Insulation Resistance At High Temperature

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Insulation Resistance At High Temperature

Experiments have hove shown that the insulation resistance of the insulators decreases rapidly with the increase in temperature following the logarithmic curve, If R1 is the insulation resistance at t10C, then its insulation resistance R2 at t20C is given by

Loge R' 2 = Loge  R1' -K(t2-t1)

Loge R1 '= K (t2-t1) where K is a constant, whose value is determined form the initial conditions.
       R2
If the insulation resistance becomes 1 of the resistance at the initial temperature for a rise of x0C then
                                                    n
by substituting R1'  = n and t2-t1=x in above expression
                      R2'
we get loge n=Kx

or            K = 1  loge n
                     x

Now the insulation resistance for any rise of temperature (say, t) can be determined form the relation

loge R2' = loge R'1-t  loge n
                           x

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