基于三相电流平方和比值的短路故障快速检测方法  

A fast short-circuit fault detection method based on the ratio of three-phase currents square sum

作　　者：李奕璋[1] 陈红坤[1] 石晶 陈磊[1] 胡卓然 吴行健 LI Yizhang;CHEN Hongkun;SHI Jing;CHEN Lei;HU Zuoran;WU Xingjian(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《电力系统保护与控制》2020年第24期111-119,共9页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2018YFB0904300)。

摘　　要：为了快速准确地检测出短路故障,并使故障限流器快速投入运行,提出了一种基于三相电流平方和比值的短路故障快速检测方法。该方法利用前后时间窗内三相电流平方和均值之比作为故障检测量,在三相短路故障时不受故障初相角影响,不受谐波影响。基于PSCAD/EMTDC仿真平台,建立了500 kV输电线路模型,合理选取了该方法的整定值与闭锁值。考虑不同故障类型、不同故障初相角、不同过渡电阻、空载合闸、谐波及噪声等因素,验证了该方法的快速性及有效性。在各类故障工况及干扰工况下,比较了该方法与常用三种检测方法的性能差异。仿真结果表明,该方法性能良好,能够快速可靠地检测出短路故障。In order to detect short-circuit faults quickly and accurately,and put the fault current limiter into operation quickly,a fast short-circuit fault detection method based on the ratio of three-phase currents square sum is proposed.This method detects fault by the ratio of three-phase currents square sum.It is not affected by the initial fault phase angle under a three-phase short-circuit fault and harmonics.A 500 kV transmission line model is established on the PSCAD/EMTDC simulation platform.Reasonable setting values and blocking values of this method are selected.The speed and effectiveness of this method are verified under different fault types,different fault initial phase angles,different transition resistances,no-load closing,harmonics and noise.The performance difference is compared between this method and three commonly-used methods under fault and interference conditions.The simulation results show that this method has good performance and can detect short-circuit faults quickly and reliably.

关 键 词：故障检测 短路故障 短路电流 三相电流平方和 故障初相角 

分 类 号：TM713[电气工程—电力系统及自动化]