高电压技术2013，Vol.39Issue(5)：1149-1155,7.DOI:10.3969/j.issn.1003-6520.2013.05.019
减少Kerr效应法在油纸绝缘结构中直流电场测量误差的方法
Methods to Decrease the Measuring Errors of DC Electric Field Measurement in the Oil-paper Insulation Based on the Kerr Effects
摘要
Abstract
The Kerr electric-optic effects could be useful for measuring electric field in liquid dielectric; however,it is difficult to apply them to accurately measure electric field in oil-paper insulation system.Thus,we established a contact-free on-line electric field measurement platform for measuring electric field in liquid dielectric based on the Kerr electric-optic effects.Based on the platform,factors leading to its measurement errors and measures to reduce these errors were analyzed and discussed.It is concluded that relative errors caused by edge effect of electrode and pressboard can be reduced to 1.3％ by lengthening the electrode and covering it by oil-impregnated paper.Moreover,the actual parameters of the optical components were measured to correct the errors caused by the nonideal characters of the optical components.In order to increase the signal noise ratio of the system,the frequency of AC modulated voltage applied to the testing model was carefully selected based on a statistical analysis of the frequency spectrum of the laser output noise by FFT,and then the relative errors caused by the source noise could be reduced to 0.86％ for DC electric field measurement,and 1.6％ for AC electric field measurement.At last,a sensitivity test of the measurement platform was performed with a plate electrode,indicating that the system was capable of measuring DC fields with accuracy of 20 V/mm and a relative error lower than 5.4 ％.关键词
Kerr效应/测量误差/边缘效应/Kerr系数/信噪比/灵敏度Key words
Kerr effects/ measurement error/ edge effect/ Kerr constant/ SNR/ sensitivity引用本文复制引用
吴昊,齐波,李成榕,赵晓林,魏振,王国利..减少Kerr效应法在油纸绝缘结构中直流电场测量误差的方法[J].高电压技术,2013,39(5):1149-1155,7.基金项目
国家自然科学基金(51107038) （51107038）
特高压工程技术(昆明、广州)国家工程实验室开放基金(NEL201107) （昆明、广州）
中央高校基本科研业务费专项(12ZP06) （12ZP06）
Project supported by National Natural Science Foundation of China (51107038),Opening Fund of National Engineering Laboratory for Ultra High Voltage Engineering Technology (Kunming,Guangzhou) (NEL201107),Fundamental Research Fund for the Central Universities(12ZP06). （51107038）
