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Control of line-to-line overvoltages for helicopter-based live work on a 500 kV transmission line

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5 Author(s)
Smith, J.W. ; Electr. Power Res. Inst., Knoxville, TN ; Gela, G. ; McGranaghan, M.F. ; Hoppe, C.C.
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Transient overvoltage protection during live maintenance of high voltage transmission lines is necessary to prevent line-line sparkovers due to possible transient overvoltages. Portable protective air gaps(PPAGs) along a transmission line under maintenance are proposed to limit the line-ground voltage transients. Previous work has shown that a 41 inch rod gap installed along the line for sparkover protection will provide protection at approximately 1.7 per unit on a 500 kV system. The PPAG had not previously been used to provide protection line-line, however. This paper presents the results from a study that confirms whether PPAGs installed line-ground could also provide adequate protection from line-line overvoltages, and to determine the optimal installation scheme of sets of PPAGs over the length of the line or line section.

Published in:

Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE

Date of Conference:

20-24 July 2008