变压器过激磁保护分析及改进

Operation analysis on overexcitation protection for transformer and its improvement

通过介绍微机型变压器过激磁保护装置的构成及基本原理,从铁磁谐振角度出发分析了电压互感器二次侧电压不平衡现象,分析误动原因,并提出改进方案。实验及仿真分析表明所提方案理论上可行、应用中正确,可以有效解决变压器过激磁保护误动问题,从而对工程应用起到指导和改进的积极作用。

From ferroresonance perspective, the paper analyzes the voltage unbalance apearance at the secondary side of potential transformer and the reason of misoperation after illustrating the constitution and basic principles of microcomputer overvoltags ＆ overcexcitation protection and proposes the improvement scheme. Experiment and simulation analysis indicates that proposed scheme is fealsible in terms of the theory and applicable. It can resolve efficiently the problem of misoperation of overexcitation protection for transformer, thus it can play positive roles to direct and improve engineering application.