What are the main properties of transformer oil?
The properties (or parameters) of transformer oil are:
- Electrical properties: Specific resistance, dielectric strength, dielectric dissipation factor.
- Chemical properties: Water content, acidity, sludge content.
- Physical properties: Interfacial tension, viscosity, flash point, pour point.
What happens when transformer oil is low?
A very low oil level can expose energized and current-carrying components that are designed to operate in oil and could result in overheating or an electrical flashover. If the oil level is too high, it could cause over pressurization when the oil expands.
What is the purpose of dielectric oil?
Dielectric liquids are used as electrical insulators in high voltage applications, e.g. transformers, capacitors, high voltage cables, and switchgear (namely high voltage switchgear). Its function is to provide electrical insulation, suppress corona and arcing, and to serve as a coolant.
Why is mineral oil for transformer?
Naphthenic mineral oil has long been the most preferred insulating liquid for power transformer insulation because it has a good pouring point at low temperatures, good thermal cooling capacity, low cost, high efficiency and availability on the transformers market [1, 2, 3, 7].
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 are the two major function of transformer oil?
Transformer oil’s primary functions are to insulate and cool a transformer. It must therefore have high dielectric strength, thermal conductivity, and chemical stability, and must keep these properties when held at high temperatures for extended periods.
Can transformer oil catch fire?
The temperature of oil fires ranges from 960 to 1200 °C, and a transformer oil fire can last from 4 to 28 h34. However, transformer tank explosions do not always result in a fire; the possibility of fire depends on how quickly the transformer protection system operates35.
Why transformer oil testing is required?
Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit for purpose. This is because it tends to deteriorate over time.
Why bushing is used in transformer?
The bushings used for the low voltage winding(s) of a transformer are often solid type with a porcelain or epoxy insulator. … Their purpose is to control the voltage field around the center conductor so that the voltage distributes more uniformly across the surrounding insulation system in the bushing.
Can transformer oil be used for cooking?
It is not exactly edible, though, as the transformer oil contains toxic polychlorinated biphenyls (PCBs), which have been illegal in the U.S. since 1979. But still, chefs are using the stolen oil to make chips and other fried foods.
How does a transformer oil work?
Transformer oil is a mineral based oil that is commonly used in transformers for its chemical properties and dielectric strength. This oil in your transformer acts as an insulator and a cooling agent. Over time, the oil will degrade resulting in the potential for faults and costly repairs.