Combined broad and narrow band multichannel PD measurement system with high sensitivity for GIS

Abstract

A computer controlled GIS (gas insulated switchgear) PD (partial discharge) measurement system is presented which combines UHF broad and narrow band PD measurements with high sensitivity, multichannel performance and near real-time response. Each measurement channel consists of a low noise broadband sensor amplifier with automated high voltage transient protection, a full band power/envelope detector, a narrow band spectrum analyzer interface and a computerized display unit. With 0.1 to 2.0 GHz frequency range, 3 dB noise figure, 40 dB of sensor amplifier gain, full flashover and switching transient protection, twelve measurement channels, less than 0.1 second response time and a user friendly computer interface, the presented system is optimally suited for on-site commissioning tests, for laboratory testing during development and for long term monitoring of complex GIS. This system allows the detection, localization, identification and monitoring of fault sources using a fully electrical method.