Vol. 56

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2017-05-05

Variation in Phase Shift of Phase Arrangements on Magnetic Field Underneath Overhead Double-Circuit HVTLs : Field Distribution and Polarization Study

By Akinlolu A. Ponnle, Kazeem Bolade Adedeji, Bolanle Tolulope Abe, and Adisa A. Jimoh
Progress In Electromagnetics Research M, Vol. 56, 157-167, 2017
doi:10.2528/PIERM16110304

Abstract

The currents flowing through a transmission line produce a rotating magnetic field of vertical and horizontal components which are orthogonal in space and vary with time. Buried and aerial metallic pipelines that run parallel to or are placed in the vicinity of overhead AC high voltage transmission lines are affected by this field resulting in an induced voltage on the pipelines. Several related studies and safety standards dealing with this problem have been published. Nevertheless on a multi-circuit line, the issue of current phase shift variation has not been fully covered yet. This paper provides a detailed analysis of the effect of current phase shifts on the magnetic field distribution and polarization pattern around power lines using analytical approach from electromagnetic field theory. In this study, not only the variation of the filed distribution with phase arrangements and phase shifts is further established, but also the characteristic nature of the variation of the field distributions for six phase arrangements is examined in more detail. The results show that the magnetic field distribution at the ground level and the spatial distribution of the magnetic field polarization ratio vary significantly with the phase sequence arrangement as well as the current phase shifts between the two circuits. The field polarization differs at different locations. The information from the results can be useful for consideration in designing an effective AC mitigation technique and in placing pipelines in the utility corridor with power lines. Pipelines should be placed in a region of minimum field intensity within the right-of-way of the line, in order to have minimal induction on the pipeline in normal operating conditions of the line.

Citation


Akinlolu A. Ponnle, Kazeem Bolade Adedeji, Bolanle Tolulope Abe, and Adisa A. Jimoh, "Variation in Phase Shift of Phase Arrangements on Magnetic Field Underneath Overhead Double-Circuit HVTLs : Field Distribution and Polarization Study," Progress In Electromagnetics Research M, Vol. 56, 157-167, 2017.
doi:10.2528/PIERM16110304
http://www.jpier.org/PIERM/pier.php?paper=16110304

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