220 kV周潮线接地距离保护整定计算特殊方案

在220kV输电线路保护方案中,普遍配置三段式接地距离保护.随着电网的发展,其结构也日益复杂,下一级变电站主变运行方式的不同,可能造成接地距离保护区过大或灵敏度不够,上、下级保护之间配合困难.以承德220kV周潮线和潮河220kV变电站为例,对220kV周潮线接地距离保护整定计算中存在的问题进行分析,主要对整定配合原则...

Special setting calculation program of 220 kV Zhou-chao transmission line ground distance protection

The three-stage ground distance protection is generally configured in 220 kV transmission line protection program.With the development of power grids,the structure is increasingly complex.The main transformer of the next substation under different operation mode may cause the distance protection scope too large or the protection low sensitivity,and the difficult cooperation between the higher and the lower-level protection.By taking Chengde 220 kV Zhou-chao transmission line and 220 kV substation of Chaohe as an example,some existing problems in setting calculation were analyzed and discussed in this paper.The cooperation principle of setting was adjusted and the program that the 145 bus-tie breaker in the middle voltage side of the main transformer delayed 0.3 s for tripping to split operation was put forward.The system short-circuit impedance was increased to make the coordination between upper protection and lower protection more reasonable,and the line operation reliability was improved.