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Three dimensional characterisation of electrical trees

DOI: 10.1109/CEIDP.2013.6748152 DOI Help

Authors: Roger Schurch (The University of Manchester) , Simon M. Rowland (The University of Manchester) , Robert S. Bradley (The University of Manchester) , Philip J. Withers (The University of Manchester)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: 2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena
Peer Reviewed: No

State: Published (Approved)
Published: October 2013
Diamond Proposal Number(s): 5898

Abstract: Most of the geometric analysis of the structure of electrical trees has been performed using a two-dimensional (2-D) approach. However, electrical trees grow three-dimensionally (3-D). We have recently shown that electrical trees can be 3-D imaged. A 3-D virtual replica can be created and through it, the tree characteristics analysed. Laboratory created electrical trees in polymeric insulation were scanned using X-ray computed tomography (XCT) for 3-D model reconstructions. Global parameters such as diameter of tree channels, tree surface and volume were determined. The fractal dimension from 2-D projected patterns resulted to be lower than the fractal dimension from the entire 3-D model for bush and branch-type trees. Local parameters such as numbers of channels, area covered by them and proportion of area degraded at a given cross-section were also calculated. Using the skeleton for analysing the tree structure, indexes such as number of vertices, segment length, vertex density, tortuosity and branch angle were calculated. Among them, vertex density provided a marked difference in value between a bush and a branch-type electrical tree. It is pointed out that using this 3-D approach for analysis, a more real and complete insight of the structure of electrical trees is achieved.

Subject Areas: Engineering
Collaborations: Diamond Manchester

Instruments: I13-2-Diamond Manchester Imaging