transformer oil viscosity chart

Published by on November 13, 2020

The density of transformer oil is one of the most important aspects of its physical characteristics. Dielectric dissipation factor is also known as loss factor or tan delta of transformer oil. Reference Object 1 to 5cSt. IT'S LIQUID ENGINEERING. Again it is clear from the above diagram, the value of ′δ′ which is also known as loss angle. ASTM D2502 depicts how to get the mean atomic weight from thickness estimations at 37.78 °C and 98.89 °C (100 °F and 210 °F). Sae-10 motor oil 350cSt. The gassing rate will vary based on the loading, insulation material, and transformer design. More plainly, the leakage current through insulation does have two component one capacitive or reactive, and another one is resistive or active. If you accept cookies from external media, accessing these contents no longer requires giving manual consent. Viscosity cSt. The transformer oil’s cooling ability affects the basic premises for the design and function of the transformer. It was important for us to make sure the transformer was running as cool as possible, so we wanted an oil with low viscosity, also something with no sulphur, so it was important for us that we had good technical support from both the transformer manufacturer and the oil supplier. Owned and operated by AZoNetwork, © 2000-2020. The Viscosity-Gravity Constant (VGC) is calculated following ASTM D2501. This measurement is taken 3 to 6 times in the same sample of oil, and we take the average value of these readings. During oxidation, acids get formed in the oil the acids give rise to the solubility of water in the oil. Moisture or water content in transformer oil is highly undesirable as it affects the dielectric properties of the oil adversely. The viscosity of an oil is measured by its resistance to flow. So both resistivity test and tan delta test of transformer oil are generally not required for the same piece of the insulator or insulating oil. for the shopping cart), others help us make our online content better and easier for you over the long term via analysis, external media, and marketing services. Oils with particular carbon compose dispersion are intended for different businesses. Interfacial tension between the water and oil interface is the way to measure the attractive molecular force between water and oil. If the oil temperature falls below the pour point, transformer oil stops convection flowing and obstruct cooling in a transformer. Large amounts of hydrogen or acetylene or minor quantities of ethylene and methane can be produced. Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties. Density is another major parameter, as possible ice bodies floating on top of the oil cause a safety hazard. Physical properties: Interfacial tension, viscosity, flash point, pour point. The amount of dissolved gas in transformer oil can be found using a dissolved gas analysis (DGA) test. This measurement is related to how an oil flows when it is cold, such as at engine start-up. We collect and combine data on our visitors and their behavior on our website. Viscosity is a parameter that affects heat transfer as oil naturally circulates in small transformers and as it circulates by pumping in large transformers. So it is desirable to have a very high flash point of transformer oil. If the results from the test are showing some red flags, the frequency will have to increase. Acidic transformer oil is a harmful property. Traces of acetylene might be created if the unit has electrical contacts or if the problem is severe. Acidity accelerates the oxidation process in the oil.

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