Development of compression method for fault data of digital protection relay using wavelet transforms

웨이블렛 변환을 이용한 디지털 보호계전기용 고장전류 데이터 압축기법 개발

Wavelet transforms provide basis functions for time-frequency analysis and have properties that are particularly useful for the compression of analogue point on wave transient and disturbance power system signals. This paper evaluates the compression properties of the discrete wavelet transform using actual power system data. The results presented in the paper indicate that reduction ratios up to 10:1 with acceptable distortion are achievable. This paper discussed the application of the reduction method for fault analysis and protection assessment.