同塔四回输电线路的模量电流差动保护  

Mode-current differential protection of quadruple-circuit transmission lines on the same tower

作　　者：张琦兵[1] 邰能灵[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《电力系统保护与控制》2010年第18期33-37,43,共6页Power System Protection and Control

基　　金：上海市曙光计划资助项目(07SG11);教育部新世纪优秀人才计划(NCET-08-0356)

摘　　要：同塔四回输电线中,电容电流对电流差动保护的影响较大,电流差动保护在应用时需经相模变换在模量下对电容电流进行补偿,然后经相模反变换到相量形成保护判据。选取不同的同塔四回线相模变换矩阵,研究经相模变换后各模量对各种故障类型的不同反映特征。在此基础上,提出了适合于同塔四回输电线路的基于模量的新型电流差动保护。此模量电流差动保护方案的电容电流补偿计算简单,并且能实现单相接地的故障选相。利用PSCAD/EMTDC对新保护方案进行了大量的仿真验证,证实了其选相及分相动作能力。The capacitance current has a notable influence on current differential protection in the quadruple-circuit transmission lines on the same tower. The capacitance current compensation for the current differential protection must compute in the mode by the phase-mode transformation for convenient, and then form the protection criterion using mode-phase transformation method. The mode current will reflect different fault types if the transformation matrices are different. Based on this principle, this paper presents a new mode-current differential protection for quadruple-circuit transmission line. The capacitance current compensation of this protection scheme is simple and can realize the fault phase selection of single-phase grounding. The phase selection and split-phase action capability of the proposed protection scheme is verified by PSCAD/EMTDC simulation.

关 键 词：电流差动保护 模量电流 差动保护 同塔四回输电线 电容电流补偿 

分 类 号：TM773[电气工程—电力系统及自动化]