典型因素耦合影响下电容式电压互感器频率特性分析与仿真研究  

Analysis and Simulation of Frequency Characteristics of Capacitor Voltage Transformer Under the Influence of Typical Factor Coupling

作　　者：李宾宾 罗沙 黄杰 马亚彬 朱胜龙 张孟鹃 LI Binbin;LUO Sha;HUANG Jie;MA Yabin;ZHU Shenglong;ZHANG Mengjuan(Electric Power Research Institute of State Grid Anhui Electric Power Co.,Ltd.,Hefei 230601,China;State Grid Anhui Electric Power Co.,Ltd.,Hefei 230022,China;Hefei University of Technology,Hefei 230009,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院,安徽合肥230601 [2]国网安徽省电力有限公司,安徽合肥230022 [3]合肥工业大学,安徽合肥230009

出　　处：《电工技术》2023年第7期60-63,共4页Electric Engineering

摘　　要：电容式电压互感器含有多个动态元件,电网频率的随机变化会破坏其额定频率下的阻抗匹配关系,影响一次高压信号的准确测量。通过建立典型因素耦合影响下电容式电压互感器的等值电路模型,对工程中常用的电容式电压互感器误差计算公式进行修正,以提升电网频率影响下电容式电压互感器的分析精度。基于110 kV电容式电压互感器的实际运行参数建立了仿真模型,结果表明电网频率变化在(50±0.5)Hz时,电容式电压互感器的附加误差较大,超出标准规定的误差限值要求。The capacitor voltage transformer contains many dynamic components.The random change of the grid frequency will destroy the impedance matching relationship at the rated frequency and affect the accurate measurement of the primary high-voltage signal.In this paper,the equivalent circuit model of capacitor voltage transformer under the influence of typical factor coupling is established,then the error calculation formula of capacitor voltage transformer commonly used in engineering is modified to improve the analysis accuracy of capacitor voltage transformer under the influence of grid frequency.Based on the actual operating parameters of 110 kV capacitor voltage transformer,a simulation model is established.The results show that when the frequency of the power grid changes at(50±0.5)Hz,the additional error of the capacitive voltage transformer is large,which exceeds the error limit specified by the standard.

关 键 词：电容式电压互感器 频率特性 耦合影响 附加误差 

分 类 号：TM732[电气工程—电力系统及自动化]