Optimum phase configurations for the minimization

Authors: Evangelos I Mimos Dimitrios K Tsanakas Antonios E Tzinevrakis

Publish Date: 2009/11/27

Volume: 91, Issue: 6, Pages: 327-

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Abstract

In this paper underground cable arrangements of two three and more threephase systems are examined which are constituted by singlecore cables Specifically typical flat arrangements of cables are examined as well as a typical arrangement of cables installed inside a tunnel Parametrical investigations are conducted in the phase configurations of the cables in order to reduce the magnetic flux density in the vicinity of the cables and to determine the configurations which produce the minimum maximum values of the magnetic field optimum configurations The optimum phase configurations are verified for various installation depths and various distances between the cables and between the threephase systems In arrangements of two threephase systems without involvement between the two systems there are 36 possible phase configurations Those configurations are categorised in groups of six configurations which produce the same magnetic field In this way six independent configuration groups arise Respectively in arrangements of three threephase systems there are 216 possible phase configurations from which 36 independent groups arise For any number n of threephase systems there are 6 n possible phase configurations from which 6 n1 independent configuration groups arise There is always one group of six phase configurations optimum configurations which cause the greatest reduction drastic reduction of the maximum value of the magnetic flux density

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