차동전류 보호계전을 위한 변압기 특성분석

Analyses of Transformer Characteristics for Current Differential Protective Relaying

Simulation methods using EMTP to analyze power transformer transient characteristics and their interesting results are presented in this paper. Because of the transformer saturation including initial inrush, the conventional current differential relay with harmonic restraint module does not provide a clear distinction between internal faults and other conditions. Providing the bases to develop a new relaying concept for power transformer protection, transformer nonlinear transient characteristics are analyzed.