Technical Library

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

About us

Datsan Transformer has been established in 1992 especially to work in electricity industy. It has finished dozens of project successfully till 2006 and started to manufacture distribution transformers in 2006.

Datsan has manufactured over 10 thousand of distribution transformers till today and exported to more than 15 countries.

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Datsan Elk.İnş.San.ve Tic.Ltd.Şti.
Adr: Kızıltepe Mardin Karayolu 6.km
Kızıltepe, 47400 Mardin TURKEY

T : +90 (482) 215 3188
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