A study on the insulation breakdown of mica-epoxy composites

Economic factors prevalent at present and for the future mean that the remnant life of machine insulation and its assessment are important factors in the operation and maintenance schemes. In this paper, the chemical structure analysis of mica examined because generator stator winding which is manufactured recently have composed of mica epoxy composites. On components made of mica, a potassium ion of big atomic radius, is replaced by hydrogen ion of small atomic radius. The void created by the difference of these radius and they are progressed by combined stresses. Metal ions such as potassium which can be replaced by hydrogen in metal layers, is formed at the interface parts of mica-mica and mica-epoxy because these conductive layers are progressed with the connection as time goes by. The tree is generated by the effects of localized high electric field which is created in the adjacent areas of conductive layers.