Transformer Oil definition of Transformer Oil in the Free Online Encyclopedia.

transformer oil [tranz′fȯr·mər ‚ȯil]

(materials)

A high-quality insulating oil in which windings of large power transformers are sometimes immersed to provide high dielectric strength, high insulation resistance, high flash point, freedom from moisture, and freedom from oxidization.

Transformer Oil

a petroleum or synthetic oil used as an insulator and coolant in transformers and other oil-filled electrical equipment. Petroleum transformer oils are also used in oil circuit breakers for extinguishing an electric arc when the current is switched off.

Most transformer oils are petroleum oils. They are obtained by refining the appropriate petroleum distillates with the aid of selective solvents (phenol or furfural), sulfuric acid, or adsorbents or by hydrogenation. The process of extracting oils from raw material containing paraffin hydrocarbons includes a dewaxing stage.

Transformer oils should have a high dielectric strength, a high

Figure 1. Impedance transformers: (a) coaxial and (b) wave-guide quarter-wave types with fixed resistance, (c) adjustable coaxial double-stub, (d) adjustable coaxial with dielectric bushings, (e) wave-guide type with double tee junction; (1) and (2) adjustable plungers, (3) and (4) movable dielectric bushings, (5) H-arm, (6) transformer input, (7) E-arm, (8) transformer output, (D) diameter of outer conductor of coaxial line, (d₁), (d₂), and (d) diameters of inner conductor of coaxial line from the generator side, from the load side, and in the transformer portion, respectively, (b₁), (b₂), and (b) dimensions of smaller side of cross section of rectangular wave guide from the generator side, from the load side, and in the transformer portion, respectively, (l) distance between centers of the dielectric bushings, (λ) effective wavelength in the line, (ε) dielectric constant. Dotted rectangles denote the location of movable plungers in the E- and H-arms of the tee junction.

resistivity, a small tangent of the dielectric loss angle, good resistance to oxidation, low viscosity, and low volatility. Petroleum transformer oils have a viscosity of 6–10 × 10^–6 m²/sec at 50°C, a pour point not higher than –45°C, a flash point not lower than 135°C, a tangent of the dielectric loss angle not greater than 0.026–0.005 at 90°C, and a dielectric constant of 2.2–2.3; they should not contain water or any impurities. All grades of transformer oils produced in the USSR contain not less than 0.2 percent antioxidant additives, such as Ionol (2,6-di-tert-butyl-4-methylphenol).

The most widely used synthetic transformer oils are liquids based on chlorinated biphenyls and trichlorobenzene, for example, Geksol and Sovtols. Hydrocarbon, organosilicon, and organophosphorus synthetic oils are also used in certain types of special transformers.

REFERENCES

Lipshtein, R. A., and M. I. Shakhnovich. Transformatornoe maslo, 2nd ed. Moscow, 1968.
Tovarnye nefteprodukty, ikh svoistva i primenenie. Edited by N. G. Puchkov. Moscow, 1971.
Shakhnovich, M. I. Sinteticheskie zhidkosti dlia elektricheskikh apparatov. Moscow, 1972.

E. E. DOVGOPOLYI

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No references found	These brands specialise in the fields of relays and systems, testing, measuring, and calibration equipment, process instruments, power quality, cables, transformer oil, filtration and regeneration services and related accessories. Bin Hindi introduces new technology by Gulf Industry The fire broke out on June 12 in a 132 kilovolt transformer supplying the works and spread to 8,800 gallons of transformer oil. Back on track; JUST FIVE MONTHS AFTER THIS FIRE METAL PLANT IS.. by Daily Post (Liverpool, England) Cardinal transformer oil circulating pumps, of glandless design to prevent leaks, are rated for continuous operation from -40°F to 100°C, with capability of thermó-siphon flow to allow natural convection even with the pump completely shut off. Product briefs by Anonymous / Electrical Apparatus	transflective LCD transfluxor transform transform fault Transformation transformation constant transformation group transformation matrix transformation methods Transformation of Quantitative Into Qualitative Changes transformation of similitude transformation series Transformation Temperature transformation theory transformation twin transformation-temperature ranges Transformational Grammar transformational-generative grammar Transformer transformer bank transformer bridge transformer coupling transformer hybrid transformer load loss transformer loss Transformer Oil transformer read-only store transformer rectifier transformer room Transformer Substation Transformer Transducer transformer vault transformer voltage ratio Transformer with Load Tap Changing Transformer, Current Transformer, Impedance Transformer, Power Transformer, Voltage transformer-coupled amplifier transforming principle transforming section Transformism transfusion transgene transgenic transgenic organism transgranular Transgression transgressive deposit transgressive overlap Transhumance	Transformed Dreams Transformed Dreams Transformed Hamster Embryonic Lung Cells Transformed Least Squares Transformed Least Squares Estimate Transformed Neonatal Rat Retinal Pigment Epithelial Transformed Normalized Difference Vegetation Index Transformed Rabbit Corneal Epithelial Cells Transformed Rat Kidney Epithelial Transformed Spectral Index of the External Standard Transformed Tile Iteration Space Transformée de Fourier Discrète Transformée de Fourier Rapide transformer transformer transformer transformer transformer bank transformer bridge Transformer Characteristic Resistance Transformer Coupled Plasma transformer coupling transformer fluid transformer fluid transformer fluid Transformer Harmonic Derating Factor transformer hybrid transformer load loss transformer loss Transformer Maintenance and Service Transformer Oil Transformer Oil and Gas Analyzer Transformer Oil Regeneration System Transformer Pad Transformer Read Only Storage transformer read-only store Transformer Rectifier Transformer Rectifier Transformer Rectifier Unit Transformer Room Transformer Room Transformer steel transformer substation Transformer Transducer Transformer Turns Ratio Transformer Utilization Factor transformer vault transformer voltage ratio Transformer Windings Transformer with Load Tap Changing Transformer, Current Transformer, Impedance Transformer, Power Transformer, Voltage transformer-coupled amplifier Transformer-Energized Megawatt Pulsed Output Transformer-Limited Fault

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These brands specialise in the fields of relays and systems, testing, measuring, and calibration equipment, process instruments, power quality, cables, transformer oil, filtration and regeneration services and related accessories.

Bin Hindi introduces new technology by Gulf Industry

The fire broke out on June 12 in a 132 kilovolt transformer supplying the works and spread to 8,800 gallons of transformer oil.

Back on track; JUST FIVE MONTHS AFTER THIS FIRE METAL PLANT IS.. by Daily Post (Liverpool, England)

Cardinal transformer oil circulating pumps, of glandless design to prevent leaks, are rated for continuous operation from -40°F to 100°C, with capability of thermó-siphon flow to allow natural convection even with the pump completely shut off.

Product briefs by Anonymous / Electrical Apparatus

transformation constant

transformation group

transformation matrix

transformation methods

Transformation of Quantitative Into Qualitative Changes

transformation of similitude