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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More plainly, the leakage current through insulation does have two component one capacitive or reactive, and another one is resistive or active.

Electrical Standards: Transformer Oil Testing; IS for Transformer oil; Transformer BDV values

Thank you for answering the question. By using this site, you agree to the Terms of Use and Privacy Policy. Low viscosity of transformer oil is essential, but it is equally important that the viscosity of oil should increase as less as possible with a decrease in temperature.

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So testing of oil is done according to voltage rating.

Transformer Insulating Oil and Types of Transformer Oil

As transformer oil deteriorates through aging and moisture ingress, transformer oil should, depending on economics, transformer duty and other factors, be tested periodically. Dielectric Strength of Transformer Insulating Oil. It is therefore, important to keep the transformer oil as free from such contaminates as possible. Views Read Edit View history. Hence it is desirable to have loss angle as small as possible. Electrical power equipment maintenance and testing.


This test shows vapue dielectric strength of Transformer oil. So resistivity of the insulating oil must be high at room temperature and also it should have good value at high temperature ojl well.

September Learn how and when to remove this template message. Articles needing additional references from September All articles needing additional references. This trqnsformer is taken 3 to 6 times in the same sample of oil, and we take the average value of these readings. Break down voltage is measured by observing at what voltage, sparking strants between two electrods immerged in the oil, separated by specific gap. Check for similar questions. The acidity of oil deteriorates the insulation property of paper insulation of winding.

If regular filtration is done for the oil there is no need of sample analysis. Please help improve this article by adding citations to reliable sources.

A rating of 30 kV is the minimum breakdown voltage at which transformer oil can be safely used in a power transformer. High resistive insulation is a good insulator.

Question already answered Please make sure that your answer is written in the same language as the question. Although Paraffin-based oil has the disadvantage as mentioned earlier but still in our country, we use it because of its easy availability.

This website uses cookies to improve your experience. Thus the temperature of the oil at the time of taking a sample for the test is critical. Here voltage means the instantaneous voltage between live part and ground of the equipment. The owner has blocked you Answer should contain a minimum of 25 characters. Views Followers 6 Upvote 0.

The accurate measurement of water content at such low levels requires very sophisticated instrument like Coulometric Karl Fisher Titrator. You can adjust all of your cookie settings by navigating the tabs on the left hand side.


Privacy Overview This website uses cookies so that we can provide you with the best user experience possible. In transformer oil has mainly two purposes, first for insulation, second as cooling of Transformer core and other winding. Resistance to flow of transformer oil means obstruction of convection circulation of oil inside the transformer.

Upvote 0 Downvote Reply 0 Report. But in reality, no insulating materials are perfect dielectric in nature. From Wikipedia, the free encyclopedia.

Dielectric Strength of Transformer Insulating Oil

Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit for purpose. The water content in oil also affects the paper insulation of the core and winding of a transformer. Its unit is ohm-cm at a specific temperature. The transformer oil insulation oil of voltage- and current-transformers fulfills the purpose of insulating as well as cooling.

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This is because it tends to deteriorate over time. Please make sure that your answer is written in the same language as the question. The dielectric strength of transformer oil is mainly determined by the presence of acids, water, and other contaminates.

Specific Resistance of Transformer Oil This is another important property of transformer oil. The Dielectric strength of transformer oil is also known as the breakdown voltage of the transformer oil.