Insulation Resistance of Windings of Power Transformer
Rated Voltage of the windings
Minimum safe insulation resistance in Megaohms at Temperature
(1)
(2)
(3)
(4)
(5)
30°C
40°C
50°C
60°C
65k V and Above
600
300
150
75
33k V
500
250
125
65
6.6k V 11k V
400
200
100
50
Below 6.6 k V
200
100
50
25
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