Method and apparatus for monitoring the isolation of an it-grid

G - Physics – 01 – R

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Details

G01R 27/18 (2006.01) G01R 31/12 (2006.01) H02M 7/00 (2006.01)

Patent

CA 2754692

For monitoring the isolation of an IT-grid with respect to ground, comprising an inverter (4) connecting a direct current side (5) with an alternating current side (6) of the IT-grid (1) and a photovoltaic device (2) on the direct current side (5) of the IT-grid (1) at least one isolation resistance (R p, R n) of the direct current side (5) with respect to ground is monitored for falling below a resistance threshold value while the inverter (4) is running, and additionally a leakage current via the inverter (4) towards ground is monitored for exceeding a current threshold value.

L'invention concerne un procédé de contrôle de l'isolement d'un réseau IT par rapport à la terre, comprenant : un onduleur (4) connectant galvaniquement, un côté continu (5), avec un côté alternatif (6) du réseau IT (1), et une installation photovoltaïque (2) sur le côté continu (5) du réseau IT (1); le procédé consiste à contrôler au moins une résistance d'isolement (Rp, Rn) du côté continu (5) vis-à-vis de la terre, pour un onduleur en fonctionnement, de manière à voir si l'on n'est pas en dessous d'une valeur limite de résistance. L'invention est caractérisée en ce qu'en outre, on contrôle un courant de fuite, via l'onduleur (4) vers la terre, de manière à voir si l'on ne dépasse pas une valeur limite d'intensité.

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