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.

Author: Meztik JoJorr
Country: Pakistan
Language: English (Spanish)
Genre: Video
Published (Last): 26 December 2018
Pages: 373
PDF File Size: 19.85 Mb
ePub File Size: 2.78 Mb
ISBN: 682-5-94411-134-2
Downloads: 9166
Price: Free* [*Free Regsitration Required]
Uploader: Tenos

It is normally obtained by fractional distillation and subsequent treatment of crude petroleum. Transformer needs oven baking.

Acidity accelerates the oxidation process in the oil. So resistivity of the insulating oil must be high at room temperature and also it should have good value at high temperature as well.

The accurate measurement of water content at such low levels requires very sophisticated instrument like Coulometric Karl Fisher Titrator. 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.

Why do we need to do oil analysis for oil immersed power transformers? This article needs additional citations for verification. Resistance to flow of transformer oil means obstruction of convection circulation of oil inside the transformer. But while in operation if We measure the water content in oil as ppm parts per million unit.

Transformer oil testing – Wikipedia

If the resistivity of valuee insulating oil gets decreased, the value of tan-delta increases and vice verse. That means at which voltage dielectric strength of transformer oil between the electrodes has been broken down. Some of them are even battery-powered and come with accessories. Retrieved from ” https: Mohamed Hakeem Meerashahib February Amorphous metal transformer Austin transformer Autotransformer Buck—boost transformer Capacitor vqlue 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.


Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to transfrmer that it is still fit for purpose.

The acidity of transformer oil is measure of vallue acidic constituents of contaminants. 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 of India. The acidity of oil deteriorates the insulation property of paper insulation of winding. What’s the difference between power transformer and reactor? In addition to these, this oil serves other two purposes, it helps to preserve ttansformer 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 transdormer.

Check for similar questions. We’ll assume you’re ok with this, but you can opt-out if you wish. The specific resistance of oil is a measure of Transformed resistance between two opposite sides of one cm 3 block of oil.

Acid coupled with water further decompose the oil forming more acid and water. New York, NY [u. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. If oil becomes acidic, the water content in the oil becomes more soluble in the oil. Dielectric strength means the maximum capacity to withstand voltage of insulating oil.


This means that every time you visit this website you will need to enable or disable cookies again. In this kit, oil is kept in a pot in which one pair of electrodes are fixed with a gap of 2.

In transformer oil has mainly two purposes, first for insulation, second as cooling of Transformer core and other winding. Follow Upvote Report Question Comments 1. Physical Transformre of Transformer Oil Inter Facial Tension of Transformer Oil Interfacial vlue between the water and oil interface is the way to measure the attractive molecular force between water and oil.

Flashpoint is important because it specifies the chances of fire hazard in the transformer. Regular transforme and sampling of insulation Oil is very important in the maintenance progaram to prevent c Upvote 1 Downvote Reply 0 Report. More Questions Like This.

Dielectric Strength of Transformer Insulating Oil

This measurement is valhe 3 to 6 times in the same sample of oil, and we take the average value of these readings. Try adding a different answer. 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. Electric transformers Electrical tests.

Now transfromer rising voltage is applied between the electrodes. The transformer oil insulation oil of voltage- and current-transformers fulfills the purpose of insulating as well as cooling.