Basic Physical and Chemical Properties of Insulating Oil. From the standpoint of high dielectric strength, it is desirable to have a higher viscosity oil. Appearance: – The color of the oil must be clear and transparent. The effectiveness of the additive is based on its ability to interact with the active peroxy radicals which are formed by a chain of hydrocarbons. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful. Testing sequences and procedures are defined by various international standards, many of them set by ASTM. With increasing temperature, density of oil decreases. As the temperature increases, the density of the oil decreases. After the anti-oxidation additives have become depleted over time and through extended use, the oil will oxidize at a rate close to the rate of oxidation in an “uninhibited” base oil. The density of transformer oil is usually in the range of (0.84-0.89) × 103 kg/m3. There are several properties of transformer oils. Super grades. TRANSFORMER OIL PURCHASE SPECIFICATIONS (Developed Under the Auspices of the Doble Oil Committee) March, 2017 COMPOSITION This specifications covers new insulating oil for general applications for liquid-filled electrical equipment, which are manufactured from mineral crude, which may be either naphthenic, which has a very low naturally occurring n-paraffin (wax) content, or paraffinic, … The density of the heavy oil in the Shanjiasi field is up to 0.9719 g/cm 3.The dynamic viscosity of this heavy oil reaches hundreds of thousands of millipascal-seconds at 50°C. Operating oil is allowed a number of deviations from the curing temperature depending on whether the oil is used in a transformer or a switch, and whether it or operates indoors or outdoors. A good number of these properties are experimented upon by using the breakdown Also, it should be free from any suspended matters. Localised grades. Insulating Oils or Transformer Oils are mineral electrical insulating oils processed from fractional distillation and treatment of crude petroleum. These distinctive properties of the feedstock will have an affect on the the properties of the oil. As the temperature expands, the density of the oil diminishes. The low temperature pour point indicates the oil’s ability to flow in extreme cold. Transformer Oil will be obtained by fractional distillation and subsequent treatment of crude oil. Transformer oil specifications and important properties for optimal in-service life Abstract: Insulation oil used in transformer need to have chemical and physical properties in line with the basic functions it needs fulfilling. Extreme low temperature pour point (-45°C -49°F and below) is also an important quality found in the better brands of insulating oil. Transformer Insulating Oil Characteristics. Large oil-filled power transformers use windings wrapped with insulating paper, which is impregnated with oil during assembly of the transformer. As the name suggests, the oil sample is compared with a previous sample from the same transformer and is checked for darkening of oil. These have a pronounced affect on the function of the oil. Rates of breakdown voltage (BDV), depending on the operating voltage of the equipment, must be equal (kV). 45#transformer Oil , Find Complete Details about 45#transformer Oil,Transformer Oil Name,Transformer Oil Density,Transformer Oil Msds from Lubricant Supplier or … 7. 2 Table 1: Mineral-Oil Based Transformer Oil Constituents Viscosity is also one of the most important properties of the oil used in transformers. 8. The density of the oil is assumed to be 0.864 kg/L. ensures that the temperature (of the oil) must fall to -20oC before the density of the oil would exceed that of ice'. We have considered the eleven most common ones. Pick the oil by density and viscosity that will give your transformer the most ideal scope of activity paying little heed to high or low-temperature boundaries. Density of transformer oil depends on the manufacturer. 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. Higher viscosity may mean better dielectric strength, but may reduce the ability of the oil to transfer heat and cool the transformer. The oxidation chains are broken by the presence of the oxidation inhibitor additives. 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. This means that every time you visit this website you will need to enable or disable cookies again. Special grades. Why don't libraries smell like bookstores? If the oil is heated, its specific weight decreases, and … 2 . Today, many transformers use “Inhibited Oils.”  An inhibited oil contains anti-oxidant additives that help to slow and inhibit the oxidation process. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. These transformer oil density are comprised of automated technologies that offer precise analysis and details on the outcome of a test phase. Oil has many uses; it heats homes and businesses and fuels trucks, ships, and some cars.A small amount of electricity is produced by diesel, but it is more polluting and more expensive than natural gas.It is often used as a backup fuel for peaking power plants in case the supply of natural gas is interrupted or as the main fuel for small electrical generators. Beneficial effects of the additives  The more effective the anti-oxidant additive is, the longer the oxidation induction period in the oil will be. The all important “Dielectric Strength” of transformer oil will be greatly reduced by the presence of fibers, water, and other contaminates found in the oil. source- Transformer Oil Density and Viscosity - ! TEST PARAMETERS TEST METHOD SPECIFICATION Min. High grades. Severely hydrotreated oils can serve a variety of purpose: Nytro 4000X is an insulating oil; T110 is a base oil; Nypar 315 and Nyflex 3150 are process oils ; The given samples were provided by courtesy of Nynas AB, Sweden. 1. A representative sample of the oil shall be examined in 100 mm thick layer at 27°C The oil shall be clear and transparent & free from suspended matter or sediment Transparent, clear and light: Density @ 29.5°C: IS : 1448 (P-16)-0.89: 0.840 g/cm 3: Kinematic Viscosity @ 27°C, cSt: IS : 1448 (P-25)-27: 12.4 cSt Transformer oils primary insulate and cools transformers, but can also be found in other electrical equipment, such as high voltage switches and circuit breakers. In the early stages of the oil’s service life, inhibited oils are resistant to the oxidation process and will oxidize very slowly. Antioxidant additives ( ionol ) 0.2-0.5 %. Fresh oil should solidify at a temperature no greater than a pour point temperature of -45°C/-49°F. Insulating oils play an important role in power supply. Naphthyl or cycloparaffins 60-70 % Transformer oil comes from purified crude oil and is obtained though distillation (boiling at between +300°C/+572°F and 400°C/752°F). to Transformer oils (insulating oils) to Properties of fluids. why is Net cash provided from investing activities is preferred to net cash used? fraction) is acceptable. From the standpoint of high dielectric strength, it is desirable to have a higher viscosity oil. Description. We'll assume you're ok with this, but you can opt-out if you wish. This website uses cookies to improve your experience. What was the weather in Pretoria on 14 February 2013? Severely hydrotreated oils can serve as base oils, insulating (transformer) oils, or process oils. This is because it tends to deteriorate over time. All Rights Reserved. Transformer oil temperature also has an effect on the density of transformer oil. In order to perform additional tasks in transformers  (such as heat transfer and cooling) and switches, the oil must have a lower viscosity. Transformer oils must be able to remain stable at high temperatures for long periods of times. insulation, dielectric, and oil‐related faults. Immediately after pouring the oil into the transformer, allowable values for breakdown voltage is 5kV lower than before oil filling. Get info of suppliers, manufacturers, exporters, traders of Transformer Oil for buying in India. Density of Transformer Oil at 29.5oC is 0.89g/cm3. Optimal kinetic viscosity of the oil at 20 ̊C is about 28-30×10-6 m2/second. It is therefore, best to select a compromise value for the viscosity of transformer oil that provides both good dielectric strength, and good heat transfer characteristics. Transformer oil density is defined as the ratio of the mass of the substance to the volume of the substance. 1.2 Scope. Paraffins 10-15 % Arctic grade oils are not recommended for use in non-Arctic climates where high heat is an operating factor. Box 10700 S-121 29 STOCKHOLM Sweden E-mail address: [email protected] Telephone No: +46-8-602 1200 Fax: … If the insulating fluid specific gravity is less than 1, sample from the bottom. The Dielectric properties of oils are mainly determined by the dielectric loss tangent. Kinematic viscosity for most oils at +20°C/+68°F is 28-30 × 10-6 m2 / s . Hence the name “inhibited oil.”  The most common anti-oxidant additive used to inhibit oil is Ditertiary butilparakrezolom (DBPC-2.6).