TA深度饱和及变比选择问题的探讨  

Study on the deep-saturation of TA and transformation ratio selection

作　　者：梅姚[1] 陈新[1] 赵毅[1] 王春光[1] 陈文彬[1] 

机构地区：[1]甘肃电力调度通信中心

出　　处：《科技致富向导》2011年第35期315-315,314,共2页Guide of Sci-tech Magazine

摘　　要：由于系统容量增大或系统结构等原因，高压变电所10～35kV侧出线在近处短路时出现的特大电流，大大超过了电流互感器（TA）的10％误差曲线所容许的电流倍数，严重影响保护装置正确动作。文中对某110kV变电站10kV线路出口发生三相短路，TA深度饱和致使保护装置未能快速动作的事故进行了分析，并就特大电流下TA深度饱和对微机保护的影响及TA变比的选择提出了意见。Based on capacity increase or structure change of the power system, an extra-high current may appear in 35kV orl0kV outlet of high voltage substations when a short-circuit fault happens nearby. It greatly exceeds the permitted value of 10% error curve of protection current transformer （TA） and affects the performance of relevant protect equipment. A fault that fast action failure of protection caused by deep-saturation of TA when three-phase short circuit occurs on the 10 kV outlet of a ll0kV substation is analyzed. Also the influence of TA deep-saturation on relay protection device, and the suggestions of transformation ratio selection are presented.

关 键 词：电流互感器(TA) 深度饱和 变比 继电保护 

分 类 号：TM452[电气工程—电器]