Arrhenius relation insulation

These postulated mechanisms3 are consistent with the observed temperature dependence of the insulator dielectric properties. Arrhenius relations characterizing activated processes often govern the temperature dependence of resistivity. This behavior is clearly distinct from that of conductors, whose resistivity increases with temperature. In short, polymer response to an external field comprises both dipolar and ionic contributions. Table 18.2 gives values of dielectric strength for selected materials. Polymers are considered to possess... 

The only procedure to have been standardised generally is application of the Arrhenius relation (see below). IEC 21662 is a guide to evaluating the thermal endurance of electrical insulating materials and ISO 257863 applies the same principle to determining time/temperature limits to plastics. In both cases, the accent is more on finding maximum service temperatures rather than extrapolating to normal ambient temperature. Use of the same... 

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