某电厂主变保护PT断线报警分析  

Analysis of PT Disconnection Alarm of Main Transformer Protection in a Power Plant

作　　者：张力文 ZHANG Liwen(Shajiao‘C’Power Station of Guangdong Energy Group Co.,Ltd.,Dongguan 523000,China)

机构地区：[1]广东省能源集团有限公司沙角C电厂,广东东莞523000

出　　处：《电工技术》2021年第13期196-198,共3页Electric Engineering

摘　　要：针对一起厂内主变保护PT断线报警故障,根据保护逻辑图及录波信息,利用系统等效模型分析500 kV系统发生两相接地故障时,3台主变低压侧负序电压大小差异及报警情况不一致的原因,得出厂用电保护定值整定时应充分考虑系统故障对其影响的结论。In view of an in-plant main transformer protection PT disconnection alarm fault,according to the protection logic diagram and recording information,the system equivalent model is used to analyze the reason for the difference in the magnitude of the negative sequence voltage on the low-voltage side of the three main transformers and the inconsistent alarm conditions when a two-phase ground fault occurs in a 500 kV system.It is concluded that the influence of system fault should be fully considered when setting the setting value of factory power consumption protection.

关 键 词：保护逻辑 录波信息 等效模型 

分 类 号：TM774[电气工程—电力系统及自动化]