华东电网500kV联络变压器过励磁保护运行情况分析  

Operational Analysis on 500 kV Coupling Transformer Over Excitation Protection in East China Power System

作　　者：聂宇本[1] 

机构地区：[1]华东电力调度局,上海200002

出　　处：《电力设备》2001年第1期48-51,共4页Electrical Equipment

摘　　要：变压器过励磁运行对变压器的寿命和绝缘造成损害,现代大型变压器运行均要求装设过励磁保护。但由于变压器过励磁工况与正常工况之间的差别很小(5％～10％),给过励磁继电器的动作裕度很小,整定运行很难做到两全。文中介绍了华东电网500kV 联络变压器过励磁保护的配置及运行情况,总结经验,提出存在的问题,希望从测量回路的精度、继电器的动作精度、返回系数以及继电器的构成原理和保护考核等方面综合考虑,以提高该保护的投运率。Transformer over-excitation operation is harmful to transformer's life span and may cause damage to insulation,therefore, modern large power transformers are required to instal over-excitation protection.Because of small difference between over-excitation operation and normal operation condition (5%～10%),the operational margin of over-excitation protection is very small,it is diffi- cult for relay setting.This paper introduces the deployment and operation conditions of over excitation protection for 500 kV coupling transformers in East China Power Network.Through summarizing operational experience,problems existing and comprehensive con- siderations,it is hoped to promote availability of the relay protection by improving the accuracy of measuring circuits,relay action, reset rate and relay protection theories.

关 键 词：变压器 电压 频率 过励磁 保护 

分 类 号：TM772[电气工程—电力系统及自动化]