Transformer Grounding

You've got a short somewhere. You'll have to have it lengthened.

Lyn, maybe there is no possibilty of short because our main breaker that was in OFF position is located right after the transformer secondary. Thanks for your comment.

delta-connected/ corner grounded and bonded to the primary windings...
Can you plz explain the above terms.

Our utility company have a standard of grounding the neutral of star connected primary to earth while the secondary delta connected has no neutral but one of its corner between two windings is grounded to earth. Then from this transformer a main breaker is installed to to protect the secondary windings. But we notice that even this main breaker was in OFF position a line to ground voltage registered in the three lines to the ground. Is this normal to this type of system?

delta-connected/ corner grounded and bonded to the primary windings

Have you a diagram? Sounds like a good setup for a ground fault.

Sir, the diagram of WAREAGLE below is the set-up of our system. Hope it is in order!

Sir your are correct there was no voltage reading between line C and ground. If there will be readings FOR THE OTHER 2 LINES TO GROUND, any solution to the problem? I alraedy ask the assistance of the utility technicians to check the connection of their distribution transformers and to find out why their installed lightning arresters often busted even during summers.

Thanks for a bright idea. Sir we were alarmed to this condition because everytime we did a PMS to the motors our electricians cannot touch the motor without using an insulated gloves though our main breaker from the secondary windings was in the OFF position. I will try to use an incandecent bulb to connect it to the line to ground if it will light as you suggested.