摘要
部分站用变配电线路中常出现越级跳闸的问题,造成停电范围扩大,严重威胁供电可靠性,本文首先分析了造成继电保护越级跳闸原因,包括支路保护整定设置不当、上下级保护配合不合理、断路器等元器件故障等,进而对继电保护整定原则和级间配合进行了改进分析,并设计了零序电流保护与脱扣器结合的继电保护方案,现场实验结果表明,该方案可有效解决越级跳闸问题,避免了停电范围扩大及其带来的繁重检修任务,提高供电可靠性。
Over-level tripping often occurs in some substations of electric distribution grid,which may cause and expand power outages and seriously threaten the reliability of power supply.This paper ana-lyzes the causes of the relay protection tripping,including improper setting of branch protection;unreasonable protection coordination between upper and lower levels;failure of components such as circuit breakers etc.Then,a novel relay protection scheme combining zero-sequence current protection and trip unit is designed to improve the setting arrangement and inter-stage cooperation of the relay protection.Field test results show that the scheme proposed by this paper can effectively solve the problem of over-level tripping,and avoid the expansion of power outage and the heavy maintenance tasks brought by it.It can effectively improve the reliability of power supply.
出处
《输配电工程与技术》
2019年第2期53-61,共9页
Transmission and Distribution Engineering and Technology
基金
国网湖北省电力公司检修公司科技项目(SGHBJX00EDJS1800560)。
