PROBABILITY OF PARTIAL DISCHARGE DETECTION IN AGED GIS DUE TO VOID IN EPDXY

For more than 20 years, PLN, the electricity utility company in Indonesia, has been operating GIS substations at 150 and 500 kV. 30% of the operated GIS are already in service for at least 10 years and served a quite high load. Afterwards, these substations are categorized as aged GIS. During these years some unnecessary outages occurred without any early notification. In other words, no alarm was generated since no monitoring method was installed. Even though the 'system' was claimed as the main cause, the 'GIS equipment' was also playing an important part (29% at 150 kV and 46% at 500 kV)4, see figure 1.