两起配电变压器短路故障分析  

Analysis of Two Short Circuit Faults in Distribution Transformers

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)

机构地区：[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

出　　处：《现代建筑电气》2024年第7期29-34,共6页Modern Architecture Electric

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.

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 

分 类 号：TU852[建筑科学]