DC-offset 영향을 최소화한 변압기보호 디지털 비율차동 계전알고리즘 구현

A Digital Current Differential Transformer Protecion Algorithm Minimizing the Effect of DC-offset

This paper presents a digital current differential protection algorithm for a transformer in power system. This algorithm uses an FIR filter to improve the performance of the relay. This paper presents a practical method setting the operating slope of the relay and reduce ct mismatch. A series of EMTP simulation results have shown effectiveness of the algorithm under various type of transformers and conditions.