Abstract
Recently, investigations of diagnostic method for determining the deteriorating conditions of an insulating material using microcomputer have been carried out. It is already known that sometimes partial discharge in a gap, such as a void in insulation or between insulation and a conductor, may lead to the deterioration of the polymer and finaly to be breakdown of the insulation system. Research is still underway to establish a diagnostic which can aid in the determination of the deteriorating condition of an insulation materials.
In this paper, a wide and flat artificial void which is bounded by thin polyethylen sheet on either side is used for experiments. The characteristics of the gaseous discharge products, are measured by the infrared spectrometer during the discharge condition. At the same time, the distribution of the discharge magnitude according to the phase angle of the applied voltage with a discharge pulse measurement system. In order to understand the relationship between the gaseouse discharge products and the discharge measurements, the correlation coefficients were calculated.
In results, the swarming pulsive micro discharge is shown clear by the measurements of the discharge magnitude distribution according to phase angle. The relation between the occurence pattern of the gaseous discharge products and the swarming pulsive micro discharge is made clear. The gaseous discharge products are correlated with seveal electrical discharge parameters.
