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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12958

Title: Factors influencing electrical treeing in XLPE insulation
Authors: Malik, N.H.
Al-Abdullah, A.A.
Al-Arainy, A.A.
, M.I Qureshi,
Keywords: Branch type tree; Bush type tree; Electrical treeing; Inception stress; XLPE insulation
Issue Date: 2006
Publisher: IEEE
Citation: European Transactions on Electrical Power Volume 16, Issue 2, March 2006, Pages 205-218
Abstract: This paper reviews the factors that influence the electrical stress required for initiation of electrical trees in crosslinked polyethylene (XLPE) insulation. Mathematical model relating the average tree inception stress with the defect tip radius of curvature has been provided for AC and impulse voltages. The resulting equation for AC treeing inception stress is verified by experimental measurements. Moreover, the effects of voltage magnitude, defect tip radius, and time of voltage application on partial discharge (PD) properties are studied, and the conditions for the initiation of bush- and branch-type trees are identified. For each type of tree, the variation of PD level with tree length is investigated experimentally. The results show that a minimum stress is required below which treeing cannot initiate in XLPE insulation. Moreover, during the early phase of tree propagation, tree length follows a self-limiting growth model and in this phase, tree length and the maximum PD levels are correlated. Copyright © 2005 John Wiley & Sons, Ltd.
URI: http://hdl.handle.net/123456789/12958
ISSN: 1430144X
Appears in Collections:College of Engineering

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