Bibliothèque technique

Insulation Resistance Correction Values According to Temperature

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  • You may use below numbers to correct the insulation resistance values to 20 °C.
  • For example, assume you have an oil filled transformer and you get a reading of 1200 megaohms at a temperature of 35 °C. From table below you read accross at 35 °C to next column and obtaion the factor 2,80. Then your corrected resistance value is : 1200 megaohms x 2,80 = 3360 megaohms at 20°C.

Temperature

Temperature Correction Factor for Oil Filled Transformers
°C °F
0 32 0,25
5 41 0,36
10 50 0,50
15 60 0,74
20 68 1,00
25 77 1,40
30 86 1,98
35 95 2,80
40 104 3,95
45 113 5,60
50 122 7,85
55 131 11,20
60 140 15,85
65 149 22,40
70 158 31,75
75 167 44,70

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