Analysis and Verification Study on Influence of Electrical Field on CVT’s Error

WANG Huan; ZHOU Feng; FENG Ling; XIANG Qiong; YAO Teng

doi:10.14044/j.1674-1757.pcrpc.2021.01.015

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Analysis and Verification Study on Influence of Electrical Field on CVT’s Error

更新时间：2024-09-14

- Analysis and Verification Study on Influence of Electrical Field on CVT’s Error
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 42, Issue 1, Pages: 88-94(2021)
- 作者机构：
  
  1. 中国电力科学研究院有限公司
  2. 华中科技大学
  3. 国网重庆市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.2021.01.015
  CLC： TM451
- Published：2021，
- 稿件说明：
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[1]王欢,周峰,冯凌,项琼,姚腾.电场对电容式电压互感器误差影响机理分析及验证研究[J].电力电容器与无功补偿,2021,42(01):88-94.

WANG HUAN, ZHOU FENG, FENG LING, et al. Analysis and Verification Study on Influence of Electrical Field on CVT’s Error. [J]. Power capacitor & reactive power compensation, 2021, 42(1): 88-94.
[1]王欢,周峰,冯凌,项琼,姚腾.电场对电容式电压互感器误差影响机理分析及验证研究[J].电力电容器与无功补偿,2021,42(01):88-94. DOI： 10.14044/j.1674-1757.pcrpc.2021.01.015.

WANG HUAN, ZHOU FENG, FENG LING, et al. Analysis and Verification Study on Influence of Electrical Field on CVT’s Error. [J]. Power capacitor & reactive power compensation, 2021, 42(1): 88-94. DOI： 10.14044/j.1674-1757.pcrpc.2021.01.015.

摘要

敞开式的结构设计导致电容式电压互感器（capacitor voltage transformer

CVT）运行时受周围设备产生的电场影响

以及外界产生的杂散电容参与电容单元分压比计算

导致中间电压值与设计值产生偏差

离线误差校准数据不能直接反映实际工作误差情况。为定量分析周围电场对CVT误差产生影响程度

以500 kV电压等级CVT实际参数建立有限元电场分析平台

开展金属支架、避雷器、高压引线产生的电场对CVT误差影响程度仿真分析计算

结合仿真试验对仿真结果进行验证分析。通过分析比较仿真数据与实测数据可知

外电场仅对CVT的比值差产生影响

周围设备导致的电场增加时会导致CVT比值差增加

高压引线夹角、长度、直径改变后对CVT比值差的影响在0.05%以内。该结论对开展CVT离线误差试验数据分析提供技术支撑。

Abstract

The capacitive voltage transformer（CVT）in operation is affected by the electrical filed of generated by the surrounding equipment due to its open type structure design. The participation of externally generated stray capacitance in the voltage division ratio of the capacitor unit leads to the deviation between the intermediate voltage and the design voltage and the offline error calibration data cannot directly reflect the actual operation error. In order to quantitatively analyze the influence extent of the surrounding electric field on the error of CVT

a finite element electric field analysis platform is established with the actual parameter of 500 k V CVT so to develop the simulation and analysis calculation on the influence extent of electrical field generated by the metal bracket

lightning arrester and high voltage lead on the error of CVT.Then

the simulation result is verified and analyzed in combination of real type test. Finally

it is known by analyzing and comparing the simulation data and actually measured data that external electrical field only affects the ratio difference of CVT and the electrical filed increase due to the surrounding equipment will lead to the increase of ratio difference of the CVT. The influence of variation of high voltage lead in the included angle

length and diameter on the ratio difference of the CVT is within 0.05%. This conclusion provides technical support for the analysis of CVT offline error test data.

关键词

电容式电压互感器（CVT）电容分压器中间电压误差机理验证试验

Keywords

capacitor voltage transformer（CVT）capacitor voltage dividerintermediate voltageerror mechanismverification test

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