A CT Saturation Detection Algorithm Based on the Analysis of the Saturated Current Using Wavelet Transformation

Abstract

In this paper, distorted current relaying signals due to the CT saturation are analyzed with WT (Wavelet Transformation). Daubechies 2 is used as the mother wavelet. The output level (detail) of multi-level filter banks and the sampling frequency are also analyzed. The first output level of the multi-level filter banks for the output level (detail) and the 3,840Hz of the sampling frequency are adopted. A series of test results show that the proposed algorithm detects the saturated region accurately under various faults and CT conditions of a C800 CT model.