Article | REF: D4439 V1

Overhead lines: heating and electrodynamic loads

Authors: Michèle GAUDRY, Jean-Luc BOUSQUET

Publication date: February 10, 1997

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1. Thermal calculations

Most of the calculations proposed in this paragraph require iterations; for this reason, it is preferable to program the following algorithms to obtain faster and more accurate results.

1.1 Steady-state power balance

Generally speaking, the thermal power balance of a conductor in steady state (thermal equilibrium) is written as follows:

Heating power = Dissipation power ( 1 )
P Joule + P sunshine = P convection ...

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Thermal calculations