1. The internal control standard of the winding of a general oil-immersed power transformer is 65 degrees Celsius relative to the temperature rise of the air around the transformer. This refers to the average temperature rise of the winding, not the hottest temperature rise, and is considered according to the Class A insulation level (105 degrees). However, it is generally controlled below 65 degrees Celsius when the transformer is designed.
2. my country's transformer standards stipulate that the highest annual average temperature of the ambient temperature is 20 degrees, the highest monthly average temperature is 30 degrees, and the highest temperature is 40 degrees.
3. Under normal circumstances, the user cannot detect the winding temperature. But the oil top temperature can be detected. Therefore, the transformer manufacturer stipulates that the oil top temperature rise is 55 degrees Celsius. Of course, it will also be controlled below 55 degrees Celsius during design and manufacturing. In this case, the winding temperature rise does not exceed 65 degrees Celsius. Therefore, the operation department stipulates that no matter how much the ambient temperature is, the transformer oil top temperature cannot exceed 85 degrees. This can ensure that the hottest temperature of the transformer winding does not exceed 98 degrees. The average winding temperature does not exceed 85 degrees. In this case, the transformer life is 20 years. The oil temperature of the oil-immersed transformer during operation should be considered to prevent the transformer oil from deteriorating too quickly. When the transformer oil reaches 85 degrees Celsius, an alarm will be sounded, and when the maximum temperature reaches 95 degrees Celsius, the transformer switch will be tripped.