| 摘要 |
Three single-conductor cables are laid down such that viewed in cross-section they are located at the vertices of an equilateral triangle, or else they are laid down in a common plane. Each cable is internally water cooled, and provided with a respective return-flow pipe for cooling water. The return-flow pipes are located on phase-angle loci for two phase angles phi 11 and phi 12, where the phase angle in question is the phase angle of the longitudinal voltage induced in the return-flow pipes by current flowing in the cables. The two phase angles differ by 180 DEG . As a result, no longitudinal voltages are induced in the return-flow pipes and/or the longitudinal voltages induced in successive sections of the pipes cancel each other out so as to result in no net induced longitudinal voltage.
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