The effective resistance of a conductor varies with temperature and with the frequency of the current flowing through it.
Temperature correction
Evening r20 the kilometric resistance at 20 °C and r the resistance at θ °C.
We have :r = r20 [1 + α (θC– θ20 )]
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 in the Conductors section of the Overhead Lines article
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(1) - CARSON (J.R.) - Wave propagation in overhead wires with earth return. - Bell System technical journal, n° 5, p. 539-554, oct. 1926.
(2) - POLLACZEK (F.) - Sur le champ produit par un conducteur simple infiniment long parcouru par un courant alternatif. - Traduit par POMEY (J.B.). –...
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