차량 냉동기를 위한 디지털 필터 기반 디지털 모터 보호 계전기

Abstract

In the power systems on the commercial vehicle refrigerator that use 3-phase induction motor, analog signals may include harmonics and wave distortions which cause malfunctioning of the protection relay. In this paper, we propose digital protection relay to remove harmonics and unwanted noises using a digital filter. The proposed method utilize simple digital cosine filter suitable for the digital motor protection relay for the commercial vehicle refrigerator in real-time processing. The experimental results show the validity of the proposed method.