摘要
针对某35 kV小电阻接地供电系统发生的两起35 kV干式配电变压器短路故障进行分析,提出改进措施。阅读故障录波并结合故障变压器现场检查、试验,采用对称分量法及双端口网络理论对故障过程、保护动作进行分析,通过电磁暂态仿真软件(PSCAD/EMTDC)的仿真与故障变压器的解体检查得以验证。提出优化继电保护配置与整定,开展配电变压器状态检测等改进措施。
According to two short circuit faults of 35 kV dry type distribution transformers in a 35 kV power system by low resistance grounding,analysis cause and improvement are proposed.Combined with fault recording,inspection and test,fault processes and protection operations are analyzed by symmetrical component method,two-port network method and simulated,verified by PSCAD/EMTDC and disassembling inspection.Improvement of configuration and setting of protective relaying and status detections are proposed.
作者
闫石
钟素梅
YAN Shi;ZHONG Sumei(Shenzhen Airport(Group)Co.,Ltd.,Shenzhen 518128,China;Shenzhen Metro Operation Group Co.,Ltd.,Shenzhen 518040,China)
出处
《现代建筑电气》
2024年第7期29-34,共6页
Modern Architecture Electric
关键词
配电变压器
小电阻接地系统
匝间短路
单相接地短路
继电保护
distribution transformer
low resistance grounding power system
turn-to-turn short circuit
single-phase grounding short circuit
relay protection
