Fault Line Detection of Non-Effectively Earthed Neutral System Based on Modulus Maximum Determining Polarity

The traditional signal analysis method couldn´t supply the part time-frequency characteristics of saltation signal. This paper analyzes the theory of fault line detection of non-effectively earthed neutral system based on modulus maximum determining polarity. A simulation of the non-effectively earthed neutral system is built here. It verifies the correctness and practicability of the method which is used in fault line detection, and shows a way of how to choose the wavelet function and the character scale. All of the results in this paper present a plausible way to transient protection and fault line detection.