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LRG - What factors and configurations could go wrong?

LRG - What factors and configurations could go wrong?

LRG - What factors and configurations could go wrong?

(OP)
we have a situation where equipment fed from the secondary of a 132-13.2Y/7.62kV, 40MVA delta-wye(grounded) transformer with secondary LRG (400A) got damaged.

Equipment damaged include

1- A transfomer connceted delta wye(solidly grounded) which was fed from the secondary of the above mentioned transformer.

2- PTS connected in a similar fashion as #2.

I was not involved in the process and don't know much detail. Just wanted to get an idea, since I have a curious nature.

Could anyone explain why?
    

RE: LRG - What factors and configurations could go wrong?

Quote:

Could anyone explain why?

Probably not without at least some information on what was damaged and the type of damage.

My first guess is that it was struck by a meteor.

 

"The perfect is the enemy of the good." -- Voltaire

RE: LRG - What factors and configurations could go wrong?

(OP)
dpc I apologize if I sounded stupid. My comment was mostly towards delta/wye configuration.

I highly respect your opinion and have learned tremendously from your posts, no matter how harsh they are at times :)

My questions is:
Is it ok to connect delta-wye(grounded) transformer on the secondary side of a detla-wye(low resistance grounded) transformer?

Yes or No?
 

RE: LRG - What factors and configurations could go wrong?

(OP)
I don't think it's an issue, but want to be certain that it doesn't create any grounding issues.

RE: LRG - What factors and configurations could go wrong?

It shouldn't be a problem, and is done all the time.  The main limitation of the resistance grounded system is that it does not support single-phase (line-neutral) loads.  The three-phase delta presented by the transformer primary is not a concern.  

What type of damage occurred?

 

"The perfect is the enemy of the good." -- Voltaire

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