电力系统变压器故障态电压电流相量分析  

Voltage and Current Phasor Analysis of Transformer Fault State in Power System

作　　者：郑浩聪 ZHENG Haocong(Chaozhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Chaozhou 521000,China)

机构地区：[1]广东电网有限责任公司潮州供电局,广东潮州521000

出　　处：《通信电源技术》2021年第16期59-61,共3页Telecom Power Technology

摘　　要：电力系统变电站中常见的YNd11接线变压器在不同故障类型下高低压侧电流、电压相量关系会发生相位变化,在故障发生时无法快速准确地判断故障类型。利用序分量的独立性推导了Y-Δ转换公式,并结合不同故障情况的边界条件对变压器高低绕组不同故障状态下的非故障侧电压、电流相量关系进行了计算分析,并给出了具体结论,以此为快速判断主变故障类型提供理论支撑。The common YNd11 wiring transformer in power system substations will change the phase of the current and voltage phasor relationship on the high and low voltage sides under different fault types,and it is impossible to quickly and accurately determine the fault type when a fault occurs.Using the independence of sequence components,the Y-Δ conversion formula is derived,and combined with the boundary conditions of different fault situations,the phasor relationship between the voltage and current on the non-fault side of the transformer's high and low windings under different fault states is calculated and analyzed,and specific details are given.In conclusion,this provides theoretical support for quickly determining the fault type of the main transformer.

关 键 词：变压器 短路故障 电压电流相量 Y-Δ转换 

分 类 号：TM4[电气工程—电器]