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The transformer cannot be kept full of gas for long time.
True
False
True
Transformers are designed to be filled with insulating oil, which serves both as a dielectric medium and a coolant. Keeping a transformer full of gas instead of oil for an extended period leads to the degradation of solid insulation due to oxidation and moisture absorption, as gas does not provide the same protective, oxygen-free environment as oil.
Transformers are designed to be filled with insulating oil, which serves both as a dielectric medium and a coolant. Keeping a transformer full of gas instead of oil for an extended period leads to the degradation of solid insulation due to oxidation and moisture absorption, as gas does not provide the same protective, oxygen-free environment as oil.
VbdтАЛ=kтЛЕdn тАФ where VbdтАЛ is breakdown voltage, d is insulation thickness, and k,n are constants representing dielectric integrity.
The insulating oil in a transformer prevents the cellulose paper insulation from coming into direct contact with atmospheric oxygen, which causes rapid oxidation (aging). When filled with gas (such as air or nitrogen), the dielectric strength of the insulation system decreases significantly. Furthermore, gas is prone to moisture ingress, which reduces the breakdown voltage of the insulation (VbdтАЛ) and accelerates the formation of acidic byproducts within the transformer tank.
Transformer oil provides essential cooling via convection.
Oil protects solid insulation (cellulose paper) from oxidative degradation.
Prolonged exposure to gas causes moisture absorption, lowering dielectric strength.
Standard maintenance requires ensuring oil levels are maintained to cover active parts.
Oil provides high dielectric strength.
Oil acts as an effective heat transfer medium.
Gas-filled systems allow rapid oxygen contact with paper insulation.
Gas environments lead to accelerated chemical aging of insulation.
Large power transformers
Distribution transformers
The process of paper degradation in the presence of oxygen is known as auto-oxidation.
Nitrogen blanketing is used in some conservator tanks, but the transformer core and windings must remain submerged in oil.
A is correct тАФ Transformer insulation relies on oil for dielectric protection and cooling; replacing this with gas for long durations causes irreversible chemical aging of the paper insulation.
Always remember that transformer oil serves a dual purpose: it is both a dielectric and a coolant; never assume gas can replace it for operational storage.