Transformer oil, a type of insulating and cooling oil used in transformers and other electrical typically 5 repetitions, depending on the standard. As a result the breakdown voltage is calculated as mean value of the individual measurements. Low value of BDV indicates presence of moisture content and conducting substances in the oil. For measuring BDV of transformer oil, portable. In this article, I will discuss transformer oil sample tests other than dissolved gas analysis (DGA). Lower values are indicative of damp or dirty oil. Moisture.

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And generator also two part after out put power one circle wiring second avear transfer power See More. In this kit, oil is kept in a pot in which one pair of electrodes are fixed with a gap of 2. This is also known as neutralization number. A rating of 30 kV is the minimum breakdown voltage at which transformer oil can be safely used in a power transformer. Although Paraffin-based oil has the disadvantage as mentioned earlier but still in our country, we use it because of its easy availability.

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This may be due to sludge deposition on shell winding. The Dielectric Strength of transformer oil is very important since it is essential in maintaining the reliable operation of power transformers.

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Upvote 2 Downvote Reply 1 Report. Good oil should have a low viscosity so that it offers less resistance to the conventional flow of oil thereby not affecting the cooling of a transformer. Electrical power equipment maintenance and testing. That means at which voltage dielectric strength of transformer oil between the electrodes has been broken down. Pour point of transformer oil is a valuable property mainly at the places where the climate is icy.


Here voltage means the instantaneous voltage between live part and ground of the equipment. Breakdown Voltage is measured by observing at what voltage, sparking straits between two electrodes emerged in the oil, separated by specific gap.

Every liquid becomes more viscous if the temperature decreases.

Transformer Insulating Oil and Types of Transformer Oil

In addition to these, this oil serves other two purposes, it helps to preserve the core and winding as these are fully immersed inside oil, and another important purpose of this oil is, it prevents direct contact of atmospheric oxygen with cellulose made paper insulation of windings, which is susceptible to oxidation.

Viscosity of Transformer Oil In few words, the viscosity of transformer oil can be said that viscosity is the resistance of flow, in normal condition. To assess the insulating property of dielectric transformer oil, a sample of the transformer oil is taken and its breakdown voltage is measured.

Parameters of Transformer Oil The parameters of transformer oil are categorized as, Electrical parameters: But in reality, no insulating materials are perfect dielectric in nature. But in the case of Paraffin oil although oxidation rate is lower than that of Naphtha oil the oxidation product or sludge is insoluble and precipitated at the bottom of the tank and obstruct the transformer cooling system.

By using this site, you agree to the Terms of Use and Privacy Policy. Chemical Parameters of Transformer Oil Water Content in Transformer Oil Moisture or water content in transformer oil is highly undesirable as it affects the dielectric properties of the oil adversely.

Dear Abin VargheseThe dielectric strength of new insulating oil shall be measured in accordance with the following ASTM testing methods: Clean oil with a low moisture content gives higher BDV results than oil with high moisture content and other conducting impurities.

Dielectric strength means the maximum capacity to withstand voltage of insulating oil.

Specific Resistance of Transformer Oil This is another important property of transformer oil. Properties of Transformer Insulating Oil Some specific parameters of insulating oil should be considered to determined the serviceability of that oil.


Transformer oil testing

Hence it is desirable to have loss angle as small as possible. Hence current through the insulator will lead the voltage with an angle little bit shorter than 90 o. Your email address will not be published. Irrelevant to Specialties or not an answer. Please help improve this article by adding citations to reliable sources. That is why this oil is also known as mineral insulating oil. Just after charging a transformer after long shut down, the temperature of the oil od be at ambient temperature and during full load, the temperature will be very high and may go up to 90 o C at an overload condition.

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Transformer oil testing – Wikipedia

Also known as the sparking strength, the higher the voltage required to jump the spark, the higher the BDV will be in the oil. The specific resistance of oil is a measure of DC resistance between two opposite sides of one cm 3 block of oil.

Amorphous metal transformer Austin transformer Autotransformer Buck—boost transformer Capacitor voltage transformer Distribution transformer Delta-wye transformer Energy efficient transformer Flyback transformer Grounding transformer Instrument transformer Current transformer Potential transformer Isolation transformer Linear variable differential transformer Pad-mounted transformer Parametric transformer Planar transformers Rotary transformer Rotary variable differential transformer Scott-T transformer Solid-state transformer Trigger transformer Variable-frequency transformer Zigzag transformer.

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