摘要
针对电网某35 k V变电所变压器发生的一起A相高压绕组短路故障造成35 k V变压器差动保护动作跳闸的现象,以变电所设备参数和保护装置的故障录波为参考,进行了短路电流理论分析,推导出短路电流计算公式并进行短路电流反演计算。理论分析和短路电流计算结果与故障录波图提供的信息相一致,从而证实了35 k V变压器差动保护的动作行为是正确的。
The fault at the phase A of a 35 k V transformer high voltage winding activated its differential protection. This paper theoretically analyses the short circuit current by using the substation equipment parameters and fault recording data.Also, the short circuit current is calculated by using the derived short circuit current computing formula. It turns out that the theoretical and computational results of the short circuit current are consistent with each other, which confirms the 35 k V transformer differential protection＇s correct action.
出处
《江苏电机工程》
2016年第4期80-83,86,共5页
Jiangsu Electrical Engineering
关键词
35kV不接地系统
35KV变压器
单相高压绕组短路
差动保护
动作行为
35 kV neutral-unearthed system
35 kV transformer
single-phase high voltage winding short circuit
differential protection
actions
