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Two types of esters derived from vegetable oil, triglyceride (tri-ester) and monoester, have been implemented as insulation in the oil filled transformer. Tri-ester type is superior in flash point but inferior in viscosity and pour point compared to the monoester type. An accelerated aging test is an important test to assess a long time performance of an insulation system. Two kinds of monoesters,...
Palm fatty acid ester (PFAE) oil is an alternative insulating liquid of power transformer that has good biodegradable properties. As a part of insulating system of power transformer, PFAE should also has a low risk in term of static electrification that may degrade electrical strength of solid insulation due to charge accumulation at its surface during oil circulating. Charge potential value could...
In oil-immersed transformers, static electrification phenomenon is caused by insulating oil flowing on solid insulator such as pressboard (PB). In Japan, as a countermeasure, 1, 2, 3-benzotriazol (BTA) is used to suppress static electrification. But, recent years, it has been reported that static electrification phenomenon increases with aging owing to oxidation of insulating oil, operation history...
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