NDLI: Determination of minimum air clearances for a 420kV novel unibody composite cross-arm

Content Provider	IEEE Xplore Digital Library
Author	Jahangiri, T. Bak, C.L. da Silva, F.F. Endahl, B.
Copyright Year	2015
Description	Author affiliation: BYSTRUP Architects, Denmark (Endahl, B.) \|\| Aalborg Univ., Aalborg, Denmark (Jahangiri, T.; Bak, C.L.; da Silva, F.F.)
Abstract	One of the most important requirements of any overhead line tower is determining the air clearances between live parts and earthed parts such as phase conductor and tower structure. In contrast to traditional steel lattice towers, the recently introduced fully composite pylon is completely made of non-conductive materials and the air clearances along the unibody cross-arm of the pylon depend on corresponding insulation lengths. The first step in electrical design of fully composite pylon is dimensioning the air clearances which, are required to specify the mechanical and material designs. This paper presents the insulation coordination studies to determine minimum required air clearances on the unibody cross-arm. The procedure and relevant equations to calculate minimum air clearances to avoid flashover between phases' conductors as well as top phase conductor and shield wire are based on the theoretical formulae reported in EN 50341-1. Considering differences in gap types, the calculated values of air clearances are compared with the recommended values by CIGRÉ TB 72, EN 50341-1 and IEC 60071-1, 2 and as a result one empirical value and one calculated value are determined as phase-to-earth and phase-to-phase air clearances, respectively. Subsequently, internal clearances at the tower and within the span are specified according to the three load cases (maximum conductor temperature, wind and ice) given in EN 50341-3, NNAs - DK.
Starting Page	1
Ending Page	6
File Size	268091
Page Count	6
File Format	PDF
e-ISBN	9781467396820
DOI	10.1109/UPEC.2015.7339949
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-09-01
Publisher Place	UK
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Insulation Poles and towers Lightning unibody cross-arm Air clearance insulation standards overhead line Surges IEC Standards Stress insulation coordination
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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