Partial discharge - part X: PD in gas-insulated substations - measurement and practical considerations

This second article in a two-part series on PD testing of gas-insulated substations (GIS) provides an overview of engineering practice related to partial discharge (PD) measurements in GIS. The previous article discussed fundamental aspects of PD phenomena and measurements in solids and gases as relevant to this topic. This article will address the following questions: Why measure PD in GIS? In which phases of the life cycle should PD be measured? What PD measurements are presently available and what results can be expected under various measurement conditions?