一种新型变压器差动保护起动元件

A New Transformer Differential Protection Starting Component

在电力变压器中,励磁涌流会引起变压器差动保护误动作。针对这一问题,提出一种新型的变压器差动保护起动元件———基于小波变换的行波识别起动元件,并且通过MATLAB中的simulink和wavemenu进行仿真。仿真结果表明,该起动元件可以正确识别励磁涌流与内部故障电流,从而能有效避免差动保护误动作。

Excitation inrush currents in a power transformer might result in differential protection misoperations.The paper presents a novel approach to this problem.A new transformer differential protection starting component based on wavelet transform wave identification is proposed,and simulations are performed with simulink and wavemenu of MATLAB.Simulation results show that the starting component can correctly distinguish excitation inrush currents from internal fault currents,and thus the differential protection misoperations can be effectively avoided.