Analysis on Less than Zero of Dielectric Loss Test Result for Capacitor Divider in CVT

WU Hao; ZHAO Laijun

doi:10.14044/j.1674-1757.pcrpc.2014.02.016

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Analysis on Less than Zero of Dielectric Loss Test Result for Capacitor Divider in CVT

更新时间：2024-09-14

- Analysis on Less than Zero of Dielectric Loss Test Result for Capacitor Divider in CVT
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 35, Issue 2, Pages: 82-86(2014)
- 作者机构：
  
  1. 浙江省电力公司金华电业局
  2. 河南理工大学电气工程与自动化学院
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2014.02.016
  CLC： TM451.2
- Published：2014，
- 稿件说明：
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[1]吴昊,赵来军.一起CVT电容分压器介损测试结果小于零的原因分析[J].电力电容器与无功补偿,2014,35(02):82-86.

WU HAO, ZHAO LAIJUN. Analysis on Less than Zero of Dielectric Loss Test Result for Capacitor Divider in CVT. [J]. Power capacitor & reactive power compensation, 2014, 35(2): 82-86.
[1]吴昊,赵来军.一起CVT电容分压器介损测试结果小于零的原因分析[J].电力电容器与无功补偿,2014,35(02):82-86. DOI： 10.14044/j.1674-1757.pcrpc.2014.02.016.

WU HAO, ZHAO LAIJUN. Analysis on Less than Zero of Dielectric Loss Test Result for Capacitor Divider in CVT. [J]. Power capacitor & reactive power compensation, 2014, 35(2): 82-86. DOI： 10.14044/j.1674-1757.pcrpc.2014.02.016.

摘要

本文分析了一起典型110 kV CVT整组电容介损测试中出现"-tanδ"的异常情况。导致这一问题出现的原因是测试中补偿电抗器L两端的保护用MOA未被拆除

从而使得部分信号电流经MOA支路直接流入大地

改变了信号电流的相位。进一步的理论分析结果表明

在对该结构类型的CVT进行整组电容介损测试时普遍存在这一问题

需引起试验人员的注意。为了避免保护用MOA对CVT整组电容介损测试造成不良影响

建议在测试过程中将其拆除。

Abstract

In this paper

it is analyzed that the anomalies "tanδ"

which appeared in whole capacitance dielectric loss test of typical 110 kV CVT. The reason for such problem is to test the compensation reactor at both ends of the L protection with MOA have not been removed

thus keeping partial signal current flow directly into earth through MOA branch

circuit and changing phase of the signal current. It is shown by theoretical analysis result that such problem is common in case of dielectric loss test of complete set capacitance for such type of CVT

and test personnel should pay attention. For avoiding negative influence of MOA on complete set capacitance dielectric loss of CVT

it is suggested to remove the MOA during the dielectric loss test.

关键词

电容式电压互感器（CVT）整组电容介损金属氧化物避雷器（MOA）

Keywords

capacitor voltage transformer（CVT）set of capacitancetanδmetal oxide arrester（MOA）

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