Class Y insulation can withstand a max temperature of 90 degrees centigrade. Examples are Cotton, Silk, Paper, Wood, Cellulose, etc.
The maximum temperature in Class F insulation is 150* C.
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This is because the oil has flash over point at 140 deg.Cl and the winding insulation cannot exceed the flash point of the oil.
Depending on the size of the transformer, several different types of insulator are used. These include varnishes, plastics, paper, and fabrics (to insulate the windings), wood (spacers), and oil. Transformer oil improves the insulation value of paper, fabrics, and wood when absorbed by them. The oil has a secondary purpose, which is to cool the transformer.
NCC Class WT was created in 1946.
The maximum temperature in Class F insulation is 150* C.
Class F insulation is the class of insulation which will give a service life of 20000 hours when maintained continuously at a temperature of 155 degee, which is the temperature index of class F.
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Class 7 refers to noise insulation. There may be a bit of confusion between insulation classes.There is Electrical insulationHeat insulation andNoise insulation.Each have their own classification numbers and/or letters.
WAGR Y class was created in 1953.
TGR Y class was created in 1961.
NER Class Y was created in 1910.
A class Y felony generally involves parties under the age of 18. Drug sale to minors and rape of minors are considered class Y felonies.
Copper conductor 'y' - PVC Insulation 'W' - Steel Round Wire Armour 'y' - PVC Outer Sheeth
Victorian Railways Y class - diesel - was created in 1963.
South Australian Railways Y class was created in 1885.
2X - XLPE insulation W - Copper conductor Y - PVC sheath