What is flash point test of transformer oil?
Flash point of transformer oil is the temperature at which oil gives enough vapors to produce a flammable mixture with air. This mixture gives momentary flash on the application of flame under standard condition. Flashpoint is important because it specifies the chances of fire hazard in the transformer.
What is minimum flash point value of transformer oil?
Minimum Value of Flash Point of Transformer Oil: Flash Point of new Transformer Oil should be more than 140 degree Celsius. In any case, this temperature should not be allowed to be less than 130 degree Celsius for transformer oil in service.
How do you find flash point?
Flash points are determined experimentally by heating the liquid in a container and then introducing a small flame just above the liquid surface. The temperature at which there is a flash/ignition is recorded as the flash point.
What is Breakdown test of flash point test?
Flash point testing is a procedure designed to determine whether a sampled mixture of vapour and air is flammable. It can also determine the temperature at which flammability occurs in a sample. The lowest temperature at which its vapours ignite from an ignition source is the flash point of a material.
What is flash point and pour point of transformer oil?
Typical specifications are: flash point 140 °C or greater, pour point −40 °C or lower, dielectric breakdown voltage 28 kV (RMS) or greater. To improve cooling of large power transformers, the oil-filled tank may have external radiators through which the oil circulates by natural convection.
What is corrected flash point?
FLASH POINT: The lowest temperature corrected to a barometric pressure of 101.3 kPa (760 mm Hg), at which application of an ignition source causes the vapors of a specimen of the sample to ignite under specified conditions of test.
What is the flammability of lubricating oil?
Most lubricating greases contain petroleum-derived mineral oil or hydrocarbon-based synthetic fluid as the lubricating fluid. Those materials are generally considered to be combustible (flash point at or above 38 °C (100 °F).
What is a chemical flash point?
flash point, the lowest temperature at which a liquid (usually a petroleum product) will form a vapour in the air near its surface that will “flash,” or briefly ignite, on exposure to an open flame. The flash point is a general indication of the flammability or combustibility of a liquid.
What is flash point of motor oil?
Common liquids and fuels and their flash points.
| Fuel | Flash Point (oF) |
|---|---|
| Methyl Alcohol (Methanol) | 52 |
| Methylamine | 32 |
| Motor oil | 420 – 485 |
| Naphtha | 32 – 86 |
What is viscosity of transformer oil?
High quality transformer oils are normally in the range of 7- 8 mm2/sec at 40°C and even with such low viscosity, they still meet the requirement for flash point (<135°C) from the same standard.
What is flashpoint insulation?
fire point is the lowest temperature at which a liquid in an open container will attain a vapor pressure sufficient to continue to burn when once ignited.