What is IFT in transformer oil?

This property is called the interfacial tension (IFT) and it is very sensitive to impurities in either liquid. As transformer oil degrades over time or as contaminants are introduced, the IFT between it and pure water will drop, thus indicating deteriorating health of the transformer.

What is the grade of transformer oil?

Transformer oils

Which oil is best for transformer?

Naphthenic mineral oil has long been the most preferred insulating liquid for power transformer insulation because it has a good pouring point at low temperatures, good thermal cooling capacity, low cost, high efficiency and availability on the transformers market [1, 2, 3, 7].

What is interfacial tension test?

Interfacial tension measurement between two immiscible liquids is based on the pendant drop method where a drop of liquid is formed at the end of the needle tip. Most typically the measurement is done between water-based and oil-based liquids, out of which oil is typically less transparent.

How is transformer oil manufactured?

The basic process for the manufacture of transformer oil consists of processing of Group II + base oils or equivalent mixed with special type of additives. Mineral Base oil at 650C is first dehydrated filtered through specially designed filters.

What is TTR testing?

Transformer Turns Ratio (TTR) testing is one of the most common ways of assessing the condition of a transformer’s windings and core. Throughout the life of a transformer, TTR results are compared against the nameplate ratings to reveal insulation deterioration, shorted turns, core heating or other abnormalities.

How do you calculate IFT?

Two complementary techniques are currently used at SINTEF Petroleum Research for measurement of IFT at high-pressure/high-temperature (HPHT) conditions. High to moderately low IFTs are measured by a drop shape method whereas moderately low to ultralow IFTs are measured by a light scattering method.

What is the IFT test for a transformer?

The IFT test is a powerful tool for determining how an insulating oil has performed and how much life is left in the oil before maintenance is required to prevent sludge. The IFT provided an excellent back up test for the NN.

Which is the best transformer oil analyzer on the market?

This is made easier with the Attension Sigma 702ET Transformer Oil Analyzer, the only tensiometer on the market dedicated to the quality control of transformer oils. In September 2018, a new transformer quality control standard based on IFT measurements was released, IEC 62961 [5], and it will likely replace the previous ASTM standard.

What is the dissipation test on a transformer?

Test Method: IEC 247. The Dissipation test measures the leakage current through an oil, which is the measure of the contamination or deterioration i.e. Reveals the presence of moisture resin, varnishes or other products of oxidation oil or of foreign contaminants such as motor oil or fuel oil.

What kind of test package do I need for my transformer?

Test Packages Our oil test packages target every condition for every type of transformer. Fluid test packages are offered for both mineral-oil-filled and alternative-fluid-filled transformers including askarel, natural and synthetic esters, silicone and Wecosol. Mineral Oil Filled Equipment