摘要
介绍了某发电机额定电压合闸于空载变压器时发电机差动保护误动的事故概况。通过深入分析,指出事故原因是差动保护启动值整定不合理及穿越性励磁涌流导致TA暂态饱和。根据事故原因分析,提出了修改保护定值的处理措施;并对保护用电流互感器的选型及设计提出了相关建议,以期提高发电机差动保护的运行可靠性。
This paper introduces an accident of generator differential protection misoperation when the generator at rated voltage switches on no-load transformers. The causes are identified through in-depth analysis as the unreasonable setting of start value of differential protection and the through magnetizing inrush current which lead to the TA transient saturation. This paper puts forward the treatment measures of modifying the fixed values of differential protection and makes suggestions on type selection and design of protection current transformer in order to improve operation reliability of generator differential protection.
出处
《浙江电力》
2011年第7期47-49,共3页
Zhejiang Electric Power
关键词
发电机
差动保护
励磁涌流
TA暂态饱和
误动
generator
differential protection
excitation inrush current
TA transient saturation
misoperation
