高电压技术2012，Vol.38Issue(3)：544-552,9.
采用LED光纤传感器的绝缘子串泄漏电流测量方法
Measurement Method for Leakage Current of Insulator String Applying LED Optical Fiber Sensor
摘要
Abstract
Measuring the leakage current of insulator strings is currently one of the principal means to monitor the contamination level of transmission lines insulator surface;however,due to the complex environment of transmission lines,a large amount of electromagnetic interference will produce much noise at the time of collecting leakage current.Therefore,in order to improve the anti-jamming and accuracy when sensors were used to measure insulator leakage current,an optical fiber sensor was employed to measure leakage current of the insulator strings,in which light emitting diode（LED） was used to detect the current signal as the photoelectric conversion and light signal stability.Taking three-piece XP-160 insulator strings as examples when ρESDD was 0.05～0.2 mg/cm2 and humidity was 85%,we increased the voltage gradually to obtain the leakage current.Results reveal that the optical fiber sensor can achieve selective measurement of leakage current,the positive half cycle or negative half cycle,and the full cycle current can be monitored after differential circuit is improved.Its zero-extinct period is less than 1 ms and response time is limited in 0.1 ms,and its sensitivity reaches 40 V/A.The pertinence coefficients of linear fitting are all higher than 99.94%,and its frequency response is 1～10 kHz,which can meet the basic requirements of the leakage current measurement.关键词
绝缘子串/泄漏电流/光纤传感器/发光二极管（LED）/正、负半周波/差分运算Key words
insulator strings/leakage current/optical fiber sensor/light emitting diode(LED)/half or full cycle current/difference algebra分类
信息技术与安全科学引用本文复制引用
姚陈果,王建,冉启华,李成祥,米彦..采用LED光纤传感器的绝缘子串泄漏电流测量方法[J].高电压技术,2012,38(3):544-552,9.基金项目
国家重点基础研究发展计划（973计划） （）
中央高校基本科研业务资助基金 （）
输配电装备及系统安全与新技术国家重点实验室自主研究项目 （）
