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IT supply : EMC level with ATV

Goals and Symptoms


IT supply : EMC level with ATV

Facts and Changes


IT supply : EMC level with ATV

Causes and Fixes

1) With IT supply, there is a high impedance between the neutral of the main transformer and the earth.
So, the earth leakage current of the supply depends on the length and the type of the cables used.
Indeed, there are not looped with the supply because of this high impedance to earth.

2) To know the EMC level in case of IT supply, it is necessary to add a specific measurement test filter (RSIL filter) which allows to fix the characteristics of the supply seen by the ATV. The level measured in this case corresponds to only the configurations of the supply which are NOT those from the customer.

1) En régime IT, il y a une forte impédance entre le neutre du transformateur et la terre.
Donc, les courants de fuite à la terre de l'alimentation dépendent de la longueur et du type de câble utilisé.
En effet, ils ne se rebouclent pas par l'alimentation à cause de cette forte impédance de terre au transformateur.

2) Pour connaître les niveaux CEM en régime IT, il faut ajouter dans l'alimentation un filtre spécifique à ce type d'essais (filtre d'essais CEM -> RSIL) qui permet alors de maîtriser les caractéristiques de l'alimentation de test.
Les niveaux CEM obtenus sont donc valables pour des caractéristiques particulières qui ne sont évidement pas celles du client.


Legacy KB System (APS) Data: RESL176088 V1.0, Originally authored by on , Last Edited by on
Related ranges: Other VVD PRODUCTS

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