VSD contribution to upstream fault

[Gregory_Meunier]

Hi,

I am looking for the fault contribution from Altivar 680 VSD in the context of a short-circuit calculation on a plant network (by IEC 60909 method).

This model is known to have Active Front End, so it may contribute to fault current to the upper network.

My question is related to the short-circuit calculation method given in 6.11 paragraph of IEC60909-0 standard (see attached document).

Reversible static converter are to be modelled as a motor which contribute to short-circuit by an amount of 3 x the rated current.

Is that value suit with the ATV680 ? or should we consider the parameter "AFE Generator Mode" capped at 120 %.

The purpose of the question is to evaluate the total amount of short-circuit current (at 50/60 Hz) when many VSD are installed.

Whether or not this contribution is taken into account, it may lead to underestimate short-circuit current or on contrary to oversize the switchboards.

I am also interested by the the answer for any VSD model. 

[BJacqz · Accepted solution]

Hello Gregory,

As this is a complete and very deep technical question, I would propose that you take contact directly with technical team dedicated to Drives, I would suggest that you create a Bfo case with such question. Our L3 CCC wil then take care of this. If any problem to reach, please let me know