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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12854

Title: DISCHARGE INCEPTION VOLTAGES DUE TO VOIDS IN POWER CABLES.
Authors: Malik, N.H.
Al-Arainy, A.A.
Kailani, A.M
Khan, M.J.
Keywords: COAXIAL BELTED CABLES; CRITICAL CAVITY SIZE; DISCHARGE INCEPTION VOLTAGES; GASEOUS VOIDS
Issue Date: 2004
Publisher: IEEE
Citation: IEEE transactions on electrical insulation Volume EI-22, Issue 6, Pages 787-793
Abstract: Expressions are derived for the inception voltage at which discharges occur in gaseous voids entrained within the insulation of single and three-core, screened as well as belted, power cables. The inception voltage V//i depends upon the conductor diameter, the insulation thickness, the dielectric permittivity, the location, shape and length L of the void, and the pressure P of the gas inside the void. It is shown that for a given cavity, V//i depends upon the product PL as well as P. For a cavity of known shape, size, and location, a minimum voltage V//m//i//n exists below which partial discharges do not occur. The voltage V//m//i//n decreases with increasing void size and is lower for cylindrical voids when compared to spherical ones. For a given cable of known voltage rating, a critical cavity size L//c//r//i//t is defined. Any cavity smaller than this critical size can be tolerated in the cable insulation without the risk of partial discharges. Expressions to compute V//m//i//n and L//c//r//i//t are given for coaxial as well as belted power cables.
URI: http://hdl.handle.net/123456789/12854
ISSN: 00189367
Appears in Collections:College of Engineering

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