Wound magnetic core consequences on false residual currents

• B. Colin ^[1] ; A. Kedous-Lebouc ^[1] ; C. Chillet ^[1] ; P. Mas ^[2]
  1. [1] G2Elab INPG UJF CNRS UMR 5269
  2. [2] Schneider Electric
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 27, Nº 1, 2008, págs. 246-255
• Idioma: inglés
• Enlaces
  • Texto completo
• Resumen

  • Purpose – 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.