22.12.2020

Category: Transformer oil testing pdf

Transformer oil testing pdf

The performance characteristics of transformer insulating oil are monitored and tested at several stages during its service life. It is therefore, essential to the life of the transformer to periodically monitor the condition of the insulating oil.

The heart of the transformer is the solid insulation, but the insulating oil is the life blood of the transformer. Without the life blood, the heart will die. When new, transformer oil has a very light color and complies with performance standards that include dielectric strength and other important characteristics. Contaminated oil usually has a high ash content, increased acidity and presence of low molecular acids.

Servicing the oil before it becomes aggressive against the solid insulation is the key to extending the service life of your transformers. Dielectric strength is one of the most important indications of oil stability and this is often the first test performed. Six breakthroughs are achieved in the test and the last five are averaged.

If the oil is fresh, the lowest allowable breakthrough voltage is 30 kV. In some transformers, that meets the minimum operating standard.

Decreasing dielectric strength is caused by contamination of the oil by gas, moisture, cellulose fibers or other particulate matter. See more video about transformer oil purification. The color of transformer oil changes from light yellow to cloudy brown under the influence of temperature, contaminants and electric current.

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The presence of solid particles in the oil and the acid number of the oil are two related oil purity characteristics. The more particles that are present in the oil, the faster the oil ages. The acid number is expressed as milligrams of KOH required to neutralize all acids in a gram of oil and indicates the degree of oil aging.

A normal and acceptable acid number is 0. Moisture and gas content in transformer oil must be tested for thoroughly. Water and gases are very damaging to your transformer insulation system and are two main cause of the oxidation process and oil aging process. Moisture and water content is measured as amount of hydrogen when reacting the oil with calcium hydride in a certain period of time. Gas content is measured by an absorptiometric analyzer or a chromatographer. This website uses cookies to improve your experience.

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Transformer Oil Testing Methods Value. In this article, we will examine the value and benefits of each test.

transformer oil testing pdf

T ransformer oil colour is determined by means of transmitted light and given a numerical value based on comparison with a series of color standards. Noticeable darkening oil indicates either contamination or that arcing is taking place.

The dielectric breakdown voltage is measured by applying a voltage between two electrodes under the oil. Different gasses will dissolve in the oil that indicate various types of thermal and electrical stress occurring within the transformer.

An oil sample tube and syringe is used to draw, retain and transport the oil sample in the same condition as it is inside a transformer with all fault gases dissolved in it.

Transformer Oil BDV Test on site Training - Break Down Voltage Test - English

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transformer oil testing pdf

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Quality Assurance: Methods of Transformer Oil Testing

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