When the oil-immersed power transformer is in operation, the heat of the winding and the core is first transferred to the oil, and then to the cooling medium through the oil. The cooling methods of oil-immersed power transformers can be divided into the following types according to the size of the capacity:
1. Natural oil circulation natural cooling (oil-immersed self-cooling)
2. Natural oil circulation air cooling (oil-immersed air cooling)
3. Forced oil circulation water cooling
4. Forced oil circulation air cooling
Normal use conditions
1. Altitude not exceeding 1000m indoors or outdoors
2. Maximum ambient temperature +40℃ Maximum daily average temperature +30℃
3. Maximum annual average temperature +20℃ Minimum temperature -25℃
4. Transformers operating under special use conditions can be provided according to user requirements
