Study on Harmonic Measurement Method of Capacitor Voltage Transformer

WANG Ling; FENG Yu; YANG Liu; DAI Shuangyin; MAO Anlan; LI Xuan; YANG Fan

doi:10.14044/j.1674-1757.pcrpc.2021.01.016

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Study on Harmonic Measurement Method of Capacitor Voltage Transformer

更新时间：2024-09-14

- Study on Harmonic Measurement Method of Capacitor Voltage Transformer
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 42, Issue 1, Pages: 95-100(2021)
- 作者机构：
  
  1. 中国电力科学研究院有限公司
  2. 国家电网有限公司
  3. 国网河南省电力公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2021.01.016
  CLC： TM451
- Published：2021，
- 稿件说明：
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[1]王玲,冯宇,杨柳,代双寅,毛安澜,李璿,杨帆.电容式电压互感器谐波测量方法研究[J].电力电容器与无功补偿,2021,42(01):95-100+107.

WANG LING, FENG YU, YANG LIU, et al. Study on Harmonic Measurement Method of Capacitor Voltage Transformer. [J]. Power capacitor & reactive power compensation, 2021, 42(1): 95-100.
[1]王玲,冯宇,杨柳,代双寅,毛安澜,李璿,杨帆.电容式电压互感器谐波测量方法研究[J].电力电容器与无功补偿,2021,42(01):95-100+107. DOI： 10.14044/j.1674-1757.pcrpc.2021.01.016.

WANG LING, FENG YU, YANG LIU, et al. Study on Harmonic Measurement Method of Capacitor Voltage Transformer. [J]. Power capacitor & reactive power compensation, 2021, 42(1): 95-100. DOI： 10.14044/j.1674-1757.pcrpc.2021.01.016.

摘要

针对电容式电压互感器（capacitor voltage transformer

CVT）谐波测量数据准确度无法满足电能质量监测系统要求的问题

文中提出了一种具有谐波测量功能的CVT的实现方案

通过在常规CVT的分压器低压端串入电容C

利用电容分压原理获得电网谐波测量信号。建立了该CVT的宽频等效电路模型

分析电容C

两端输出电压在谐波频段内的变化情况

明确了影响其频率特性的关键参数。并基于此方案研制了1台110 kV具有谐波测量功能的CVT样机

通过了型式试验并开展了谐波准确度试验

试验结果表明

在2～50次谐波信号测量范围内

该样机满足电能质量监测设备谐波要求

进一步验证了所提方案的有效性。

Abstract

In view of such issue that the accuracy of harmonic measurement data for capacitive voltage transformer（capacitor voltage transformer

CVT）has no way to meet the requirement of power quality monitoring system

a kind of implementation scheme of CVT with harmonic measurement function is proposed in this paper. The harmonic measurement signal of power grid is obtained by way of connecting capacitor C3 in series at the low voltage end of voltage divider of conventional CVT and by the use of voltage division principle. The broadband equivalent circuit model of the CVT is set up so to analyze the variation of output voltage on both sides of capacitor C3 in the harmonic frequency band and the key parameters affecting its frequency characteristic is defined. On the base of this proposal

1 sets of 110 kV CVT prototype with harmonic measurement is developed. The type test is passed and the harmonic accuracy test is performed. It is shown by the test result that the prototype in the range of 2 th to 50 th order harmonic signal measurement meets the harmonic requirements of power quality monitoring equipment and the effectiveness of the proposed scheme is verified further.

关键词

电容式电压互感器（CVT）谐波准确度试验验证频率特性

Keywords

capacitor voltage transformer（CVT）harmonic accuracytest verificationfrequency characteristic

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