配电网线路绝缘状态在线监测研究的论文.pdfVIP

2013 年全国电气工程博士后学术论坛论文集 配电网线路绝缘状态在线监测研究 梁 睿 赵国栋 王崇林 （中国矿业大学信息与电气工程学院，江苏徐州，221116 ） 摘要 本文详细分析了目前配电网线路绝缘状态监测现状，并针对线路绝缘参数测量误差大、 测量信号微弱且易被外界电磁干扰的问题，提出了一种通过记录现场单相接地故障数据或者人为 单相接地实验来测量电缆绝缘参数的方法。该方法无需增加注入信号设备，被测量变化明显，采 用基于调制技术的基频信号提取方法，结合过渡带很窄的切比雪夫低通滤波器，有效的抑制了故 障信号中的非周期分量和谐波分量，不需要对噪声参数在线估计，能够精确计算出每条馈线的对 地参数。人工实验表明，故障接地电阻、故障相初始相位角以及故障距离对测量结果影响小，能 在各种接地方式下实现配电网馈线的绝缘状态在线监视。 关键词：单相接地实验 绝缘参数 调制信号 零序电压 零序电流 Distribution network online monitoring study of line insulation LIANG Rui ZHAO Guodong WANG Chong-lin (School of Information and Electrical Engineering, China University of Mining Technology, Xuzhou, 221116) Abstract This paper analyzes the status of line insulation condition monitoring about domestic and international’s power distribution network in detail, aiming at the problem that cable insulation parameters measurement error relatively large ,weakness of the measured signal and vulnerable to external electromagnetic interference, a method of recording the scene data of single-phase earth fault or performing experiments of single phase to-ground artificially to measure the cable insulation’s parameters is proposed, which not only don’t need to increase the injected signal devices, but also the measured parameters change significantly. Adopting the extraction method of fundamental frequency signal based on modulation technology, combining with a Chebyshev Low-Pass Filter whose transition region is very narrow, suppressing the aperiodic component and harmonic components of the fault signal effectively, not necessarily to estimate the noise parameters. Therefore, it is able to calculate the every feeder’s to-gro