Method for dectection of a ground fault, which occurs in the...

Details Method for dectection of a ground fault, which occurs in the... Method for dectection of a ground fault, which occurs in the...

G - Physics

01

R

G01R 31/06 (2006.01) G01R 31/02 (2006.01) G01R 31/34 (2006.01) G01R 31/42 (2006.01)

Patent

CA 2467106

The invention relates to a method for detecting a short-to-ground (18) occurring in the proximity of a neutral point (22) in a multiphase electrical device, particularly an electrical machine (10) or a transformer, which is operated with a basic frequency and has a number of windings (11, 12, 13) assigned to the individual phases. These windings are each connected, with one end, to the neutral point (22) and, with the other end, directly to a supply mains via a mains connection (14, 15, 16). A simple and reliable detection is achieved by virtue of the fact that the change in physical quantities that is linked to a short-to-ground (18) is measured and evaluated in the immediate surroundings of the earth-to-ground (18).

L'invention concerne un procédé de détection d'une mise à la terre (18) survenant à proximité d'un point neutre (22) dans une installation électrique, polyphasée, alimentée par une fréquence de base, notamment d'une machine (10) électrique ou d'un transformateur, qui présente une pluralité d'enroulements (11, 12, 13) disposés en phases uniques d'un câble haute tension (30). Lesdits enroulements sont reliés respectivement par une extrémité au point neutre (22) et par l'autre extrémité directement au réseau au moyen d'une alimentation sur réseau (14, 15, 16). Selon l'invention, une détection facile et sûre peut être réalisée en mesurant et en évaluant des variations relatives à une mise à la terre de différentes grandeurs physiques dans un environnement immédiat à la mise à la terre (18).

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