变电站容性设备泄漏电流的在线提取与误差分析  

On-line extraction and error analysis designed for leakage current of substation capacitive equipment

作　　者：沈显庆[1] 段小龙[1] 

机构地区：[1]黑龙江科技大学电气与控制工程学院,哈尔滨150022

出　　处：《黑龙江科技大学学报》2015年第6期676-680,共5页Journal of Heilongjiang University of Science And Technology

基　　金：黑龙江省教育厅科学技术研究项目(12541697)

摘　　要：容性设备泄漏电流比较小,在提取电流过程中,因噪声干扰和设备本身的误差难以测量其真实值。通过建立穿心式零磁通传感器模型,利用Matlab仿真分析普通传感器和补偿传感器对测量结果的影响;采用基于加窗的谐波分析法,分析减小频率波动对测量误差的影响。仿真结果表明:该方法可以减小角差、比差及频率波动对在线监测设备的影响,能够有效提高泄漏电流的检测精度和系统的鲁棒性。This paper seeks to address the notorious difficulties arising from the extraction of the real value of leakage current in the capacitive equipment due to the combined occurrence of the smaller leakage current, the noise interference, and the inherent errors in equipment. The study accomplishes this by building the model of zero flux sensor with cored structure; simulating and analyzing the influence of ordinary sensor and compensatory sensor on measurement using Matlab; and reducing the measurement error resulting from frequency fluctuation by applying the harmonic wave analysis approach with window function. The simulation shows that this method can provide a reduced influence of angle difference and ratio error and frequency fluctuation on on-line monitoring equipment,an improved measurement accuracy of leakage current, and a better system robustness.

关 键 词：泄漏电流 频率波动 零磁通传感器 窗函数 MATLAB仿真 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]