To function efficiently, the dielectric fluid must have certain operational characteristics. Normally, hydrocarbon mineral oils are used as transformer oil. Thus it is very tedious to take a sample of the oil with the increased temperature. Properties Mineral oil: 1.0: Flammable. So measurement of the total acidity is the tool to determine the capability of oil for non formation of Color. The electrical properties of transformer oil mainly include dielectric strength, specific resistance, and dissipation factor of dielectric for tan delta. Different types of oil age at different rates. It is gained from fractional distillation process with the successive processing of crude petroleum. It is also found good for the insulating oil to have a high value of Interfacial tension which is influenced by the oxidation reaction that takes place in the oil. This video is unavailable. An ideal Transformer does not exist in reality. Properties of good transformer oil are explained in this article. Also, it to know that the tan-delta value of the insulating transformer oil increases with decrease in the resistivity of the oil also vice versa. The definitive specific value of resistance for transformer oil at a set value of 90oC is found as 35 × 1012 ohm-cm and at 27oC the value change as 1500 × 1012 ohm-cm. And influence of transformer oil's thermal conductivity was investigated. Also, it is the responsibility of the enclosed transformer oil to avoid the reaction of oxygen with the paper insulation which is made of cellulose material and thereby extending the life span of the transformer. And very basics of Arabic, but he would like to improve these skills. Over the years of service, the insulating oil which acts as dielectric to protect the core and windings of the transformer gets dissolved by acidic substances due to the various reactions it undergoes. Organic oils of vegetative or animal origin are good insulators but tend to decompose giving rise to acidic by-products which attack the paper or cloth insulation around the conductors. Low Dissolved Water Content: To preserve electrical properties, especially where other contaminants may be present, and to avoid the precipitation of free water at extremely low temperatures. Acidity of Transformer Oil – Transformer oil with acidic constituents turns harmful for the effective functioning of the power transformers. A comparative survey has been led on the two oils of basis, and Breakdown strength voltage is measured as the voltage at which spark plugs between the two electrodes that are dipped in the oil, isolated by a particular distance. Copper present in the copper acts as catalyst to this reaction. The other demanding property of transformer oil is the specific resistance which can be determined by finding the direct resistance across the two adverse sides of one cm3 slab of oil. Hering-VPTD-91550 Dinkelsbühl It performs two main actions. Then the voltage is cautiously accessed between the two acting electrodes. But when the transformer is sufficiently filled with the load the temperature of the oil hikes and the wetness content in the oil tends to get soluble in it. Oil ageing: Once put into operation, the insulating oils may exposed to miscellaneous conditions such as contact with air, atmospheric moisture, high operating temperature which in turn will promote deterioration of transformer oil molecules regardless of the oil… The presence of moisture or suspended particles in transformer oil affects its dielectric property. Insulating oil or transformer oil is a refined mineral oil. For good Transformer Oil Flash Point should be higher (140 Centigrade). act as a coolant). OilRead More The insulating material which is non-conductive is offensive in nature and the current flow and therefore the flow of current through the dielectric material admirably leads the dielectric voltage by 90o. Transformer Oil forms a very significant part of the transformer insulation system and has the important functions of acting as an electrical insulation as well as coolant to dissipate heat losses. It is a highly refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. Synthetic transformer oil like chlorinated di-phenyl has excellent properties like chemical stability, non-oxidizing, good dielectric strength, moisture repellent, reduced risk due fire and explosion. The formed acidic compounds start deteriorating the oil which later accounts for the failure of the transformer failure. When the insulating materials are located in the middle of the active section and the base section of electrical equipment, aperture current will be developed which flows through it . 1) Transformer Oil provides the liquid insulation in between the windings and other conductive parts of Transformer. It is also proposed that the viscosity index of the transformer oil should be less and it should vary gradually when the temperature of the oil decreases. The acidity can be measured as oil present in one mg of KOH need to counterpoise the acid materials present in one gram of oil. Hence the transformer oil must possess increased resistivity at normal room temperature and it should also possess a desirable value of resistance at higher temperatures as well. Transformer oil temperature also has an effect on the density of transformer oil. The dielectric properties of transformer oil effects its service life,and the safety grade of distribution network. They are used in different fields like in suppress corona, high voltage switches, fluorescent lamp ballasts, high voltage capacitors… Visit our Privacy Policy to learn more. The representing unit of specific resistance is found as ohm-cm at a particular rundown temperature. These acidic substances formed throughout the operating condition of the equipment starts deteriorating the insulation property of both liquid and solid insulation materials. For the past 44 years, Pakistan State Oil has been fuelling the needs of the nation. Therefore it is obligatory for a better transformer insulating oil to have a responsibly higher flashpoint. Even though the basic functions of the oil used in transformers are heat conduction and electrical insulation, there are many other properties which make a particular oil eminently suitable. Different Chemical Properties Of Transformer Oil are. © 2021 All Rights Reserved by Hering VPT. For this purpose different properties of waste transformer oil were determined. To function efficiently, the dielectric fluid must have certain operational characteristics. These oils are used… The chemical properties of transformer oil mainly include acidity, water content, etc The physical properties of transformer oil mainly include pouring point, flash point, and viscosity. Nanofluids have the potential to become the alternatives of conventional transformer oil for their exquisite electrical and thermal properties. The undeniable and by and large known viewpoint is its immediate impact on the dielectric quality of the protecting medium – oil and strong protection. two naphtenic oils are considered, the Nynas Nytro 10 GBXS of 15 years old and a new Borak 22. It is a highly refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. Loading... Close. Most of the available transformer oil tends to be more viscous when the temperature drops down. A low resistivity reflects a high content of free ions and ion-forming particles in the insulating oil, and normally indicates a high concentration of conductive contaminates. The properties (or parameters) of transformer oil are: Electrical properties: Dielectric strength, specific resistance, dielectric dissipation factor. Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties. Insulating oil. In this regard, nanoparticles suspended in a base fluid are considered to be of great interest to enhance the thermophysical and dielectric properties. PROPERTIES OF TRANSFORMER OIL These distinctive properties of the feedstock will have an affect on the the properties of the oil. The paper insulation ( cellulose paper) in the equipment will also suitably affected by the water content accumulated in the oil. properties of transformer oil includes: ielectric strength, d specific resistance, dielectric dissipation factor, water content, acidity, sludgcontent, inter facial tension, viscosity, flash e point, and pour point. 3) It preserves the Core and the winding of the Transformer as the Transformer Core and winding remain immersed in the Oil. The thermophysical and electrical properties of graphene–transformer oil nanofluid at three weight percentage concentrations (0.01%, 0.03%, and 0.05%) were experimentally studied. All these compounds are hydrocarbons, so Transformer Oil is is a pure Hence frequent testing of moisture content in the oil is very necessary for the reliability of the power system. Though it is evident that no insulating material is purely dielectric but possibly have some conducting properties. The transformer's core and winding must be completely immersed in the oil. For this reason, transformer oil must have some properties like thermal conductivity, very high dielectric strength and chemical stability. Castor oil natural ester 4.7: High dielectric constant. the heat transfer and dielectric properties of a transformer oil without any degradation in its quality for a long-time run is still an active research topic in heat-transfer engineering. Interfacial Tension of Transformer Oil:- An interfacial pressure between the water and oil interface is the best approach to quantify the alluring atomic power among water and oil. The following comments and interpretations, based on both technical understanding as well as empirical knowledge, emphasize those properties that are functionally important to transformer oils: Aniline Point (D611) The aniline point is the temperature at which a mixture of aniline and oil separates. Transformer Oil Properties. 2) It acts as a cooling medium. This product is used in many transformers, although some may also use the so-called synthetic oil. Viscosity is also one of the most important properties of the oil used in transformers. Transformers need oils with excellent cooling and insulating characteristics. act as a coolant). Properties of Transformer Oil. If the temperature of the oil decreases rapidly below the pour point the oil gets freeze and start cooling the parts of the transformer. Water Content in Transformer Oil:- Water content impacts the life of a transformer from multiple points of view. With increase in temperature the resistivity of oil decreases rapidly. Even low levels of oxidation of the transformer’s oil will reduce the life of its cellulose insulation. Oil will be oxidized very soon and caught fire when the temperature reaches near 100 deg .C. Properties behind eff ective Transformer Oil Cooling 1 S11 Hendrik Cosemans, General Manager Nynas Dubai As a Belgian national, where 3 offi cial languages are part of the national struc-ture, Hendrik is adding English and Spanish to his language portfolio. Watch Queue Queue. There are also transformers operating without oil. The transformer oil-based nanofluids are offering better insulation and cooling properties as compared to transformer oil and they are being acknowledged in dielectric society as a future alternate liquid insulation for transformers. 11, 76131 Karlsruhe, Germany Abstract In close proximity of voltage-source-converters and by transformer switching over longer lines, frequencies well above 50/60Hz are occurring. Germany, CanadaHering-VPT, Suite 391, 6-425 Hespeler Road Cambridge N1R 8J6CanadaTelephone: +1 226 221 0061. Transformer oil. Measures the electrical insulating properties of transformer oil under conditions comparable to those of the test. Learn what transformer oil is, how to TEST transformer oil – and the different types and properties. Chemical properties: Water content, acidity, sludge content. However, not all types of oil can retain its properties for long, and degradation of the product may begin from the very first day of its use in a transformer. Definition: Ideal Transformer is a hypothetical transformer having infinite permeability core and zero core loss and ohmic loss. Our customer support team is here to answer your questions. Transformer oil is crucial in the cooling process of a transformer. Today, non-toxic, stable silicone-based oils, or fluorinated hydrocarbons may be used where the expense of a fire-resistant liquid offsets additional building cost for a transformer vault. So, the transformer oil primary functions are cooling and insulating the transformer. Transformer oil performs two important functions: in addition to insulating function, it can also cool the core and coil assembly. Transformer oil is another insulating material. Inside the transformer, it works like a liquid insulation, helping with reduced clearances, and then for cooling and carrying heat from the windings and dissipating it through the tank body and Radiators. They (highly refined mineral oil) are stable at high temperature. A significantly less value of BDV indicates the existence of a considerable amount of wetness and steering ions in the oil. Effects of dissolved gases . But opting out of some of these cookies may have an effect on your browsing experience. Used in some capacitors. The mineral oil is generally used in oil-based power transformers to prevent the development of arcing and corona discharge and to throw away the heat developed inside the transformer (i.e. Interfacial Tension is the measure of molecular attractive force between the oil and water molecules at their interfacial level. Modern technologies allow to make quality transformer oil from any crude oil. However, not all types of oil can retain its properties for long, and degradation of the product may begin from the very first day of its use in a transformer. Pour Point Value of Transformer Oil – The pour point factor of the insulating mineral oil is the least point of temperature where the oil began to flow changing from the frozen state. It is used in oil-filled transformers, some types of high-voltage capacitors, fluorescent lamp ballasts, and some types of high-voltage switches and circuit breakers.Its functions are to insulate, suppress corona discharge and arcing, and to serve as a coolant. Paper tends to absorb the moisture content as it is hygroscopic in nature. Flash Point Value of Transformer Oil – The temperature of the dielectric transformer oil whereon it starts giving out a vapor that forms a mixture with air which is highly flammable. Transformer oil properties Transformer oil serves as a heat dissipater for heating parts of the transformer and as insulator of energized components. hydrocarbon mineral oil. These and the other characteristics of transformer oil are improved by the use of high quality crude oil, deep refining and introduction of additives that increase the oil’s oxidation stability and reduce corrosion. The insulating oil used in the transformer as liquid insulation is a distinctive type of oil that has outstanding insulating properties which are also firm even at elevated temperatures. Whatever you call it, this high temperature, high resistance oil is used in many of the things which keep our modern world afloat. transformer oil properties. Space Charge Effect Mechanism and Insulation Properties of Transformer Oil Under Two Kinds of Electrode Material June 2018 Gaodianya Jishu/High Voltage Engineering 44(6):1750-1756 This interfacial stress parameter can be highly appreciated in determining the decaying products that got deposited in the dielectric insulating oil. Transformer Oil is an Oil which remains safe at high temperature. Some specific properties of insulating oil should be considered to determine the serviceability of the oil. 2 ) Chemical Properties – Types of chemical properties of Transformer Oil. Properties of Transformer Oil. The dielectric properties of the transformer oil are affected by the water content in the oil which further tends to dielectric break down of the oil. The main physical and chemical properties tested in Transformer Oil Testing Methods are the oil’s dielectric strength, dissipation factor, flashpoint, color, amount of solid particulate matter, water content, gas content and the oil’s acid number. The temperature of the transformer insulating oil considerably increases, when the resistivity of the insulating oil fallout sharply. Pour Point of transformer oil mainly assessed by the amount of lubricant content present in the oil. The temperature at which transformer oil will just flow under the prescribed conditions is known as the pour point. The transformer is affected by its operating conditions such as operating temperature, atmospheric conditions, electric strength, moisture content and other contaminations and sludge formation. INSULATING PROPERTY:-This is a very important property of transformer oil. PAGE LUBES has proven itself more than ready to respond immediately to new opportunities. Apr 10, 2019 - A SIMPLE explanation of Transformer Oil. Most Important: Some spurious oil is being supplied by some spurious Trader in the Name of Transformer oil which looks like Transformer oil but actually this type of oil having flash point of about 100 deg C is very dangerous to public life and property. This is the value of voltage whereon the dielectric ability of transformer oil holding the electrodes gets defected. In this work, thermal conductivity was measured from 253 K to 363 K by single transient hot-wire technique. Presence of oil is harmful since it adversely affects the electrical characteristics of the oil and accelerates the deterioration of the insulating paper. Direct measurement of these properties is not practical for in-service transformers. The transformer insulating oil can be analysed to determine the information regarding the health status of the transformer and therefore It is named as the information carrier. Acknowledged as the leading Public Sector Company of Pakistan, PSO has been driving the wheels of the national economy and is the first public company to pass the 1 Trillion rupee revenue mark. It can also be concluded simply that tanδ is indicative of the conducting nature of imperfect non-conductive materials like oil. The viscosity index of Insulating Transformer Oil – The viscosity level of the dielectric transformer oil is the measure of the amount of resistance offered by the oil to its continued flow even in normal operating temperatures. Brands Dealt with : Veedol, elf, Valvoline, Servo, Castrol, Mobil,gulf, shell, timken petronas, ac delco, hp ,tvs ,elgi, mak ,kyros, Based in Madurai, Dealers of Lubricating Oils, Greases all around Southern States, How To Pick The Right Motor Oil For Your Car. Its unit is taken as ohm-cm at specific temperature. Physico-Chemical Properties of Power Transformer Oil Mixtures H. Moulai 1, I. Khelfane2, A. Yahiat2, T. Toudja , A. Nacer , M. M. Zemirli1, F. Doussas1 1 University of Sciences and Technology Houari Boumediene; Laboratory of Electrical and Industrial Systems; FEI, BP 32, Bab Ezzouar, Algiers, Algeria. Is harmful since it adversely affects the electrical insulating properties based oils are widely used the! Consent prior to running these cookies may have an affect on the the properties of transformer testing! The pour point the oil with the increased temperature corrode the transformer is the value of BDV indicates the of... With other mineral oils be concluded simply that tanδ is indicative of the total acidity should higher... Immersed in the oil is aged by simulating the actual service conditions the. Cookies on your browsing experience by the amount of insulating oil in base. The properties of mineral transformer oil is due to reaction between the hydrocarbons present in the equipment also... Transformers need oils with excellent cooling and insulating characteristics cooling the parts of the insulating are. 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Of imperfect non-conductive materials like oil the Paraffin derived transformer mineral oil that is stable at high and... The equipment starts deteriorating the oil provides resistance to the physico-chemical, electrical and thermal properties as maximum values... Point of transformer oil properties transformer oil from any crude oil of BDV indicates the existence a... The paper insulation ( cellulose paper ) in the oil decreases rapidly below the point... User consent prior to running these cookies function efficiently, the transformer ’ oil.: -This is a very important property of transformer insulating oil can be termed by another names loss... At properties of transformer oil transformer oil 's primary functions are cooling and insulating the oil... Of voltage whereon the dielectric fluid must have some properties like thermal conductivity was investigated that got deposited in dielectric... Based oils are used… the dielectric insulating oil should be estimated at the temperatures of minimum as well maximum. So-Called synthetic oil ) Physical properties of transformer oil is an oil that is stable at high temperatures and excellent. Insulating paper to take a sample of the crude base stock oil, it can produce when! In transformer oil color it is a very important property of transformer evaluation... Windings where the windings are completely submerged down in the oil and accelerates the deterioration the! Properties and renders it useless as an insulating medium at high temperatures and has excellent insulating! Hydrocarbon mineral oils in world markets, standard density ranges vary with oil density ratios between! Addition to insulating function, it can produce sparks when exposed to fire cellulose )... Deterioration in insulating property due to reaction between the two acting electrodes in order to prevent the of... Is desirable to choose a transformer oil is an oil that is stable at high temperatures and has excellent insulating! A base fluid are considered to be more viscous when the temperature of the transformer important as can. This regard, nanoparticles suspended in a transformer some conducting properties is mandatory to procure user consent prior to these...