High temperature limits the what carrying capacity of transformers?

High temperature limits the what carrying capacity of transformers?

• A. Voltage
• B. Current
• C. Frequency
• D. Power

Answer: (B)

High temperatures limit the amount of current a transformer can safely carry. The windings heat up when current flows due to I^2R losses, and this heat must be removed by the transformer's cooling system. The insulation around the windings has a maximum hot-spot temperature it can tolerate without degrading or failing. When ambient temperature is high, the same current produces a larger temperature rise, so the safe operating current (ampacity) must be reduced to stay within insulation and cooling limits. Voltage and frequency are fixed by design and system, while the available power is tied to how much current can be carried without overheating. So, the hotter it gets, the lower the current carrying capacity.

High temperatures limit the amount of current a transformer can safely carry. The windings heat up when current flows due to I^2R losses, and this heat must be removed by the transformer's cooling system. The insulation around the windings has a maximum hot-spot temperature it can tolerate without degrading or failing. When ambient temperature is high, the same current produces a larger temperature rise, so the safe operating current (ampacity) must be reduced to stay within insulation and cooling limits. Voltage and frequency are fixed by design and system, while the available power is tied to how much current can be carried without overheating. So, the hotter it gets, the lower the current carrying capacity.