2000 Volume 84 Issue 8 Pages 486-491
A method is described for detecting a light-source position that can be used to find partial discharges in gas-insulated switchgears as an indication of a fault. Comparing the illuminances measured by light sensors to those in a database gives information about the light-source position. The database is built beforehand using illuminance distributions, computed by the Monte Carlo method, for each given light source in a lighting space. In the database, the set of measured illuminances for a light source is treated as a position in a fictitious space or plane. This method was tested for a simple cubical room by using the Monte Carlo method to compute illuminances created on sensors by test light sources and by estimating the accuracies of detection. The maximum effective accuracy obtained when expanding the detected space to a neighborhood space was 86.9%. The detected accuracy improved that the light sensors were placed near a corner of the room. The positional arrangement of the light sensors, therefore, should be optimized. Building the database more or less affected the accuracy as well. Once the database is built, the calculation should take little time. This method should thus be useful for quickly identifying fault points in gas-insulated switchgears.
