大型发电机组支接于高压线路的系统继电保护

SYSTEM RELAY PROTECTION FOR HIGH VOLTAGE LINE WITH BRANCH OF LARGE-SIZE GENERATOR-TRANSFORMER UNIT

简要介绍了支接线路情况 ;详细分析了支接线路距离保护、零序保护和三侧高频保护的特点及相应采取的技术措施 ,以及三侧电源支接线路内部考虑助增因素条件下距离保护的整定方法和计算结果 ;介绍了如何解决分支线路高频信号介入衰耗和差拍、大型发电机组支接于高压线路的继电保护运行方式等问题 ;简要介绍了三侧高频保护的运行效果和动作行为分析。

This paper briefly introduces the branch line and analyzes the characteristics and technical requirements of distance protection, zero sequence protection, protection by PLC channel for 3 branch line etc installed in the branch line. The setting methods and calculation results of the distance protection for the branch line with 3 sides power supply sources are given when considering branch coefficient in the internal line. The problems of attenuation and disagreement of high frequency protection signal for the branch line and the operation mode of relay protection for high voltage line with branch of large size generator transformer unit etc are discussed. The operation and analysis of the protection by PLC channel for 3 branch line are simply introduced.