CN-115856432-B - Device and method for detecting voltage phase of lightning arrester

CN115856432BCN 115856432 BCN115856432 BCN 115856432BCN-115856432-B

Abstract

The invention discloses a device and a method for detecting a voltage phase of a lightning arrester, which relate to the technical field of measurement electricity, wherein the device comprises a measurement module, the method comprises the steps of obtaining a voltage phase angle alpha of a transformer, namely a phase angle between a secondary voltage and a primary voltage of the transformer, obtaining an error phase angle beta of the transformer, namely a phase angle between the secondary voltage and the primary voltage of the transformer caused by manufacturing errors of the transformer, obtaining a compensation phase angle gamma of the transformer, wherein the compensation phase angle gamma comprises the voltage phase angle alpha and the error phase angle beta, obtaining the phase angle delta of the lightning arrester, namely the phase angle between the primary voltage and leakage current of the lightning arrester, which is obtained by measuring by adopting an overhaul power supply method, obtaining the voltage phase of the lightning arrester, wherein the voltage phase of the lightning arrester is equal to the phase angle delta of the lightning arrester plus the compensation phase angle gamma, and realizing more accurate measurement of the obtained voltage phase of the lightning arrester by the measurement module.

Inventors

LIU XIAOFEI
FU WEIPING
LI QIANG
LI JIANPENG
ZU SHUTAO
HU WEITAO
JIA XIAOYU

Assignees

国网河北省电力有限公司超高压分公司
国家电网有限公司

Dates

Publication Date: 20260505
Application Date: 20221031

Claims (10)

1. The device for detecting the voltage phase of the lightning arrester is characterized by comprising a measuring module, wherein the measuring module is a program module and is used for obtaining the voltage phase angle alpha of a transformer, namely the phase angle between the secondary voltage and the primary voltage of the transformer, obtaining the error phase angle beta of the transformer, namely the phase angle between the secondary voltage and the primary voltage of the transformer caused by manufacturing errors of the transformer, obtaining the compensation phase angle gamma of the transformer, wherein the compensation phase angle gamma comprises the voltage phase angle alpha and the error phase angle beta, obtaining the phase angle delta of the lightning arrester, namely the phase angle between the primary voltage and leakage current of the lightning arrester, obtained by measuring by adopting an overhaul power supply method, and obtaining the voltage phase of the lightning arrester, wherein the voltage phase delta of the lightning arrester is equal to the phase angle delta of the lightning arrester plus the compensation phase angle gamma.
2. An apparatus for detecting the phase of a lightning arrester voltage according to claim 1, wherein the voltage phase angle α is the phase angle of the secondary voltage of the transformer after or earlier than the primary voltage.
3. An apparatus for detecting a lightning arrester voltage phase according to claim 1, wherein the voltage phase angle α comprises a voltage phase angle α1 of a first transformer and a voltage phase angle α2 of a second transformer, the error phase angle β comprises an error phase angle β1 of the first transformer and an error phase angle β2 of the second transformer, the compensated phase angle γ of the transformers comprises a compensated phase angle γ1 of the first transformer and a compensated phase angle γ2 of the second transformer, the compensated phase angle γ1 of the first transformer is a sum of the voltage phase angle α1 of the first transformer and the error phase angle β1 of the first transformer, and the compensated phase angle γ2 of the second transformer is a sum of the voltage phase angle α2 of the second transformer and the error phase angle β2 of the second transformer.
4. The device for detecting the phase of a lightning arrester voltage according to claim 1, wherein the voltage phase angle α is a voltage phase angle α2 of the second transformer, the error phase angle β is an error phase angle β2 of the second transformer, the compensated phase angle γ of the transformer is a compensated phase angle γ2 of the second transformer, and the compensated phase angle γ2 of the second transformer is a sum of the voltage phase angle α2 of the second transformer and the error phase angle β2 of the second transformer.
5. The device for detecting the voltage phase of the lightning arrester according to claim 1, further comprising a lightning arrester leakage current tester for obtaining a phase angle delta of the lightning arrester and an angle difference ratio tester for obtaining a phase angle beta of a transformer, wherein the lightning arrester leakage current tester is connected with and communicates with the angle difference ratio tester, the measuring module is operated on a controller of the lightning arrester leakage current tester, and the measuring module is further used for obtaining the voltage phase angle alpha of the transformer by the lightning arrester leakage current tester, obtaining the phase angle beta of the transformer by the angle difference ratio tester and sending the error phase angle beta of the transformer to the lightning arrester leakage current tester, obtaining the compensation phase angle gamma of the transformer by the lightning arrester leakage current tester, obtaining the phase angle delta of the lightning arrester and obtaining the voltage phase of the lightning arrester.
6. A method for detecting the phase of the voltage of a lightning arrester is characterized by comprising the steps of measuring, obtaining the voltage phase angle alpha of a transformer, namely the phase angle between the secondary voltage and the primary voltage of the transformer, obtaining the error phase angle beta of the transformer, namely the phase angle between the secondary voltage and the primary voltage of the transformer caused by manufacturing errors of the transformer, obtaining the compensation phase angle gamma of the transformer, wherein the compensation phase angle gamma comprises the voltage phase angle alpha and the error phase angle beta, obtaining the phase angle delta of the lightning arrester, namely the phase angle between the primary voltage and leakage current of the lightning arrester, obtained by measuring by adopting an overhaul power supply method, and obtaining the voltage phase of the lightning arrester, wherein the voltage phase of the lightning arrester is equal to the phase angle delta of the lightning arrester plus the compensation phase angle gamma.
7. A method for detecting a phase of a lightning arrester voltage according to claim 6, wherein the lightning arrester leakage current tester is connected to and communicates with the angle difference ratio tester based on the lightning arrester leakage current tester for obtaining a phase angle delta of the lightning arrester and the angle difference ratio tester for obtaining a phase angle delta of the transformer, and in the measuring step the lightning arrester leakage current tester obtains a phase angle alpha of the transformer, the angle difference ratio tester obtains a phase angle beta of the transformer and sends the phase angle beta of the transformer to the lightning arrester leakage current tester, the lightning arrester leakage current tester obtains a compensation phase angle gamma of the transformer, obtains a phase angle delta of the lightning arrester, and obtains a phase angle delta of the lightning arrester voltage.
8. A method for detecting a lightning arrester voltage phase according to claim 7, wherein in the step of measuring, the lightning arrester leakage current tester obtains a voltage phase angle α of the transformer to obtain the voltage phase angle α of the transformer and logs the voltage phase angle α into the lightning arrester leakage current tester.
9. An apparatus for detecting the phase of a lightning arrester voltage, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the corresponding steps of the method according to any one of claims 6 to 8 when the computer program is executed by the processor.
10. An apparatus for detecting the phase of a lightning arrester voltage comprises a computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the respective steps of the method of any of claims 6 to 8.

Description

Device and method for detecting voltage phase of lightning arrester Technical Field The invention relates to the technical field of measurement electricity, in particular to a device and a method for detecting the voltage phase of a lightning arrester. Background The leakage current test of the lightning arrester can effectively find out whether the interior of the lightning arrester is affected with damp, whether the metal oxide valve plate is deteriorated or not, and the included angle between the primary voltage of the lightning arrester and the leakage current is an important parameter for finding out whether the interior of the lightning arrester is affected with damp, and whether the valve plate is aged, namely, the lightning arrester is accurate and reliable. 1. Connection mode of equipment As shown in fig. 7, taking a 500kV substation as an example, the voltage of a conventional 500kV substation overhaul power supply box is obtained by transforming two groups of transformers, namely a transformer 1 and a transformer 2, the wiring group of the transformer 1 is YN d 11, the 500kV voltage is converted into two voltages, namely 220kV and 35kV, the primary side has two voltage levels of 500kV and 220kV, and the secondary side has a voltage level of 35 kV. The 220kV voltage is distributed to a 220kV transformer substation for use through a bus and a circuit, the 35kV voltage is connected with a transformer 2, the wiring group of the transformer 2 is Dyn 11, and the 35kV voltage is converted into 380V voltage for power utilization in the station, equipment power utilization and maintenance of a power supply box. As shown in fig. 1, the primary side of the transformer is a configuration of a star connection, which connects the ends of the three-phase windings together to form a neutral point, and leads out the terminals of the three-phase windings. As shown in fig. 2, the secondary side of the transformer is a star-shaped structure. As shown in fig. 3, the primary side of the transformer is a triangular wiring structure, and the triangular connection is to connect the three-phase windings end to end and to lead out the wiring terminals of the three-phase windings respectively. As shown in fig. 4, the secondary side of the transformer is a delta-shaped wiring structure. As shown in fig. 5 and 6, capital letters in the wiring groups indicate the wiring patterns on the primary side, and lowercase letters indicate the wiring patterns on the secondary side. In the connection group of the transformer, YN represents the connection of the star-shaped neutral line on the primary side, Y represents the star connection, N represents the neutral line on the belt, Y represents the star connection (without the neutral line) on the primary side, D represents the triangle connection on the primary side, YN represents the connection of the star-shaped neutral line on the secondary side, Y represents the star connection on the secondary side, N represents the neutral line on the secondary side, Y represents the star connection (without the neutral line) on the secondary side, and D represents the triangle connection on the secondary side. The latter numbers indicate that the line voltage (vector) phasors on the secondary side are at the point of the clock when the line voltage (vector) phasors on the primary side refer to the position at the point of the clock 12. For example, a common junction group of 500kV transformers is ynd 11, which represents a junction where the primary side of the transformer is a star-band neutral, the secondary side is a delta-junction, the primary side voltage (vector) vector is at 12 points, the secondary side voltage (vector) vector is at 11 points, the secondary side voltage is 30 ° -11=330° behind the primary side voltage or the secondary side voltage is 360 ° -30 ° -11=30° ahead of the primary side voltage. As shown in fig. 7, the distribution diagrams of the phase 1A, the phase 2A, the phase 3A, and the maintenance power box of the power system transformer are shown. The lightning arrester 1 is a lightning arrester connected with a lead wire on the primary side (500 kV side) of the transformer 1, the lightning arrester 2 is a lightning arrester connected with a lead wire on the primary side (220 kV side) of the transformer 1, and the lightning arrester 3 is a lightning arrester connected with a lead wire on the secondary side (35 kV side) of the transformer 1. T1 is a primary side high-voltage sleeve (line voltage 500 kV) of the transformer 1, T2 is a primary side medium-voltage sleeve (line voltage 220 kV) of the transformer 1, and T3 is a secondary side low-voltage sleeve (line voltage 35 kV) of the transformer 1. T4, T5 and T6 are high-voltage bushings (line voltage is 35 kV) on the primary side of the transformer 2, T7-T10 are low-voltage bushings on the secondary side of the transformer 2, T7 is a low-voltage neutral point bushing, T8 is a C-phase low-voltage bushing, T9 is a B-phase l