NDLI: Controlling the thermal environment of underground cable lines using the pavement surface radiation properties

Content Provider	IET Digital Library
Author	Klimenta, Dardan Perović, Bojan Klimenta, Jelena Jevtić, Milena Milovanović, Miloš Krstić, Ivan
Abstract	The main purpose of this study is to show how the emissivity and absorptivity of a pavement surface above underground cables affect their ampacity. The use of cool pavements whose surfaces absorb less heat from the Sun than they emit to the ambient is considered as a novel method to control the thermal environment of underground cables. The method predicts that the trench along the entire length of a 110 kV cable line is completely filled with quartz sand and paved with a cool pavement. Quartz sand would provide good conduction of heat from the cables to the earth and pavement surfaces, while a paved surface of the trench would establish approximately unchangeable convection and radiation boundary conditions along the entire cable line route. It is assumed that the three-phase system is balanced and that the boundary conditions along the earth and pavement surfaces are the most unfavourable. The novel method is based on the results of experimental research, generalised and verified numerically using the finite-element method in COMSOL. Finally, it is established that the ampacity of the 110 kV cable line can be increased up to 26.7%.
Starting Page	2968
Ending Page	2976
Page Count	9
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 12, Jul (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.1298
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-04-04
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	COMSOL Control of Electric Power System Convection Cool Pavements Heat Conduction Pavement Surface Absorptivity Pavement Surface Emissivity Pavement Surface Radiation Property Power Cables Quartz Sand Radiation Boundary Condition Temperature Control Thermal Environment Control Thermal Variables Control Three-phase System Underground Cable Line Underground Cables Voltage 110 KV
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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