精确测距在超高压输电线路保护中应用研究.pdfVIP

第 35 卷 增刊 继电器 Vol.35 Suppl. 2007 年 12 月 1 日 RELAY Dec. 1, 2007 精确测距在超高压输电线路保护中应用研究 樊占峰，杨恢宏，廉海涛，王莉，胡叶宾 （许继电气公司技术中心，河南 许昌 461000） 摘要：基于目前超高压输电线路保护装置中的故障测距方法精度不高的现状，结合 500 kV 超高压输电线路模型特点，研究 高精度测距在超高压线路保护中应用的方法；首先简要分析阻抗法测距、故障分析法测距等方法的特点，并通过详细研究制 约保护装置中测距精度的各方面因素，对制约因素逐一研究解决，提出一套高压线路保护中可应用的全面测距方案；分别为 采用电流相位补偿技术解决保护装置在弱故障时的电流相位精度，通过采用分布参数法解决高压模型带来的误差，设计适用 高压输电线路的精确、快速级联式数字滤波器解决信息量的可靠提取；本文对以上的方法进行详细的分析论证，并通过在 500 kV 超高压输电线路的 RTDS 实时数据仿真系统数学模型进行验证测试，测距精度相对误差2% 。 关键词: 故障测距； 相位补偿； 分布参数； 数字滤波器 Research on precise fault location of ultra-high voltagetransmission line protection device FAN Zhan-feng ，YANG Hui-hong ，LIAN Hai-tao ，WANG Li ，HU Ye-bin （Technology center in Xuji electric corporation,Xu’chang 461000, China ） Abstract: Fault location method for ultra-high voltage transmission line protection device is in low precision presently. By considering characterestic of 500 kV ultra-high voltage transmission line model, high accurate fault location method for ultra-high voltage line protection device is researched; Firstly, characterestic of impedance method fault locator and fault analytical method fault locator is analyzed briefly, moreover every factor that restricting fault location precision in protection device is researched particularly to resolve, then the paper present a general fault location scheme that applicable for high voltage line protection; In the scheme, current phase compensation technique is used to resolve current phase precision of protection device when light fault occurs, algorithm based on distributed parameter is used to resolve the error brought by ultra-high volta