Analysis and Solution on Field Test Error of Unbalanced Current of High Voltage Capacitor

WU Peng; SHI Lei; ZHANG Yuan; TIAN Xiangyang

doi:10.14044/j.1674-1757.pcrpc.2019.05.003

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Analysis and Solution on Field Test Error of Unbalanced Current of High Voltage Capacitor

更新时间：2024-09-14

- Analysis and Solution on Field Test Error of Unbalanced Current of High Voltage Capacitor
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 40, Issue 5, Pages: 14-19(2019)
- 作者机构：
  
  1. 国网宁夏电力有限公司检修公司
  2. 2. 北京科瑞时代科技有限公司
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2019.05.003
  CLC： TM53
- Published：2019，
- 稿件说明：
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[1]吴鹏,史磊,张源,田向阳.高压电容器不平衡电流现场测试误差分析与解决[J].电力电容器与无功补偿,2019,40(05):14-19.

WU PENG, SHI LEI, ZHANG YUAN, et al. Analysis and Solution on Field Test Error of Unbalanced Current of High Voltage Capacitor. [J]. Power capacitor & reactive power compensation, 2019, 40(5): 14-19.
[1]吴鹏,史磊,张源,田向阳.高压电容器不平衡电流现场测试误差分析与解决[J].电力电容器与无功补偿,2019,40(05):14-19. DOI： 10.14044/j.1674-1757.pcrpc.2019.05.003.

WU PENG, SHI LEI, ZHANG YUAN, et al. Analysis and Solution on Field Test Error of Unbalanced Current of High Voltage Capacitor. [J]. Power capacitor & reactive power compensation, 2019, 40(5): 14-19. DOI： 10.14044/j.1674-1757.pcrpc.2019.05.003.

摘要

换流站高压电容器不平衡电流现场测试通常采用低压加压法

由微安表直接测量不平衡电流

这种方法受微安表内阻和现场电磁干扰影响较大

难以直接准确测量。本文针对不平衡电流现场测试误差大的原因进行了理论分析和仿真验证

并提出一种新的测量方法

将高压交流信号施加于电容器塔

通过测量桥臂不平衡电压

再由电容器塔等效阻抗计算出不平衡电流值。本文提出的新方法可以消除测量仪表内阻以及测试设备和现场电磁干扰对测量精度的影响。现场测试结果表明

新方法理论思路正确

可以有效提高不平衡电流值测量准确度。

Abstract

Low voltage application is usually used for field test of high voltage capacitor in converter station. Theunbalanced current is tested directly through the micro ammeter

which is influenced greatly by the internal resistance of micro ammeter and the electromagnetic interference in the field and is difficult to measure directly and accurately. In this paper

the cause for the large error in unbalanced current field measurement is analyzed theoretically and verified by simulation

a new measurement method is proposed

that is to apply the high voltage AC signal to the capacitor tower and calculate the unbalanced current by way of measuring the unbalanced voltage of the bridge arm and through the equivalent impedance of the capacitor tower. The new method proposed in this paper can eliminate the influence of inner resistance

the measurement equipment and interference at site on the accuracy. It is shown by the site test result that the new method has clear theoretical idea and can improve effectivelythe accuracy of unbalanced current measurement.

关键词

低压加压法高压电容器电磁干扰内阻不平衡电压不平衡电流

Keywords

low voltage applicationhigh voltage capacitorelectromagnetic interferenceinner resistanceunbalanced voltageunbalanced current

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