灭磁时间对发电机—变压器组保护影响的分析与对策  

Analysis and Measures of Generator De-excitation Time Influence on Generator-transformer Set Protection

作　　者：陈水耀[1,2] 黄少锋[1] 徐灵江[2] 裘愉涛[2] 

机构地区：[1]华北电力大学电气与电子工程学院,北京市102206 [2]浙江省电力公司,浙江省杭州市310007

出　　处：《电力系统自动化》2011年第2期97-99,共3页Automation of Electric Power Systems

摘　　要：发电机在灭磁过程中定子仍有电压,维持故障电流。如果灭磁时间长,将影响发电机—变压器组保护的动作可靠性。2起实际案例表明,灭磁速度慢会导致发电机—变压器组保护的动作元件不能及时返回。为消除灭磁过程的影响,分析了发电机—变压器组后备保护、断路器失灵启动保护、断口闪络保护的动作逻辑,有针对性地提出了对策。There is still some stator voltage to maintain fault current of the generator during de-excitation process.Long de-excitation time may affect the action reliability of generator-transformer set protection.There were two actual cases showing that the actuating components of generator-transformer set protection were not return on time caused by slow de-excitation speed.In order to eliminate influence of de-excitation process,the action logic among generator-transformer set back-up protection,breaker failure start protection and breaker flashover protection is analyzed,and finally some targeted measures are proposed.

关 键 词：灭磁时间 发电机—变压器组保护 动作元件 

分 类 号：TM307[电气工程—电机]