What are the reasons for the large temperature difference among the three phases of dry-type transformers?
Due to the radiation heat transfer between phase B and phase A and C, and the temperature of phase A and C is relatively high, the temperature of phase B must be relatively high after radiation heat transfer. In order to prove this, 1. the thermal calculation software such as ANSYS shows that the temperature of phase B is about 10K higher than that of phase A and C; 2. The actual measurement, such as scanning the winding surface temperature with the infrared temperature meter, shows that the temperature of phase B is about 10K higher than that of phase A and C.
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