The difference in air temperature between the inlet and outlet of the generator is related to the heat taken away by the air and the amount of air. In addition, it is also related to the temperature and amount of cooling water. Under the same load, the temperature difference between the inlet and outlet air should remain unchanged, which can be compared with previous operating records. If it is found that the wind temperature difference becomes larger, it means that the internal loss of the generator has increased, or the air volume has decreased. Attention should be paid, and the reasons should be checked and analyzed.
A sudden increase in the internal loss of the generator may be due to a disconnection of a welding head somewhere in the stator winding, damage to the insulation between strands, or local high temperature in the core. The reduced air volume may be due to reasons such as the cooler or air duct being blocked by dirt.