百万千瓦级机组发电机变压器组继电保护配置探讨

Discussion on protection configuration of 1000 MW generator-transformer unit

针对大型发电厂单机容量1000MW机组的发电机变压器组的结构特点和国内外的运行经验,对其继电保护配置中一些概念模糊的技术问题进行了调查研究。详细讨论了一些主要的保护配置特点,如中性点引出方式不同的发电机主保护配置方案,匝间保护的配置原则,主变压器的分侧差动和零序差动的配置方案,和其他保护的配置特点。简单分析了保护用电流互感器的选型问题,并结合目前实际应用的条件对1000MW机组的配置方案提出了建议。

Based on the structural feature and operational experience of 1000 MW generator-transformer unit,some unclear technological concepts of protection configuration are investigated. Main configuration features of some protections are discussed in detail,such as the main protection configuration scheme of generator with different neutral point leadout modes ,the principle of inter -turn protection configuration,configuration schemes of branch differential protection and zero-sequence differential protection for the main transformer,and so on. The selection of current transformer used in protection is analyzed simply,and the configuration scheme of 1000MW unit according to present practical application condition are suggested.