Effect of metallic particle contamination in different types of Oil

Abstract

AC breakdown test are usually used for quality check of mineral oils during transformer operation.Transformer
oil is one of the most essential components for conventional oil immersed transformers as it acts both as electrical insulation
and thermal coolant.The dielectric strength of the oil and more specifically the level of oil contamination determine the
dielectric safety margin of the transformer insulation system. In addition, transformer oil may be used in power transformers
for decades without changing. Insulation oil in power transformers serves as a heat transfer medium and as an insulating
liquid.The oil board insulation system is still of big importance for the insulation of electrical power equipment such as HV
transformers, current and voltage transformers, power circuit breakers and oil filled cables.The influence of particles on the
voltage breakdown in insulating oil and other liquids has been recognized for many years.In this work an effort has been
made to study breakdown voltage(BDV) in transformer oil with different electrode configuration with and without particle
contamination.