Abstract
Mica sheets are a vital component of electrical machine insulation. Although great attention has been paid to partial discharges and their deteriorating effect on such insulation, relatively little attention has been given to surface discharges. This paper investigates the effect of water droplets, their volume, their conductivity, their positioning as well as their number on the flashover voltage of mica sheets. It is indicated that all the above mentioned parameters influence the flashover voltage
Highlights
Electric machines are a crucial part of an electric power system and their reliability highly depends on the durability of the insulation
A series of experiments was conducted with mica sheets, which are the hardest part of electrical machine insulation
During the 5 min interval there was a smooth progress of the droplet oscillation and deformation until the occurrence of partial discharges and the flashover
Summary
Electric machines are a crucial part of an electric power system and their reliability highly depends on the durability of the insulation. One can conclude that the role of the electric machine insulation is to keep the live parts separated from the grounded ones and to endure the mechanical, thermal and chemical stresses. In other words, such insulation may suffer from multiple stresses, which far too often apply at the same time. A series of experiments was conducted with mica sheets, which are the hardest part of electrical machine insulation. The behavior of water droplets on mica sheets under the influence of uniform electric fields was studied. The experimental parameters studied were the water conductivity, the number, the position and the volume of the droplets and the surface roughness of the mica sheets [5]
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