提高变压器严重故障时差动保护动作速度的方法  

Improving operation speed of differential protection for transformer at serious interior fault

作　　者：余荣云[1] 余高旺[2] 张丽青 杨恢宏[2] 

机构地区：[1]江苏省电力公司,江苏南京210026 [2]许继电气技术中心,河南许昌461000 [3]许昌市供电公司,河南许昌461000

出　　处：《继电器》2008年第2期13-15,共3页Relay

摘　　要：分析了变压器比率差动保护动作速度慢的原因和差流速断保护在应用中遇到的问题,根据故障时差动保护中动作电流与制动电流的比值关系,提出了增加快速动作区的解决差动保护快速动作的方案,并通过数模验证了该方案能够有效提高差动保护在区内严重故障的动作速度。By analyzing the cause of operation time of differential protection and the problem of over-current protection in application, a solution is proposed by adding the fast operation zone to improve the operation speed of transformer differential protection according to the relationship between differential current and restraint current. The numerical simulation results verify that this solution can effectively shorten the operation time of differential protection while the serious internal faults occurring.

关 键 词：变压器 差动保护 动作速度 

分 类 号：TM772[电气工程—电力系统及自动化]