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Mention the properties of transformer oil.

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Properties of transformer oil are,

a) Colour – pale yellow. 

b) Moisture content - <10 ppm. 

c) Acidity (KOH/gramme of oil) – <0.1. 

d) Dielectric strength – limit value is 45 kV and preferable value is 60 kV. 

e) Flashpoint - 141º C. 

f) Inter-surface tension – 30 to 40 dynes / cm or 0.3 to 0.4 Newton. 

g) Resistivity – 

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