In:
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Emerald, Vol. 27, No. 1 ( 2008-01-04), p. 246-255
Abstract:
Geometric or magnetic anomalies in the wound magnetic core of a residual current circuit breaker can be responsible of its abnormal tripping. The purpose of this paper is to analyse the core shape contribution to false residual currents (FRCs). Design/methodology/approach To study precisely the core shape contribution, FEM simulations are investigated. First a 2D multilayer geometry is described thanks to linear regions. Then an apparent anisotropic bulk core is developed and validated in 2D and in 3D. Findings The air gaps between the magnetic layers develop a shielding effect responsible of the core high sensibility to primary conductors eccentricity. This effect can be easily represented using an anisotropic bulk core model. Research limitations/implications The anisotropic material model is basic and has known limitations. Future research should see the development of a new model. Originality/value FRCs can considerably disturb operation of residual current device. This paper provides new hypothesis on the origin of theses currents and proposes an anisotropic magnetic material model that simplifies FRC study.
Type of Medium:
Online Resource
ISSN:
0332-1649
DOI:
10.1108/03321640810836807
Language:
English
Publisher:
Emerald
Publication Date:
2008
detail.hit.zdb_id:
1501321-2
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