计及负荷电流的主变低压侧短路故障分析方法  

Analytical Methods with load current to transformer low voltage side short circuit

作　　者：朱晓红 何彪 Zhuxiaohong;Hebiao(Yunnan Power Grid Co.,Ltd.Qujing Power Supply Bureau,Qujing,65500)

机构地区：[1]云南电网有限责任公司曲靖供电局,云南曲靖655000

出　　处：《云南电力技术》2018年第3期110-113,共4页Yunnan Electric Power

摘　　要：电力系统发生故障时,依据故障录波图对故障进行定量、定性分析,是忽略负荷电流来进行分析的。然而,在一些故障情况下,特别是主变低压侧故障,负荷电流在故障电流中占一定比重,忽略负荷电流进行理论分析会导致错误的结果。本文提出一种计及负荷的三绕组变压器低压侧故障的等效模型,给出消除负荷电流的计算方法,并结合实例,验证该方法的有效性。此方法对故障录波分析具有指导意义和参考价值。Based on fault recorder chart, the fault analysis is usually ignoring the load current in power system. However, in some fault conditions, especially the transformer low voltage side fault, the load current occupies a certain proportion in fault current. Ignoring the load current in analysis will lead to erroneous results. This paper proposed an equivalent model with load current of three winding transformer low voltage side fault, and gave the calculation method to eliminate load current, and verified the validity of this method by an example.

关 键 词：故障录波图 负荷电流 三绕组主变 等效模型 

分 类 号：TM74[电气工程—电力系统及自动化]