Fault detection for power transmission line by use of M-sequence correlation

Monitoring a power transmission line is significant for power electric companies. In this paper, we propose a new method for detecting an fault point of power transmission line by use of M-sequence correlation technique. In this method, detecting signal is used as plural M-sequences ( same characteristic polynomial, including normal and reverse mark, synchronized). In receiving point, we make same sequence with the input one and take crosscorrelation function between M-sequence and the received signal. We can see transfer functions of plural paths between inputs and output taps separated from different of delay times on the crosscorrelation function, and from these transfer functions, so we compare them when fault occurred with in usual.