Research Papers

High-Ampacity Overhead Power Lines With Carbon Nanostructure–Epoxy Composites

[+] Author and Article Information
V. S. N. Ranjith Kumar, G. Pal

Institute Center for Energy (iEnergy),
Department of Mechanical and
Materials Engineering,
Masdar Institute of Science and Technology,
P.O. Box 54224,
Abu Dhabi, UAE

S. Kumar

Institute Center for Energy (iEnergy),
Department of Mechanical and
Materials Engineering,
Masdar Institute of Science and Technology,
P.O. Box 54224,
Abu Dhabi, UAE
e-mails: kshanmugam@masdar.ac.ae; s.kumar@eng.oxon.org

Tushar Shah

Applied Nanostructured Solutions, LLC,
2323 Eastern Boulevard MP 50,
Baltimore MD, 21220

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received September 6, 2015; final manuscript received June 27, 2016; published online August 9, 2016. Assoc. Editor: Harley Johnson.

J. Eng. Mater. Technol 138(4), 041018 (Aug 09, 2016) (9 pages) Paper No: MATS-15-1217; doi: 10.1115/1.4034095 History: Received September 06, 2015; Revised June 27, 2016

Design of high-performance power lines with advanced materials is indispensable to effectively eliminate losses in electrical power transmission and distribution (T&D) lines. In this study, aluminum conductor composite core with carbon nanostructure (ACCC–CNS) coating in a multilayered architecture is considered as a novel design alternative to conventional aluminum conductor steel-reinforced (ACSR) transmission line. In the multiphysics approach presented herein, first, electrothermal finite element analysis (FEA) of the ACSR line is performed to obtain its steady-state temperature for a given current. Subsequently, the sag of the ACSR line due to self-weight and thermal expansion is determined by performing thermostructural analysis employing an analytical model. The results are then verified with those obtained from the FEA of the ACSR line. The electrothermal finite element (FE) model and the thermostructural analytical model are then extended to the ACCC–CNS line. The results indicate that the ACCC–CNS line has higher current-carrying capacity (CCC) and lower sag compared to those of the ACSR line. Motivated by the improved performance of the ACCC–CNS line, a systematic parametric study is conducted in order to determine the optimum ampacity, core diameter, and span length. The findings of this study would provide insights into the optimal design of high-performance overhead power lines.

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Fig. 1

Schematic diagram representing the cross-sectional details of stranded and equivalent cylindrical cross sections: (a) ACSR line and (b) ACCC–CNS lines

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Fig. 2

SEM images: ((a) and (b)) bundles of aligned CNTs (CNS) grown on glass fiber substrate. ((c) and (d)) CNS sheared off from the substrate.

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Fig. 3

FE mesh of cross section: (a) ACSR line and (b) ACCC–CNS line

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Fig. 4

The flowchart for the sag calculation by HSM

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Fig. 5

Sag of the line between supporting towers

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Fig. 6

Comparison of surface temperature for ACSR–Drake transmission line as a function of the current: IEEE standard versus FEA

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Fig. 7

Comparison of surface temperature of ACCC–CNS line with its equivalent ACSR line obtained from FEA as a function of the current

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Fig. 8

Temperature (Kelvin) contour plots of the line at different time intervals from transient coupled thermal–electrical analysis of (a) ACSR–Drake line and (b) ACCC–CNS line

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Fig. 9

Sag for ACSR–Drake line at different operating temperatures obtained using NSM, HSM, and FEA

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Fig. 10

Displacement contour plot of ACSR–Drake line representing the sag between two transmission towers obtained from FEA

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Fig. 11

Sag for ACCC–CNS line and its equivalent ACSR line as a function of operating temperature by HSM

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Fig. 12

The flowchart for parametric study

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Fig. 13

ACCC–CNS line sag variation as a function of the core diameter of the line operating at its CCC of each configuration for given span length

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Fig. 14

ACCC–CNS line sag variation with respect to span length for a given core diameter

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Fig. 15

Optimal performance map: ACCC–CNS line sag and CCC for different core diameters and span lengths




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