电子式电压互感器暂态响应的影响因素分析

电气工程学报 ›› 2015, Vol. 10 ›› Issue (10): 37-43.

电子式电压互感器暂态响应的影响因素分析

刘琦¹,徐雁¹,高飞²,程昱舒²,赵园²,肖霞¹

^1. 华中科技大学光电互感器研发中心武汉 430074
^2. 国网山西省电力公司计量中心太原 030001

收稿日期:2015-08-26 出版日期:2015-10-25 发布日期:2020-01-03
作者简介:刘琦, 男 1991年生,硕士研究生,主要从事电子式互感器的研究。|徐雁, 女 1963年生,博士,硕士生导师,主要从事电力系统电磁测量方面的科研及教学工作。

Simulation Research on Electronic Voltage Transformer Transient Process

Liu Qi¹,Xu Yan¹,Gao Fei²,Cheng Yushu²,Zhao Yuan²,Xiao Xia¹

^1. Optic-Electrical Transformer Research and Development Center Huazhong University of Science and Technology Wuhan 430074 China
^2. Shanxi Electric Power Company State Grid Metering Center Taiyuan 030001 China

Received:2015-08-26 Online:2015-10-25 Published:2020-01-03

摘要/Abstract

摘要：

电子式电压互感器的暂态特性直接决定其在投入电网后能否稳定运行,基于电容分压的电子式电压互感（ECVT）暂态过程主要与电容分压器及负载相关。从理论上分析了电容分压器二次负载电阻及电容器内阻对ECVT暂态特性的影响;对220kV ECVT进行建模,仿真分析了二次负载电阻和电容器串联内阻对短路及重合闸暂态过程的影响,对不同的系统重合闸动作时限给出了相应的二次负载电阻值的最佳取值范围,找出了电容器串联内阻对暂态特性影响的规律。仿真结果表明,对所研制的ECVT,二次负载电阻取300?500kΩ为最佳,高、低压侧电容器串联内阻之比是分压比为最佳。本文的实验结果显示,合理选择电容器和二次负载电阻可以改善暂态特性。

关键词: 电子式电压互感器, 短路, 重合闸, 暂态过程, 电容分压器

Abstract:

When an electronic voltage transformer is put into the power system,whether it works stably depends on its transient behavior,the transient process of the electronic voltage transformerbased on capacitive（ECVT） voltage is mainly related to capacitive voltage divider and the part connected to it. The influence of the capacitive voltage divider’s load resistance and internal resistance for ECVT is analysed in theory. A simulation model is built for a 220kV ECVT to simulate the influence of the capacitive voltage divider’s load resistance and internal resistance in short-circuit and reclosing transient, and the best range of load resistance for different reclosing time is given, the law of capacitor internal resistance’s impact on transient characteristics is found out.Simulation results show that for the researched ECVT ,the load resistance takes 300~500kΩ as the best,the high-low capacitor series resistance ratio is best to be equal to the voltage ratio.This paper’s experimental data shows that selecting capacitor and load resistance reasonably can improve the transient characteristics.

Key words: Electronic voltage transformer, short-circuit, reclosing, transient process, capacitor voltage divider

中图分类号:

TM451+.2

刘琦,徐雁,高飞,程昱舒,赵园,肖霞. 电子式电压互感器暂态响应的影响因素分析[J]. 电气工程学报, 2015, 10(10): 37-43.

Liu Qi,Xu Yan,Gao Fei,Cheng Yushu,Zhao Yuan,Xiao Xia. Simulation Research on Electronic Voltage Transformer Transient Process[J]. Journal of Electrical Engineering, 2015, 10(10): 37-43.

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内阻比λ	U2 /V	内阻比λ	U2 /V
0.01K	-95.296U2m	0.5K	-U2m
0.1K	-8.97U2m	0.8K	-0.25U2m
0.2K	-3.99U2m	1K	0
0.3K	-2.32U2m	2K	0