Analysis and Measures of Sympathetic Inrush Cause Protection Equipment Misoperation
Cause Analysis on the misoperation of Generator Differential Protection by means of comparing with wave form. Introduce the principle and features of sympathetic inrush, influence of non-periodic components on transient saturation of current transformer. Through the different view on reducing the sympathetic inrush and actual onsite, adjust Generator Differential Protection setting from 0.09pu to 0.25pu, and test the second- ary circuit load impedance and Volt-Ampere Characteristic. Through Inspecting TA Volt-Ampere Characteris- tic,the accuracy of TA, the secondary circuit load to meet the error requirement, reduce the misoperation of neighbor protection equipment by sympathetic inrush when system happen sudden change.
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