UHF法によるGIS絶縁異常診断システムの開発

抄録

This paper describes the development of insulation diagnosis system of GIS using UHF (ultra high frequency) method which is detected by electromagnetic wave signal in UHF region. A new UHF partial discharge sensor with high sensitivity is developed based on the principle of dipole antenna. Its sensitivity is better than 0.3 pC. Identification of defects and discrimination from noise signal are developed by phase spectrum method of applied voltage. Moreover, the accuracy of diagnosis advances by a new method of neural network combined with frequency spectrum and phase spectrum.