Effect of Temperature Change of Liquid Isolator Based on Composite Diala B Oil and Palm Oil as Transformer Oil

The purpose of this study is to determine the characteristics of palm oil as a substitute for mineral oil in its use as transformer oil. This study examined palm oil and diala B oil with variations in temperature changes between the two oils. Testing was conducted to obtain a minimum standard value of liquid isolator at the level of temperature variation for transformer oil. The results are compared with the standard liquid isolator to determine the feasibility of mixed oil as a liquid isolator. From the testing results, the value of oil breakdown voltage from 30° C to 100° C has the same increasing tendency, all oil samples meet IEC standard No.56 of 1991 which is above the standard at 60° C (standard ≥ 30kV/2, 5mm).