两起配电变压器短路故障分析
Analysis of Two Short Circuit Faults in Distribution Transformers
闫石 1钟素梅2
作者信息
- 1. 深圳市机场(集团)有限公司,广东 深圳 518128
- 2. 深圳地铁运营集团有限公司,广东 深圳 518040
- 折叠
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.
Abstract
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.
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Key words
distribution transformer/low resistance grounding power system/turn-to-turn short circuit/single-phase grounding short circuit/relay protection引用本文复制引用
出版年
2024
NETL
NSTL
万方数据