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8. Appendix 2: Line conductor resistance
The effective resistance of a conductor varies with temperature and with the frequency of the current flowing through it.
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Temperature correction
Evening r 20 the kilometric resistance at 20 °C and r the resistance at θ °C.
We have :
r = r 20 [1 + α (θ C – θ 20 )] This relationship is approximate, but sufficiently accurate for current cable temperatures in service.
The values of the temperature coefficients α for the main metals and alloys used for cables are given...
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Appendix 2: Line conductor resistance
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The Ultimate Scientific and Technical Reference