电力系统保护与控制2011，Vol.39Issue(24)：28-34,7.
跨电压等级同杆四回线接地距离保护的研究
Ground distance protection for four joint transmission lines with different voltage grades on the same tower
摘要
Abstract
The impact of mutual inductor on setting computation and operation characteristic of ground distance protection are analyzed in detail. A zero-sequence current compensation coefficient of ground-fault distance protection for four-parallel line on the same tower is discussed especially and algorithm of relay settings is presented for correct operation of ground distance protection. Algorithm of zero-sequence current compensation coefficient and compensate voltage for four-parallel line of different voltage grades is proposed. And simulation research is done for ground distance protection with compensation coefficient. Research shows that this protection scheme almost cannot reflect transition resistance. In order to increase the ability of anti-transition resistance, the multiphase-compensated ground distance protection is proposed to be used in four transmission lines. The zero sequence reactance relay and its ability of anti-transition resistance are analyzed in detail. Analysis shows that transition resistance has little effect on zero sequence reactance relay. The multiphase-compensated ground distance protection can be used in the ground protection of four-parallel line of different voltage grades.This work is supported by National Natural Science Foundation of China (No. 50807037).关键词
四回线/零序补偿系数/接地距离保护/过渡电阻/零序电抗继电器Key words
four-parallel line/ zero-sequence current compensation coefficient/ ground distance protection/ transition resistance/ zero-sequence reactance relay分类
信息技术与安全科学引用本文复制引用
马晓明,范春菊,刘玲..跨电压等级同杆四回线接地距离保护的研究[J].电力系统保护与控制,2011,39(24):28-34,7.基金项目
国家自然科学基金项目(50807037) （50807037）
