Transformers Oil Static Electrification Analysis by Using Closed Cycle System

Static electrification of transformer oil due to oil circulation is main reason of several breakdown in power transformers. In last twenty years nominal power and voltage of transformers are increased rapidly, therefore analysis of this phenomena is very important. In the present paper mechanism of charge production and accumulation, which leads to breakdown is described. Closed cycle test configuration is used to investigating the phenomena and theoretical calculation is presented. Finally the effects of temperature, oil circulation velocity and oil stop on phenomena is investigated and analyzed.