A diagnostic technique to assess the operating state of high voltage apparatus

A subject of considerable interest at the present time is the development of diagnostic techniques to assess the operating state and predict the remaining life of electrical power equipment in service. Such techniques can help to reduce unscheduled outages, improve maintenance planning and increase system reliability. The life of a high voltage apparatus usually depends upon the operating state of its electrical insulation. An analysis of the fundamental dielectric processes has shown that the polarization phenomena are strongly influenced by the morphology and degradation of the polymeric insulation. Hence, the polarization spectrum should yield information on the operating state of the insulation. A technique for measuring the depolarization current after dc charging is described in the present study. >