Insulation Grade Division Of Power Transformer Windings
Release Time：
2021-05-08
In order to ensure the reasonable operation of power transformers, the safety of power transformers has also been done a lot. One of the more important technologies for the safety of power transformers is to increase its insulation performance, which makes the operation of power transformers safer and has greater impact on the human body.
In order to ensure the reasonable operation of power transformers, the safety of power transformers has also been done a lot. One of the more important technologies for the safety of power transformers is to increase its insulation performance, which makes the operation of power transformers safer and has greater impact on the human body. According to different grades and standards, the division of insulation grades of power transformers is also different. The specific divisions are as follows:
Insulation grade refers to the heat resistance grade of the insulating material used, divided into A, E, B, F, and H grades. Insulation temperature class A class E class B class F class H class
Higher allowable temperature (℃) 105 120 130 155 180
Winding temperature rise limit (K) 60 75 80 100 125
Performance reference temperature (℃) 80 95 100 120 145
The power of the primary and secondary coils of an ideal power transformer is equal to P1=P2. It shows that the power transformer itself has no power loss. The actual power transformer always has losses, and its efficiency is η=P2/P1. The efficiency of power transformers is very high, reaching more than 90%.
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