 | 2023-03-24 | 国网湖北省电力有限公司武汉供电公司 | Single-phase earth fault sensitive sensing method, system and storage medium |
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2019
- 2019-12-23 CN CN201911336530.2A patent/CN111077362A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327076A (en) * | 2020-10-26 | 2021-02-05 | 国网山东省电力公司淄博供电公司 | Method for diagnosing running state of series dry type reactor based on tan delta difference |
| CN112394298A (en) * | 2020-12-01 | 2021-02-23 | 杭州沃伦森电气有限公司 | Method for detecting turn-to-turn short circuit of reactor |
| CN112666415A (en) * | 2020-12-18 | 2021-04-16 | 安徽链众电气科技有限公司 | Power capacitor on-line monitoring device |
| CN115840110A (en) * | 2023-02-13 | 2023-03-24 | 国网湖北省电力有限公司武汉供电公司 | Single-phase earth fault sensitive sensing method, system and storage medium |
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