电网波动对主变压器过激磁保护影响分析及其整定策略  

Analysis on Affect of Power Grid Fluctuation on Main Transformer Over-excitation Protection and Setting Strategy

作　　者：邱建[1] 丁晓兵[1] 陈朝晖[1] 梅勇[1] 李捷[1] 李正红[1] 

机构地区：[1]中国南方电网电力调度控制中心,广东广州510623

出　　处：《广东电力》2017年第4期21-24,36,共5页Guangdong Electric Power

摘　　要：针对近年南方电网范围内2起主变压器过激磁保护异常事件,结合过激磁保护基本原理,对其原因进行了分析总结。根据云南异步联网后电网波动情况,大扰动情况(故障情况)下过激磁倍数大于1.05倍的状态持续时间为秒级,正常运行时最大过激磁倍数可达1.05倍。在此基础上,分析了电网波动对主变压器过激磁保护的影响,揭示了过激磁保护整定风险,并提出了相应的整定策略,建议过激磁保护定值下限按不小于1.08倍整定。In allusion to two cases of abnormal over-excitation protection of themain transformer this paper analyzes and summarizes reasons by combining with basic principle of over-excitation protection. According to sit-uation of power grid fluctuation after asynchronous networking with Yunnan power grid, t discovers sustained time is in sec-ond level when over-excitation times are more than 1 .05 in the case of large disturbance , times under the normal operation condition can reach to 1 . 05. Furthermore , it also analyzes influence of power grid fluctua-tion on over-excitation protection of the main transformer , reveals setting risks in over-excitation protection and proposes corresponding setting strategy. It suggests to set the lower limit of setting value of over-excitation protection to be more than 1. 08.

关 键 词：过激磁 异步联网 电网波动 定值下限 整定策略 

分 类 号：TM774[电气工程—电力系统及自动化]