OPIS I ANALIZA KVAROVA TRANSFORMATORSKIH 110 kV PROLAZNIH IZOLATORA

Transformer 110 kV bushings are of the capacitor type. Various designs are used technologically, such as resin bonded paper, resin impregnated paper and oil impregnated paper. In terms of construction, porcelain insulators were mostly used, and more recently, composite insulators with a silicone coating. In the failures of 110 kV transformers, bushings participate in a significant percentage. Failures of 110 kV bushings can be severe and include destruction of the 110 kV bushing due to failure inside 110 kV bushing, and in most cases damage to surrounding equipment and devices of the transformer and other equipment near the transformer due to explosion of porcelain and fire and damage of the transformer interior. In a small number of cases, only the faulty 110 kV bushing will be destroyed. Severe failures also include damage to 110 kV bushings due to an electric arc caused by birds flying between 110 kV bushings or strong atmospheric discharges. Severe failures also include those where, due to the structurally poorly constructed 110 kV bushing, it is caused to loosen. Minor failures caused by mechanical damage, aging of transient insulators, electrical damage caused by aging or other causes are possible. Minor failures may result in the need to replace the 110 kV bushing, as well as to replace or repair part of the 110 kV bushing. Measures are proposed to improve the reliability of 110 kV bushings, reduce the number of failures and reduce damage caused by failures.