Research Papers

System-Based Safety Tenets Applied to the Extra-High Voltage Transmission Line Design for Common Uses of Highway Right-of-Way

[+] Author and Article Information
Seraphin C. Abou

School of Engineering, University of Saint Thomas, 2115 Summit Ave., Saint Paul, MN 55105 e-mail: abou0006@stthomas.edu

Maarouf Saad

Electrical Engineering Department, Ecole de Technologie Supérieure, 1100 Notre-Dame West, Montreal H3C 1K3, Canada

Manuscript received September 16, 2014; final manuscript received February 24, 2015; published online July 1, 2015. Assoc. Editor: Nii Attoh-Okine.

ASME J. Risk Uncertainty Part B 1(3), 031007 (Jul 01, 2015) (13 pages) Paper No: RISK-14-1056; doi: 10.1115/1.4030590 History: Received September 16, 2014; Accepted May 08, 2015; Online July 01, 2015

The rapidly increasing demand for electricity in recent years resulted in increasing needs of electrical system capacity and deployment for alternate uses of highway right-of-way (ROW) for the purpose of electric power generation, transmission, and distribution. In this framework, a systems approach—fundamental principles of system dynamics for identifying, understanding, and analyzing safety requirements of the extra-high voltage power line (EHV)—is used to objectively focus on two main safety issues related to the design and the risk of the EHV transmission line within highway ROW: (1) assess the design and the operation, and (2) evaluate causally related impacts on the public and workers’ safety that matter. A generalized model of the electromagnetic fields distribution and the clearance model are developed for the analysis of the causally related impacts of a conceptual design and the reliability of materials of construction of the electric systems by introducing the number of exposed individuals and the level of the environmental impacts as a second dimension in addition to the risk factors. A worst-case design scenario is evaluated. Sensitivity analysis of effects of the design attributes such as the route configuration, over voltages, and conductor clearance is performed by determining the magnitude of the electromagnetic field strengths and predicting the resulting maximum voltage. Information obtained on the structural design scenario, conductor size and configuration, insulators, and connectors is of value in determining the safety of the design for operation at extra-high voltages within highway ROW.

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Fig. 1

Double-circuit configuration within highway ROW

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Fig. 2

Schematic design of maximum ROW occupancy scenario

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Fig. 3

Vertical clearance between two towers

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Fig. 4

Sag curve: electric field components at the midspan

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Fig. 5

Magnetic field polarized perpendicular to the z-axis

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Fig. 6

Schematic diagram for HCB safety clearance

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Fig. 7

Lateral E-field distribution for fair quality design

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Fig. 8

Resultant E-fields spatial distribution for fair quality design

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Fig. 9

Design for lower E-field distribution at average current load

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Fig. 10

Design for lower E-field distribution at peak current load

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Fig. 11

Resultant of electric fields: (a) at average current and (b) at peak current

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Fig. 12

EMF risk contour: design for minimum safety

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Fig. 13

Magnetic field in tower vicinity: (a) 1 m above the ground, (b) 1–8 m above the ground, and (c) spatial distribution

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Fig. 14

Design influence on magnetic field distribution: (a) low temperature and (b) high operation temperature



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