750kV同塔双回线接地距离保护整定计算  

Setting Calculation of Ground Distance Protection for 750 kV Double Circuit Lines on the Same Tower

作　　者：张健康[1] 粟小华[1] 胡勇[1] 

机构地区：[1]西北电力调度通信中心,陕西省西安市710048

出　　处：《电力系统自动化》2009年第22期102-105,共4页Automation of Electric Power Systems

摘　　要：分析了同塔双回线运行方式与零序补偿系数的关系,指出目前整定计算中采用固定零序补偿系数难以兼顾接地距离保护在750kV同塔双回线正常运行方式下具有较高的灵敏性,同时在单回线挂检方式下又具有较好的选择性。提出在750kV同塔双回线整定计算中采用微机保护定值区切换功能,根据运行方式选择相应的零序补偿系数,从而消除运行方式对测量阻抗的影响,提高接地距离保护动作性能。以中国第1条750kV同塔双回线为例,采用ATP仿真软件验证了该方案的有效性。The relationship between the operation mode of double circuit lines on the same tower （DLST） and the zero sequence current compensation coefficient （ZSCC） is analyzed. It＇s evident that the fixed ZSCC adopted in the conventional setting method is unable to guarantee ground distance protection obtain higher sensitivity under double lines normal operation mode and better selectivity under single line operation mode. To improve the performance of ground distance protection, setting value section switching function of microcomputer protection is proposed in setting calculation, which selects the suitable ZSCC according to operation mode to eliminate the effect of operation mode on the measured impedance. Finally, the validity of this scheme has been verified by ATP simulation software, with the model of an actual 750 kV DLST in northwest grid of China.

关 键 词：同塔双回线 接地距离保护 整定计算 

分 类 号：TM773[电气工程—电力系统及自动化]