ETO ETO Exam papers 📅 Jul 2024

Exam Question

(a) Explain the potential hazards if liquid-cooled transformers are used. (6)

(b) In a 25 KVA, 3300/233 V, single phase transformer, the iron and full-load Cu. losses are respectively 350 and 400 watts. Calculate the efficiency at half-full load, 0.8 power factor. (10)

Reference Answer

(a) Potential hazards of using liquid-cooled transformers:
The heating of oil during transformer operation can lead to the generation of oil vapors, which are flammable and pose a significant fire risk if exposed to ignition sources.
The cooling oil can degrade due to continuous agitation. This deterioration can lead to overheating of the transformer.
The cooling oil can degrade in marine environments due to continuous agitation and exposure to seawater. This deterioration can lead to overheating of the transformer.

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