CN-121995165-A - Three-phase lightning arrester testing method, device, equipment, medium and program product

CN121995165ACN 121995165 ACN121995165 ACN 121995165ACN-121995165-A

Abstract

The embodiment of the application provides a three-phase lightning arrester testing method, a device, equipment, a medium and a program product. The method comprises the steps of obtaining reference voltage and full current of each phase of the three-phase lightning arrester, determining impedance angles of each phase of the three-phase lightning arrester, if charged bodies exist around the three-phase lightning arrester, constructing a phase interference model, correcting the impedance angles of each phase through step-by-step compensation based on the model, and judging the insulation performance of the three-phase lightning arrester according to the number relation between the corrected impedance angles and a preset threshold value. The phase interference model can represent the interference of interference sources such as the current of the charged body and the current of the target phase on the impedance angle, and the measured impedance angle is corrected in the mode, so that the influence of the impedance angle can be reduced, the real value of the impedance angle is more approximate, and the accuracy of judging the insulation performance of the three-phase lightning arrester according to the impedance angle can be improved.

Inventors

Huang Kaihao
LIN JINPENG
FANG WENTIAN
CHEN LINXI
CHEN HAOLIN
CHEN SHU
LIU YUKUAN
ZHENG QIYAN
YANG XIEWEI
CAI WEIJIE

Assignees

广东电网有限责任公司揭阳供电局

Dates

Publication Date: 20260508
Application Date: 20260114

Claims (10)

1. A method for testing a three-phase lightning arrester, comprising: Acquiring reference voltage and full current of each phase of the three-phase lightning arrester; Determining the impedance angle of each phase of the three-phase lightning arrester according to the reference voltage and the full current; In response to determining that a charged body exists around the three-phase lightning arrester, constructing a phase disturbance model that characterizes disturbances of the impedance angle by a plurality of disturbance sources, the plurality of disturbance sources including currents of the charged body and currents of a target phase in the three-phase lightning arrester, the target phase being one of the three phases that is between the other two phases; And correcting the impedance angle of each phase by step-by-step compensation based on the phase interference model, and judging the insulation performance of the three-phase lightning arrester according to the quantity relation between the corrected impedance angle and a preset impedance threshold value.
2. The method of claim 1, wherein the correcting the impedance angle of each phase by step-wise compensation based on the phase disturbance model comprises: determining a compensation amount corresponding to a target interference source in the phase interference model, and primarily correcting an impedance angle interfered by the target interference source, wherein the target interference source is the current of the charged body or the current of a target phase; And after the primary correction, determining compensation amounts corresponding to other interference sources in the phase interference model, and correcting impedance angles interfered by the other interference sources.
3. The method of claim 2, further comprising, after correcting the impedance angle of each phase by step-wise compensation: Recording each phase resistance angle after correction under the condition that the current of the charged body is a target interference source and the current of a target phase is other interference sources as a first type of impedance angle; Recording each corrected phase resistance angle as a second type impedance angle under the condition that the current of the target phase is a target interference source and the current of the charged body is other interference sources; For any one of the three phases, a weighted average of the first type of impedance angle and the second type of impedance angle is calculated as a corrected impedance angle.
4. The method according to claim 1, wherein the charged body is an a-phase bus and the target phase is a B-phase, the correcting the impedance angle of each phase by step-wise compensation based on the phase disturbance model includes: Calculating a first compensation amount according to the impedance angle of the B phase and the impedance angle of the C phase; Correcting the impedance angle of the B phase according to the first compensation quantity to obtain a corrected impedance angle of the B phase, and correcting the impedance angle of the C phase according to the first compensation quantity to obtain a C phase correction intermediate value; calculating a second compensation amount according to the impedance angle of the A phase and the C phase correction intermediate value; And respectively correcting the impedance angle of the A phase and the C phase correction intermediate value according to the second compensation quantity to obtain an impedance angle after the A phase correction and an impedance angle after the C phase correction.
5. The method according to claim 1, wherein the charged body is an a-phase bus and the target phase is a B-phase, the correcting the impedance angle of each phase by step-wise compensation based on the phase disturbance model includes: calculating a third compensation amount according to the impedance angle of the phase A and the impedance angle of the phase C; correcting the impedance angle of the phase A according to the third compensation quantity to obtain an impedance angle after phase A correction, and correcting the impedance angle of the phase C according to the third compensation quantity to obtain a phase C correction intermediate value; calculating a fourth compensation amount according to the impedance angle of the B phase and the C phase correction intermediate value; and respectively correcting the impedance angle of the B phase and the C phase correction intermediate value according to the fourth compensation quantity to obtain the impedance angle after the B phase correction and the impedance angle after the C phase correction.
6. The method according to any one of claims 1 to 5, wherein said correcting the impedance angle of each phase by step-wise compensation comprises: And calculating the difference value between the impedance angles of any two phases, and if the absolute value of the difference value between the impedance angle of one phase and the impedance angle of the other phases is larger than a preset target threshold value, keeping the impedance angle of the phase unchanged and correcting the impedance angles of the other two phases.
7. A three-phase arrester testing device, comprising: the acquisition module is used for acquiring the reference voltage and the full current of each phase of the three-phase lightning arrester; the impedance angle calculation module is used for determining the impedance angle of each phase of the three-phase lightning arrester according to the reference voltage and the full current; A model building module, configured to, in response to determining that a charged body exists around the three-phase lightning arrester, build a phase disturbance model that characterizes disturbances of the impedance angle by a plurality of disturbance sources, the plurality of disturbance sources including currents of the charged body and currents of a target phase in the three-phase lightning arrester, the target phase being one phase between other two phases among the three phases; And the correction module is used for correcting the impedance angle of each phase through step-by-step compensation based on the phase interference model, and judging the insulation performance of the three-phase lightning arrester according to the quantity relation between the corrected impedance angle and a preset impedance threshold value.
8. An electronic device comprising a processor and a memory communicatively coupled to the processor; The memory stores computer-executable instructions; The processor executes computer-executable instructions stored in the memory to implement the method of any one of claims 1 to 6.
9. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when executed, implements the method according to any one of claims 1 to 6.

Description

Three-phase lightning arrester testing method, device, equipment, medium and program product Technical Field The application relates to the technical field of power grid detection, in particular to a three-phase lightning arrester testing method, a device, equipment, a medium and a program product. Background The lightning arrester is core equipment for overvoltage protection in a power grid, and mainly bears the key tasks of limiting lightning overvoltage and operating overvoltage, and the state monitoring of the insulation performance is critical to the safety of the power grid. At present, the detection of the insulation performance of the lightning arrester mainly depends on two modes, namely a power failure test and a live test. The power failure test can increase equipment power failure time and power grid operation risk, and live test can be carried out under the condition that power grid equipment does not stop running, but under the live condition, the internal insulation state of the arrester is easy to be interfered by factors such as external environment, and the accuracy is insufficient, and the real insulation state of the arrester is difficult to reflect. Disclosure of Invention The embodiment of the application provides a three-phase lightning arrester testing method, a device, equipment, a medium and a program product, which are used for achieving the effect of improving the live test accuracy of a lightning arrester. In a first aspect, an embodiment of the present application provides a method for testing a three-phase lightning arrester, including: Acquiring reference voltage and full current of each phase of the three-phase lightning arrester; determining the impedance angle of each phase of the three-phase lightning arrester according to the reference voltage and the full current; In response to determining that a charged body exists around the three-phase lightning arrester, constructing a phase interference model, wherein the phase interference model characterizes interference of a plurality of interference sources on impedance angles, the plurality of interference sources comprise current of the charged body and current of a target phase in the three-phase lightning arrester, and the target phase is one phase between other two phases among the three phases; Based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, and the insulation performance of the three-phase lightning arrester is judged according to the quantity relation between the corrected impedance angle and the preset impedance threshold value. In one possible implementation, correcting the impedance angle of each phase by step-wise compensation based on the phase disturbance model includes: Determining a compensation quantity corresponding to a target interference source in a phase interference model, and primarily correcting an impedance angle interfered by the target interference source, wherein the target interference source is current of a charged body or current of a target phase; After the primary correction, the compensation quantity corresponding to the rest of interference sources in the phase interference model is determined, and the impedance angle interfered by the rest of interference sources is corrected. In one possible implementation, after the impedance angle of each phase is corrected by step compensation, the method further includes: Recording each phase resistance angle after correction as a first type of impedance angle under the condition that the current of the charged body is a target interference source and the current of the target phase is other interference sources; recording each corrected phase resistance angle as a second type impedance angle under the condition that the current of the target phase is a target interference source and the current of the charged body is other interference sources; For any one of the three phases, a weighted average of the first type of impedance angle and the second type of impedance angle is calculated as the corrected impedance angle. In one possible implementation, the charged body is an a-phase busbar, the target phase is a B-phase, and the impedance angle of each phase is corrected by step-by-step compensation based on a phase disturbance model, including: Calculating a first compensation amount according to the impedance angle of the B phase and the impedance angle of the C phase; Correcting the impedance angle of the B phase according to the first compensation quantity to obtain the corrected impedance angle of the B phase, and correcting the impedance angle of the C phase according to the first compensation quantity to obtain a C phase correction intermediate value; calculating a second compensation amount according to the impedance angle of the phase A and the C phase correction intermediate value; and respectively correcting the impedance angle of the A phase and the C phase correction int