Composite liquid insulators characteristics of palm and diala-b oil as transformer oil

This paper reports the effect of composite oil on breakdown voltage. The composite oil consists of palm oil and diala-b oil with various ratios. The objective of the experiments is obtain a breakdown voltage that was in accordance with the minimum standards of liquid insulators. It shows that the water content and acidity affect the breakdown voltage. The breakdown voltage of all composite oil samples that have treatment process meets the IEC standard No.56-1991 and SPLN 49-1:1982.