What is PCB oil?
PCBs are a group of man-made organic chemicals consisting of carbon, hydrogen and chlorine atoms. The number of chlorine atoms and their location in a PCB molecule determine many of its physical and chemical properties. PCBs have no known taste or smell, and range in consistency from an oil to a waxy solid.
Does transformer oil contain PCB?
Electrical insulating mineral oils in a number of transformers contain measurable amounts of polychlorinated biphenyls (PCBs). An EPRI project investigated four possible approaches for removing PCBs from contaminated mineral oil.
Is a 335 a standard?
This standard, first published in 1953, was based on BS 148 : 1951 ‘Insulating oil for transformers and switchgear’, issued by the British Standards Institution. … Separate standard, IS 12463 : 1988 ‘Specification for inhibited mineral insulating oils’ has since been brought out for inhibited mineral insulating oils.
How can you tell if a transformer has a PCB?
Some nameplates specify the brand of cooling liquid inside the transformer. If one of the brand names listed in Table 1 appears on the nameplate, the transformer contains PCBs.
Is transformer oil edible?
The oil reportedly looks just like regular cooking oil, but it lasts much longer. 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. Dr.
Is transformer mineral oil Hazardous?
It’s also highly flammable. If a transformer were to leak mineral oil, it could easily start a fire. … And although mineral oil is relatively more benign than PCBs, it’s nonetheless an environmental contaminant that requires careful hazardous material removal.
How do I choose a transformer oil?
Electrical properties: Dielectric strength, or the ability to serve as an effective insulator, is the main concern in this area. An oil should have a known (specific) level of resistance, which is voltage divided by current (R = V/I) and is sensitive to temperature changes in the transformer.
What is naphtha based transformer oil?
Naphtha-based transformer oil:
Naphtha is more soluble than Paraffin oil. The sludge of Naphtha oil does not precipitate in the bottom of the transformer and does not disturb the transformer cooling system. The use of Naphtha oil is less than Paraffin oil because it is not easily available in our country.
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.