Discussion
The temperature rise limit of a transformer applies to
Answer: B
Correct answer: the winding and the top oil, each with its own limit
Two limits are specified because they measure different things: the top oil temperature governs the ageing of the oil, while the winding temperature, always the higher of the two, governs the ageing of the paper insulation. Insulation life falls roughly by half for each 6 to 8 degrees of sustained excess, which is why both are monitored.
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