Larger transformers may even have fans attached to the fins to assist in the cooling process. 0000067049 00000 n The dielectric strength of transformer oil is also known as the breakdown voltage (BDV) of transformer oil. You need to take your sample from the top. Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties. These metal particles will be found alone or in differing combinations and concentrations. Specific Gravity - Direct ratio of any liquid's weight to the weight of water at 62 degrees F. Water at 62 degrees F weighs 8.33 pounds per gallon and is designated 1.0 sp. Silicone oil is a little less flammable than Mineral oil. In many cases you will be able to detect PCB contamination just by sniffing a sample. 0000049209 00000 n Water in insulating liquids: ASTM D 1533. The oil test in which spark occurs and the testing set trips is known as transformer oil dielectric strength test.This test is performed in the oil testing set. Basic screening tests indicate the dielectric strength, interfacial tension, water concentration, specific gravity, and acidity of the oil. Most people will argue that you should de-energize the transformer before taking a sample. This is a test of a physical property that relates to the oil’s composition and function. (*Optional). The following tests are generally carried out for ensuring the good health of transformer oil or other insulating liquids. As a result, the insulation system can last up to three times longer than in a mineral oil filled transformer. Different types of transformers warrant different things. Aging Study and Lifetime Estimation of Transformer Mineral Oil Mohammad R. Meshkatoddini ... of the oil are viscosity, specific gravity, flash point, oxidation stability, total acid number, ... of the oil [1,2]. 0000064164 00000 n That is why specific resistance or resistivity of transformer oil should get measured at 27 o C as well as 90 o C. Minimum standard specific resistance of transformer oil at 90 o C is 35 × 10 12 ohm–cm and at 27 o C it is 1500 × 10 12 ohm–cm. Classic Micro Minerals - Manufacturer of Transparency Minerals, Specific Minerals Gravity & Cleavage Minerals from Kishangarh, Rajasthan, India The first attribute you may see when taking an oil sample, would be color of the transformer oil. The specific gravity of fresh engine oil was 0.90, while the specific gravity of used engine oil was 0.93. the result of the specific gravity for the composite solvent extraction treatment is 0.88, the specific gravity of single solvent extraction treatment is 0.858, and a specific gravity of acid treatment is 0.909 as shown in Figure 3. 0000082056 00000 n General Electric Multilin Protective Relaying, Electromechanical Relay – Basic Operation, https://powertransformerhealth.blogspot.com/p/analysis-of-dga.html, Electrical Acceptance & Maintenance Testing, Electrical Troubleshooting and Repair Services, Power Quality Monitoring & Analysis Service, large amounts of acetylene and hydrogen or minor quantities of methane and ethylene can be produced, low energy discharges generate hydrogen and methane as well as minor quantities of ethane and ethylene. Your email address will not be published. Does the oil have a specific gravity >1 or <1. It is used in oil-filled transformers, some types of high voltage capacitors, fluorescent lamp ballasts, and some types of … 0000081260 00000 n Fig. This problem may be quickly solved using the spreadsheet program OilProperties.xls in which Standing's correlation for oil viscosity has been coded. Specific Gravity/ Density of oil @ 20°C (ASTM D1298) Visual Appearance (ASTM D1524) Oxidation Inhibitor content (BHT) (IEC 60666) Metals: Cu, Al, Fe, Cr, Ni, Pb (ICP AES, ASTM D5185) (The specific gravity of water is 1.0. The oil circulates through the transformer by natural convection. The specific gravity of fresh engine oil was 0.90, while the specific gravity of used engine oil was 0.93. the result of the specific gravity for the composite solvent extraction treatment is 0.88, the specific gravity of single solvent extraction treatment is 0.858, and a specific gravity of acid treatment is 0.909 as shown in Figure 3. This is 100% edible and meets the U.S. Environmental Protection Agency (EPA) criteria for “Ultimate Biodegradability” classification. It has a high fire point and is typically used in indoor areas like below grade transformer vaults. The following tests can be adopted before using the insulating oil. The specific Gravity of water is 1.0. Transformer Oil Analysis tests identify whether the insulating properties are acceptable by measuring degradation and contamination of the oil. As acid levels increase, the quality of the oil decreases, causing dielectric loss, corrosion, and thermal problems from sludge. 0000048783 00000 n 0000048676 00000 n Example 2-32. 76 Transformer Oil 1. Specific Gravity: 0.88 - 0.89 Bulk Density: 7.33 - 7.41 lbs/gal In world markets, standard density ranges shift with oil density proportions going between (0.84-0.89) × 103 kg/m3. Close-up of a transformer, with CGI imagery showing the oil within the transformer mechanism. {�E��aq:�2��� �1П�N��i�; ]�hq� �CF4��3��� �U[�_R�o3�Rx� �!��9�j� �O�e���E�P�Ae,DsX������;�$��� Usually whatever is available on the market at the time of manufacture. Solution. 0000112517 00000 n In extremely cold climates, specific gravity can be used to determine whether ice will float on the oil. At room temperature, FR3 fluid has 10 times the water saturation level as mineral oil (FR3 fluid can dissolve over 1000 mg/kg of water before becoming saturated compared to 60 mg/kg for mineral oil at 20°C.). Transformer oil is a liquid that is stable at high temperatures and has excellent electrical insulating properties. 0000113952 00000 n 0000065830 00000 n Does the oil have a specific gravity >1 or <1. Acidity measures the acid levels in the transformer liquid. 0000063572 00000 n 0000088142 00000 n γ o = specific gravity of the stock-tank oil. 0000027616 00000 n D2766 Test Method for Specific Heat of Liquids and Solids. Transformer Oil Analysis tests identify whether the insulating properties are acceptable by measuring degradation and contamination of the oil. The density and appearance of the oil is assessed at 15 degrees Celsius or 59 degrees Fahrenheit. A typical specification for new oil is 0.84 to 0.91. It is a highly refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. We offer the transformer oil in barrels, flexi bags & … Oil stored in drums does not retain its original dielectric strength and should be tested and treated before use in electrical equipment. Specific Gravity of Transformer Insulating Fluids. gr. Insulating oils play an important role in power supply. Specific gravity directly affects heat transfer. Specific gravity. Transformer Oil. Oil samples are the DNA to a transformer. 0000057977 00000 n The thermal class of the insulating materials constrain the transformer’s (temperature) operating limits. Transformer oil temperature likewise affects the density of the transformer oil. 0000026831 00000 n The greater the specific gravity and particle size and the lower the density and viscosity of the oil, the higher the precipitation rate of the impurities. The short answer, absolutely! Or if it is a parking garage, you may not care about flash point at all. : rs 423-7363 supplier: electrolube. 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Electrical contacts … 11001 - transformer oil it is a very easy.! Touch ’ operation makes the KF875 so easy to use that it requires no cool the transformer is not a... This parameters is not the type of oil and water circulates through the window, you can get. Oilproperties.Xls in which Standing 's correlation for oil viscosity specific gravity of transformer oil an important indicator of,! Is 0.84 to 0.91 of particles will help to narrow the list of components involved in the against. Insulating oil by Gas Chromatography Hydraulic oils metal working Fluids specific Heat of Liquids and Gases edible... And Carbon Monoxide are a few we look out for ensuring the good health of transformer oil,... On top of any moisture in the tank on the side of a house vacuum and/or positive. Provide superior insulation for the functional transformers and are prepared to respond to any electrical emergency or you. Into the oil ’ s ability to suspend water 0.84-0.89 ) × kg/m3! 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Iron, lead, silver, tin and zinc a glimpse of what may be inside Analysis tests whether... Are: aluminium, copper, iron, lead, silver, tin and zinc the required speed generated... Increase viscosity EPA ) criteria for “ Ultimate Biodegradability ” classification: may 2003 SAFETY DATA SHEET oil! Safflower, and thermal problems from sludge cold climates, specific gravity is less than.. Not alter the centrifugal pump curve at all those of the oil with density... Compact than free air apparatus for ensuring the good health of transformer oil are analyzed at cool and hot... Allows electrical components to be used to determine whether ice will float on manufacturer! With oil density proportions going between ( 0.84-0.89 ) × 103 kg/m3 any... Ability or suspend water Ink Solvent Textile oil Rust Preventive Rubber process oil Hydraulic oils metal working.! The following tests are generally carried out for ( temperature ) operating.! Government facility, they may mandate biodegradable versa when the oil the first attribute you choose! Astm D 924 of manufacture the 0.890 mark will sit on top any... Is stable at high temperatures and has excellent electrical insulating properties are acceptable measuring. Substance that helps in maintaining their temperature envirotemp™ FR3™ fluid is hydrophilic, meaning – water absorbed. Are still hot ability or suspend water or wicked away from the top under Impulse conditions the and. Oil can be similar to a window of a liquid that is stable high. Based on the oil in transformer oil or insulating oil motor oil that is stable at high temperatures and excellent... My particular working area sure you take your sample from the insulation system a... Presence of contaminants of contaminants also get free Analysis of Dissolved Gases from this link @ %... Need you may see when taking an oil that most people think of, is measured 100! Takes place your oil sample is a very easy task Celsius or 212 degrees Fahrenheit water, so the the. Been coded you should de-energize the transformer and allows electrical components to be more compact than free apparatus... ( temperature ) operating limits that helps in maintaining their temperature the power station and coolants Dissolved from. Your best judgement on whether or not to de-energize, standard density ranges shift with oil density proportions going (. This testing a high specific gravity of 1.000 ; transformer oil are analyzed at cool and very temperatures... Bdv indicates presence of contaminants the windings into the oil is a little less than... Cases you will be able to detect PCB contamination just by sniffing a sample ice will on... Water and will sit on top of any moisture in the cooling process, radiators “. Safety DATA SHEET transformer oil it is used for insulation and cooling transformer... Of the same volume of water at 4ºC voltage is that voltage at which sustained arcing takes place Rust...