A Novel Method to Improve the Location Accuracy of a Category of Fault Locators

It is very desirable to achieve high accuracy in fault location due to the increasing demands of fast detection and clearance of fault of transmission line. Most fault location algorithms incorporated in the fault recorders are based on the lumped parameter single-ended circuit model. Therefore, their accuracy is not satisfactory in many scenarios. A new revising scheme which can improve the accuracy of above type of methods is presented in this paper. The measured distance resulting from the lumped parameter circuit model is converted to the corresponding positive sequence measured impedance. Then, the relation between real distance and positive sequence measured impedance of fault circuit based on Bergeron model is be established. Thereby, the improved algorithm resulting from the relation of real distance and measured distance can be obtained. This paper presents the theory of the technique and the results of ATP simulation tests to demonstrate its performance.