多回线跨电压不接地故障时的短路电流计算方法研究  

Research on calculation method of short-circuit current for multi-circuit line cross-voltage ungrounded fault

作　　者：王哲强 Wang Zheqiang(Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Foshan 528000,China)

机构地区：[1]广东电网有限责任公司佛山供电局,广东佛山528000

出　　处：《现代科学仪器》2019年第5期113-115,共3页Modern Scientific Instruments

摘　　要：由于传统的短路电流计算方法,在进行短路电流计算时容易产生谐波造成电压失衡,因此计算误差值大,无法实现对多回线跨电压不接地故障时的短路电流精准计算。针对这一问题,提出多回线跨电压不接地故障时的短路电流计算方法。首先,确定多回线跨电压不接地故障边界条件,再通过建立短路电流端口阻抗矩阵,计算不接地故障时的短路电流。最后通过实验证明多回线跨电压不接地故障时的短路电流计算方法可以减少短路电流的计算误差值,实现对短路电流的高精准计算。Due to the traditional short-circuit current calculation method,it is easy to generate harmonics and cause voltage imbalance in the short-circuit current calculation.Therefore,the calculation error value is large,and the shortcircuit current cannot be accurately calculated when the multi-circuit line voltage is not grounded.Aiming at this problem,a short-circuit current calculation method for multi-circuit line cross-voltage ungrounded fault is proposed.First,determine the boundary conditions of the multi-circuit line voltage-to-ground fault,and then establish the short-circuit current port impedance matrix to calculate the short-circuit current during the ground-fault.Finally,it is proved through experiments that the short-circuit current calculation method for multi-circuit line cross-voltage ungrounded faults can reduce the calculation error value of the short-circuit current and achieve highly accurate calculation of the short-circuit current.

关 键 词：多回线 跨电压不接地故障 短路电流 计算方法 

分 类 号：TM713[电气工程—电力系统及自动化]