Mahmod, Luqman Hakim (2022) Onsite measurement techniques and modelling to minimize magnetic field strength under overhead transmission lines. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

This research aims to provide thorough planning of magnetic field (MF) level measurement execution in a residential area within the vicinity of overhead transmission lines (OTL). The expected outcome of the measurement is to provide a meticulous set of MF level profiling radiated from OTL in a large area. The MF level profiling recorded can also determine whether it complies with the MF exposure limit of 100 μT as provided by the International Commission of Non-Ionizing Radiation Protection (ICNIRP). Conducted in Kolej Kediaman Bestari UTHM as a case study, MF radiation from 132 kV and 275 kV power lines in that area are recorded throughout three different stages of development (during construction, after construction while vacant, and after construction while occupied). The MF at a maximum of 1 μT is recorded throughout the measurements, and the presence of MF level radiation from sources other than the OTL is observed. In addition to that, a few solutions for reducing MF radiation from OTL systems are proposed, which are the implementation of conductor phase rearrangements, reconductoring and composite cross-arms. These solutions heavily emphasize the modifications of existing OTL systems, which also provide the opportunity to improve ampacity. Data regarding these solutions are obtained through mathematical calculation and Ansys Maxwell engineering software simulation based on IEEE standards, CIGRE and other researchers. By analysing these data, existing OTL systems in Malaysia can be enhanced with the correct combination of solutions, up to 65% MF reduction or up to 52% ampacity increment. Therefore, this research's MF level measurement planning can serve as a guideline for personal and commercial gains. The solutions proposed can offer a healthier living environment while coping with the increasing electricity demands

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