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What does LV-side, Phase 2 internally grounded" mean?

What does LV-side, Phase 2 internally grounded" mean?

What does LV-side, Phase 2 internally grounded" mean?

(OP)
Hi all,

I am using digsilent and it provides a check box titled "LV-side, phase 2 internally grounded" when I create a single phase Y-D two winding transformer.

What does it mean to have a delta winding that is "phase 2 internally grounded"?

thanks heaps.

RE: What does LV-side, Phase 2 internally grounded" mean?

How can you have a single-phase Y-D transformer?  

RE: What does LV-side, Phase 2 internally grounded" mean?

(OP)
I know it sounds strange.  But, digsilent allows me to do it!  I wasn't trying to create a Y-D single phase transformer.  But, I clicked those options by mistake and then that check box suddenly appeared.  So I thought I'd ask to find out if anyone knows what it is for.

Could it be an option when three single phase banks are used to create a three phase transformer bank?

RE: What does LV-side, Phase 2 internally grounded" mean?

 
In North American parlance, it sounds similar to a “corner-grounded delta” system, where it is not possible to disconnect the grounding jumper from winding to transformer frame.

      
    

RE: What does LV-side, Phase 2 internally grounded" mean?

(OP)
So does that mean a corner-grounded delta system is three single phase transformers connected so that one winding (e.g. LV winding) is delta connected?  But, where each single phase unit has a permanent grounding jumper between the LV winding and the frame?

RE: What does LV-side, Phase 2 internally grounded" mean?

Yes if it was three-phase xfmr, it would make sense, per busbar's example of corner-ground.  I've never seen one internally grounded, but I guess it's possible.  

480V wye-connected secondaries in three-phase units often have the neutral internally grounded.  

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