Grounding of a Un-grounded System
Grounding of a Un-grounded System
(OP)
We have a 6600 V System, which is un-grounded. This system is fed by two 220/6.6 kV Transformers, which have delta connected secondary.
Now we want to ground this system through a zig zag transformer.
how do I size the zig zag transformer and what protections shall be provided to this transformer.
Thanks
Now we want to ground this system through a zig zag transformer.
how do I size the zig zag transformer and what protections shall be provided to this transformer.
Thanks






RE: Grounding of a Un-grounded System
but just make sure i wont diconeect it self on a fault
i had a customer how put the zigzag thoug a breaker
on the first falt the breaker opened to clear the FALT
no good lol
for protection you don't really protect the transformer you protect the device, so you should put some earth fault relay were neccessary
RE: Grounding of a Un-grounded System
RE: Grounding of a Un-grounded System
http://www
http://cuky2000.250free.com/Zigzag_Data.gif
RE: Grounding of a Un-grounded System
Usually the zig zag is protected by a breaker or fuse, and has a Ct on the earth leg to allow connection to an earth protection relay.
RE: Grounding of a Un-grounded System
http://www.i-gard.com/
You should find everything you need there
RE: Grounding of a Un-grounded System