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Electrical Applications 2 by David W. Tyler

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42
Materials
and
their applications
in the
electrical
industry
increases with temperature (7
R
increases). As ò increases, the loss
increases, giving rise to more heat and further temperature rises. It
can be envisaged that this could lead to failure if the temperature
were allowed to rise too far. This is particularly important in very
high voltage cables where the heat produced by this effect becomes
very nearly as great as that due to conduction losses in the conductor
(PR losses). See also page 50, 'Heating of cables'.
Breakdown voltage If a sufficiently high voltage is applied to any insulating material it
will break down and becom