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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Transformer Insulating Oil and Types of Transformer Oil

Under the action of the electric field of the emulsified oil, droplets of water are drawn to places where the field galue is particularly high. Low value of BDV indicates presence of moisture content and conducting substances in the oil. This mixture gives momentary flash on the application of flame under standard condition. Please make sure that your answer is written in the same language as the question. Pour point of transformer oil is a valuable property mainly tranfsormer the places where the climate is icy.

Dielectric Strength of Transformer Insulating Oil

A rating of 30 kV is the minimum breakdown voltage at which transformer oil can be safely used in a power transformer. Upvote 2 Downvote Reply 1 Report. Powered by GDPR plugin. Paraffin-based oil has iil higher value of pour point, compared to Naphtha based oil, but in India like country, it does not affect the use of Paraffin oil due to its warm climate condition. Although Paraffin-based oil transfoemer the disadvantage as mentioned earlier but still in our country, we use it because of its easy availability.

Pour Point of transformer oil mainly depends upon wax content in the oil. The dielectric strength of the oil will decrease with time and based on the service conditions where the transformer is located. Another problem with paraffin-based oil is its high pour point due to the wax content, but this does not affect its use due to warm climate condition vlaue India.


Minimum breakdown voltage of transformer vxlue or dielectric strength of transformer oil at which this oil can safely be used in transformer, is considered as 30 KV. This measurement is taken 3 to 6 times in the same sample of oil, and we take the average value of these readings.

Leave a Reply Cancel reply Vlaue email address will not be published. The water content in oil also affects the paper insulation of the core and winding of a transformer. What’s the difference between power transformer and reactor? As an insulating material is dielectric in nature the current through the insulation ideally leads the voltage by 90 o. If regular filtration is done for the oil there is no ojl of sample analysis.

Is Synchronous check relay system for two power transformers compatible to be used to make synchronizing between power transformer and generator? Transformer needs oven baking. Hence it does not obstruct convection circulation of the oil, means balue does not disturb the transformer cooling system. What is the main different between the power transformer and voltage transformer?

Transformer oil testing – Wikipedia

Hence current through the insulator will lead the voltage with an angle little bit shorter than 90 o. During oxidation, acids get formed in the oil the acids give rise to the solubility of water in the oil. Do you need help in adding the right keywords to your CV? In transformer oil has mainly two purposes, first for insulation, second as cooling of Transformer core and other winding. This means that every time you visit this website you will need to enable or disable cookies again.


Question already answered Please make sure that your answer is written in the same language as the question. The Dielectric strength of transformer oil is also known as the breakdown voltage of the transformer oil. That is why specific resistance or resistivity of transformer oil should get measured at 27 o C as well as 90 o C. BDV is an important and popular test of transformer oil, as it is the primary indicator of the health of oil and it can be easily carried out at the site.

Tangent of the angle by which it is short of 90 o is called dielectric dissipation factor or simply tan delta of transformer oil. Operational properties of transformer oils are checked by electrical insulating and physico- chemical characteristics:.

Transformer Insulating Oil and Types of Transformer Oil

Follow Upvote Report Question Comments 1. Unfortunately, the answer you are trying to submit has already been added. If oil becomes acidic, the water content in the oil becomes more soluble in the oil.

You can adjust all of your cookie settings transforker navigating the tabs on the left hand side. Please help improve this article by adding citations to reliable sources. In this kit, oil is kept in a pot in which one pair of electrodes are fixed with a gap of 2. There are various manufacturers of portable oil testers.

For distribution neutral is required for that star connection is used for LT side of Transformer See More. Learn how your comment data is processed. Thus, the dielectric quality of transformer oil is essential to secure operation of a transformer.