The operating temperature standards for dry-type transformers are closely related to the thermal endurance classes of the insulating materials they employ. Below is a table outlining the operating temperature standards for dry-type transformers based on different insulation classes:

　Operating Temperature Explanation:

　　Temperature Rise Limit: Refers to the difference between the temperature of a transformer component and the temperature of the external cooling medium (such as cooling air) when the transformer is operating under rated load. For example, if a dry-type transformer has a rated temperature rise of 90K and operates in an environment with a temperature of 40°C, its maximum temperature would be 130°C (90K + 40°C).

　　Operating Temperature Monitoring: Dry-type transformers are typically equipped with temperature controllers for monitoring purposes. Common settings include automatically turning off the fan at 80°C, turning on the fan at 100°C, issuing a high-temperature alarm at 130°C, and tripping the transformer at 150°C due to excessive temperature.

　　Temperature Impact: Excessively high operating temperatures can accelerate the aging of insulating materials, shorten the transformer's service life, and even lead to failures. Therefore, it is essential to strictly control the operating temperature and avoid prolonged operation at elevated temperatures.Precautions:

　　Ambient Temperature: The operating temperature of a dry-type transformer is also influenced by the ambient temperature. In high-temperature environments during summer, special attention should be paid to the transformer's cooling situation to prevent temperature overruns due to excessive ambient temperatures.

　　Cooling Measures: To ensure that the transformer operates within the allowed temperature range, effective cooling measures must be taken, such as installing cooling fans and optimizing the ventilation design of the transformer room.