hi guys,
anybody who can explain me the grouded delata power system?
I have seen one installation in ksa wherein a delta seconondary of a three phase transformer wherein one of the phase leads is connected to ground.
the voltage reading is as ff.
phase A to Grnd = 230
phase B to Grnd = 230
phase C to Grnd = 0

phase to phase

A-B =400
A-C = 230
B-C=230

Grounding one leg of a Delta system is typical and recommended, sometimes called a "corner ground". Grounding one leg will insure that a fuse or circuit breaker will operate in the even of a short.

Delta ungrounded systems are sometimes desired, but need a ground falut detection system to at least indicate the presence of a ground fault that can be repaired at a scheduled time.

It looks like we are having a ground fault in this scheme. Is there any effect on our ground fault protection.
In this kind of connection what is the voltage limitation?

Any voltage can be had depending on the spes of the transformer.

I do not understand your question:

it looks like we are having a ground fault in this scheme. is there any effect on our ground fault protection

What I mean is that the ground fault protection in the primary side of the transformer can sense a fault current if one lead in the secondary is grounded.

No, both sides will each need a GFI sensing relay.A GFI on the Primary will only detect a fault in the windings of the transformer.