question

brmurray avatar image

Ungrounded Neutral in 3-phase System

Hello,


I understand from the manuals that Multiplus 3-phase networks must be Wye/Star, not delta. However, I should be able to run 3-phase delta loads from the legs of the star, since the line-line voltage would still be 400V. Such a concept is drawn below.

1610495156236.png

My question is, what to do with the neutrals? They much be connected for the Multis to reference each other, and they are grounded by the ground relay. As drawn, there is nowhere to place an RCD or ground fault interrupter.


What is the best way to power a 400V_LL, three-wire, three-phase load.


MultiPlus Quattro Inverter Charger3 phase
1610495156236.png (25.5 KiB)
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1 Answer
Johannes Boonstra (Victron Energy Staff) avatar image
Johannes Boonstra (Victron Energy Staff) answered ·

Hello, the "unused" Neutral may remain floating, the fact that they will be connected to ground isn't relevant in your setup.

You may however use a 3p RCD if you want if the ground relay is active by the way.


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