MineralÂ oilÂ isÂ knownÂ toÂ haveÂ aÂ lowÂ biodegradabilityÂ levelÂ andÂ high susceptibility to the fire. These conditions motivate many researchers to look for alternative sources for insulating oil. One of the alternative liquid is palm oil. To verify the suitability of using palm oil as an insulating liquid, it is important to make dielectric properties comparison with the commonly used insulating liquid. This paper presents comparison of temperature effect on dielectric properties of palmÂ oilÂ withÂ mineralÂ typeÂ insulatingÂ liquidÂ andÂ siliconeÂ oil.Â TheÂ measured parametersÂ wereÂ breakdownÂ voltage,Â dissipationÂ factorÂ (tanÂ Î´),Â andÂ dielectric constant.Â BreakdownÂ voltageÂ measurementÂ wasÂ performedÂ inÂ accordanceÂ with IECÂ 156Â standard,Â whereas,Â theÂ dissipationÂ factorÂ andÂ dielectricÂ constant measurementÂ wereÂ conductedÂ basedÂ onÂ IECÂ 60247Â standardÂ testÂ methods.Â The resultsÂ showedÂ thatÂ variationsÂ ofÂ dielectricÂ propertiesÂ ofÂ palmÂ oilÂ toÂ the temperature change, in general, have the same tendency with those of commonly used insulating liquids i.e. mineral oil and silicone oil. Breakdown voltages and dissipationÂ factorsÂ ofÂ allÂ testedÂ oilsÂ wereÂ increased,Â whileÂ theirÂ dielectric constants were slightly decreased with the increase of temperature.
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