HYBRID LINE FAULT POINT POSITIONING METHOD BASED ON SINGLE-END ELECTRICAL QUANTITY AND COMPREHENSIVE TRANSIENT TRAVELLING WAVE CHARACTERISTIC ANALYSIS

摘要

A hybrid line fault point positioning method based on a single-end electrical quantity and a comprehensive transient travelling wave characteristic analysis. The method mainly comprises: step 1, performing phase-mode transformation; step 2, searching for an initial fault time; step 3, extracting timing window data after the initial time; step 4, searching for a fault point reflection wave and a dividing point reflection wave in a timing window; and step 5, determining the property of the reflection waves. When a fault occurs in a cable-overhead hybrid line, the case where a fault point is located at an overhead line segment or a cable segment is quickly determined by identifying and comparing the comprehensive characteristics of a single-end transient voltage, a fault point reflection wave of a current travelling wave and primary and secondary dividing point reflection waves. The method is used for assisting with a line reclosing switching decision.