(13.8. / )

:- 50. 100 . 200 . . ( ) (onan ).O.N.A.N oil natural air natural O.N.A.F oil natural air forced O.F.A.N oil forced air natural

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Indication

Transformer oil classifications

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J. Conservatork. Oil gaugel. Dehydrating Breathersm. Silica geln. Control panelo. Oil tankp. Transformer oil Cooling fanPrimary winding RadiatorSecondary windingHigh voltageLow voltageBuchholz relayFloat

Radiators are used to provide cooling of the oil Cooling is by convection Fans are mounted on the transformer radiators to provide a forced air that will increase cooling of the oil transformer can be loaded 20-30% over the one used without with out cooling fans

the core gives up its heat to the oil and the oil in turn gives up the heat to the metal of the radiators by conduction . The heat is given off from the radiator to the surrounding air

It is designed to give a signal when the transformer develops internal trouble Buchholz relay is actuated by the buoyancy of the gas produced in the transformer or the rushing current of the oil It is possible to determine the cause of trouble by checking the quality and color of the gas and quantity

the first protection for transformer oil the connecting pipe between the conservator and main tank is of a small diameter inhibiting interchange of oil between them The tank is completely filled with oil

They are designed to relieve high pressures and in doing The simplest form of pressure relief vent is the rupturing diaphragm type is designed to rupture at a predetermined pressure

All power transformers are equipped with an oil level gauge

These operate on a simple float principle and may provide visual indications only or may be equipped with alarm contacts to indicate high or low level conditions

For use on all sealed type power transformers Direct reading and indicate the pressure or vacuum on the tank

A thermometer is located near the top of the top oil The thermometer is usually equipped with alarm contacts to indicate abnormally high temperatures. this thermometer for protection against high thermal conditions caused by over load Top oil thermometers are provided on all power transformers