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Abstract For the planned, great offshore‐wind farms with extended medium‐voltage cable networks and distances to the onshore grid connection point of 100 km or more, the costs of the cables and their losses play an important role. In this paper basic equations are developed to determine the losses of long three‐phase AC cables, taking into account the longitudinal distributions of current and temperature. It is shown, that the determination of cable losses by means of the line equations based on the nominal ohmic resistance, i.e. in neglecting the temperature‐dependence, may lead to essential errors, with the risk of counterfeited valuations of the installation devices under technical and economical aspects. The relations derived in this paper allow a fast determination of the load‐ and temperature‐dependent cable losses by means of a few, only cable‐specific parameters.
H. Brakelmann (Thu,) studied this question.