Development and Application in Actual Switching Station of GIS Partial Discharge Locating System

Abstract

Gas-Insulated Switchgear(GIS) has very high reliability compared to Air-Insulated Switchgear (AIS), But any fault in it may once occur, the impacts due to it for modern society is vast and serious. The needs of predictive maintenance for GIS is on the rise, especially development of partial discharge sensor is strongly requested.
We have been developed the GIS partial discharge locating system whose advantages are simple construction, the least number of sensors, easy maintenance, and high reliability.
This paper describes about the basic experiment to develop the system, the principle of location of partial discharge source, application to the actual switching stations, Chubu Electric Power Co., Inc. TOYONE SW/S and consideration about the field data. We used the external type par-tial discharge sensor. The location of partial discharge can be calculated from the travel time differences between the partial discharge source and sensors. The data obtained in the SW/S shows the suggested algorithm for partial discharge judgment and location of partial discharge source is useful and function of external noise reduction effectively acts as we expected.