摘要
站用交流电源各级馈线保护电器灵敏度是否满足要求关系到在发生接地或短路故障时,是否能够可靠、快速切断故障回路。阐述了变电站低压交流电源断路器的配置原则,研究了计及系统阻抗、变压器阻抗和各级电缆阻抗的各级保护电器短路电流计算方法,在此基础上开发了站用交流电源保护电器灵敏度校核软件,研制了一套基于小电流预估和短路模拟法的站用交流保护电器灵敏度现场校验装置,介绍了软件测试流程、装置系统原理与测试方法,以河北省南部电网某500 kV变电站为例,对各级交流馈线保护电器进行了灵敏度校核算例分析和现场试验验证,分析存在的问题并提出了详细的整改措施。
Whether the sensitivity of all levels of feeder protection appliances at all levels of the station AC power supply meets the requirements is related to whether the fault circuit can be reliably and quickly cut off in case of grounding or short circuit fault.This paper expounds the configuration principle of low-voltage AC power circuit breaker,studies the short-circuit current calculation method of meter and system,based on small current estimation and short circuit simulation A 500 kV substation of Hebei North-South Grid,as an example,conducted sensitivity calibration case analysis and field test verification of AC feeder protection appliances at all levels,analyzed the existing problems and put forward detailed rectification measures.
作者
李秉宇
杜旭浩
郭小凡
LI Bingyu;DU Xuhao;GUO Xiaofan(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China)
出处
《河北电力技术》
2022年第3期58-62,共5页
Hebei Electric Power
基金
国网河北省电力有限公司科技项目(kj2020069)。
关键词
变电站
交流电源
短路电流
灵敏度校核
保护电器
substation
AC power supply
short circuit current
sensitivity check
protection of electrical appliances
