Transformer insulation classes are as below table:
Class |
Acceptable max Temp. |
Acceptable max overheat temperature average | |
Nom. Load | Short Cir. | ||
E | 120 C | 75 C | 135 C |
B | 130 C | 80 C | 145 C |
F | 155 C | 100 C | 170 C |
H | 180 C | 135 C | 200 C |
Transformer insulation classes are as below table:
Class |
Acceptable max Temp. |
Acceptable max overheat temperature average | |
Nom. Load | Short Cir. | ||
E | 120 C | 75 C | 135 C |
B | 130 C | 80 C | 145 C |
F | 155 C | 100 C | 170 C |
H | 180 C | 135 C | 200 C |