The extraction of the travelling wave signal is the starting point of the location of the traveling wave error According to its physical characteristics, the travelling wave signal is divided into voltage-travelling wave and current-travelling wave. The frequency band covered by the error passing wave is very wide, up to a few hundred kilohertz, up to a few thousand deer change. Early research considered that ordinary voltage and current transformers, due to their easy saturation characteristics, could hardly complete the transmission of high frequency errors of passing wave signals, so special coupling equipment seemed to collect erroneous wave signals, But because of their limited applicability and high costs it is difficult to promote. In the course of the investigation it was found that, although ordinary transformers are distorted when sending high frequency signals, they can still characterise the characteristics of the travelling wave after correct correction.<br>
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