大型自并励发电机短路电流特点及相关保护问题  

Large-scale Self Shunt Generator Short-circuit Current Characteristics and Related Protection Problems

作　　者：巨争号 

机构地区：[1]神华国能(神东电力)集团公司技术研究院,陕西西安710065

出　　处：《神华科技》2013年第3期56-60,64,共6页Shenhua Science and Technology

摘　　要：大型自并励同步发电机外部短路时,其短路电流稳态分量较常规励磁可忽略不计,并且短路电流暂态分量变化规律不同。本文从分析大型自并励发电机短路电流入手,通过对一实际自并励发电机模型外部短路电流计算,分别对相关的发电机复压闭锁过流,不同短路点强励动作进行了计算校核,并对自并励变压器保护整定应注意的问题及自并励励磁调节器各限制器的限制特性与发变组保护之间的配合关系进行了论述。The short circuit current steady-state components can be neglected compared the conventional excitation while external short circuit and the change law of short-circuit current transient component is different in large self shunt generator. This paper starts from the analysis of short-circuit current of large self shunt generator, through the calculation of external short circuit current for an actual self shunt generator model, also calculated the related repressing lockout over-current of generator and strong excitation action of different short-circuit points respectively. Discuss the excitation transformer protection setting problems that should be paid attention to, and the cooperation relationship between the limit characteristics for limiter of self shunt excitation regulator and generator-transformer unit protection.

关 键 词：自并励 发电机 外部短路 复压闭锁过流 强励校核 励磁变保护 

分 类 号：TM7[电气工程—电力系统及自动化]