Effects of magnetic core geometry on false detection in residual current sensor

Bruno Colin (1) , Christian Chillet (1) , Afef Kedous-Lebouc (1) , Patrick Mas (2)

1 G2ELab - Laboratoire de Génie Electrique de Grenoble
2 LEG - Laboratoire d'électrotechnique de Grenoble

Under high-supply current, residual circuit breakers are subject to abnormal tripping, caused by false residual currents. Geometric or magnetic anomalies in the circuit breaker ring core seem to be responsible for these abnormal currents. This paper studies a few anomalies (spiral shape effect, conductor eccentricity, lamination effect) and calculates different contributions using the finite element simulations. The results show that the ring core, made of thin wound magnetic tape, is particularly sensitive to primary conductor eccentricity.

Mots clés: Differential circuit breaker; Ring core; Nuisance tripping

Domaines: Energie électrique

Bruno Colin, Christian Chillet, Afef Kedous-Lebouc, Patrick Mas. Effects of magnetic core geometry on false detection in residual current sensor. Journal of Magnetism and Magnetic Materials, 2006, pp.804-806. ⟨10.1016/j.jmmm.2006.02.273⟩. ⟨hal-00192256⟩