一种故障分量选相元件接地短路判据的修正  

A correction of ground short-circuit criterion of phase selection element based on faulty components

作　　者：程志友[1,2] 李小静 汤明金 夏霜 CHENG Zhiyou;LI Xiaojing;TANG Mingjin;XIA Shuang(Power Quality Engineering Research Center,Ministry of Education,Hefei 230601,China;School of Electronics and Information Engineering,Anhui University,Hefei 230601,China)

机构地区：[1]教育部电能质量工程研究中心,安徽合肥230601 [2]安徽大学电子信息工程学院,安徽合肥230601

出　　处：《电力系统保护与控制》2018年第16期19-24,共6页Power System Protection and Control

基　　金：国家自然科学基金资助项目(6172032);安徽省科技攻关项目(1604a0702016)~~

摘　　要：在详细分析故障分量选相原理的基础上,对传统故障分量选相元件的接地短路故障判据进行了修正。修正后的判据仅利用负序故障分量电流相位和正序故障分量电流相位之间的相位差,加入对零序电压分量的阈值判断来区分接地故障。克服了原判据由于零序电流分布因子与正、负序电流分布因子不相等而产生误判的缺点,较好地解决了接地故障误判断问题,同时简化了选相流程。仿真实验验证了该判据的正确性和稳定性。Based on the detailed analysis of fault component phase selection principle,the traditional ground short-circuit criterion of phase selection element based on faulty components is improved.The improved criterion only uses the phase difference between the negative sequence faulty components current phase and the positive sequence faulty components current phase and adds the threshold judgment of the zero sequence voltage component to distinguish the ground fault.It avoids the shortcomings of misjudgment since the zero sequence current distribution factor is not equal to its positive and negative ones in the traditional ground short-circuit criteria as well as simplifies the phase selection process.Simulation results show that the improved criterion is valid and stable.

关 键 词：故障分量 选相元件 接地短路 电流相位 分布因子 

分 类 号：TM77[电气工程—电力系统及自动化]