LEAKAGE MAGNETIC FIELD REDUCTION METHOD FOR UNDERGROUND POWER CABLE TUNNEL

摘要

PROBLEM TO BE SOLVED: To provide a method for reducing leakage magnetic field derived from an underground power cable tunnel in which a power cable for special high voltage and extra-special high voltage transmission, economically and without narrowing a working space.;SOLUTION: Provided is a method for reducing leakage magnetic field from an underground power cable tunnel 1, in which a plurality of three-set of power cables 10 (R phase+S phase+T phase), which are three-phase three-wire lines, are arranged having intervals between each cable in an underground power cable tunnel 1. The method comprises: stacking each of three-set power cables 10a-10b as if barrels are stacked so that respective axis directions become parallel to each other and that cross-sectional faces intersecting to each axis direction have a same clockwise or counterclockwise phase order viewed from an upstream side of power; and rotating an angular position of a reference phase cable (e.g. R phase) of adjacent three-set power cable in a cross-sectional face by 120 degrees or 240 degrees clockwise, with respect to the angular position of the reference phase cable (e.g. R phase) in each of the three-set power cables 10 stacked in the stacked barrel shape in the cross-sectional face viewed from the upstream side of power.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT