Laboratory tests of medium voltage switchgear isolators

This article presents results from laboratory tests of MV switchgear isolators, that were exposed to violent environmental conditions. Tests were carried out on support and bushings isolators. The problem occurred when accumulation of various active gaseous media in the interior of the MV switchgear and in contact with moisture form aggressive substances (i.e. acid). The tests setup with partial discharges detector and results from experiment were presented in the paper.