地方电网并网点保护配合问题分析及对策

Problem analysis and countermeasure of power system protection coordination in parallel operation for different power grid

以郴州地区电网为例,针对多级串供、一个变电站存在多回110kV出线、两回联络线T接3种典型结构和运行方式下电网继电保护中的不配合问题进行了分析,易造成上级电网不能躲过下级变电站主变中、低压侧母线故障,导致越级跳闸。并提出了相应的应对策略,为继电保护的正确配合提供依据。

This paper takes Chenzhou area power system as an example, and analyzes the problem of bad coordination of protection in three modes including multi-level supply, a substation with several 110 kV outgoing lines, T-type connection network structure between two tie lines. Superior power grid can not avoid the low voltage side bus fault causing override trip. To solve the above problems, this paper puts forward the corresponding countermeasures, which provides the basis for the correct coordination of relay protection.