Travelling wave velocity measurement in fault location based on travelling wave for high voltage transmission line

In fault location system based on travelling wave, the measurement accuracy of travelling wave velocity influenced the fault location accuracy to a certain extent. On the basis of analyzing the factors influencing the measurement accuracy of travelling wave velocity, the influence of travelling wave velocity on fault location accuracy and existing travelling wave velocity measuring methods, the authors proposed that for the faults beyond the protection zone the two terminal travelling wave fault location system itself can be used to measure the travelling wave velocity, thus, the on-line measurement and adjustment of travelling wave velocity were implemented. Both theoretical analysis and measured data indicate that the proposed method is easy to implement and it is effective for the improvement of fault location accuracy based on travelling wave.