Cross Tie Feeders - Interlocks & Protections
Cross Tie Feeders - Interlocks & Protections
(OP)
What interlocks/inter-trips, and precautions must be implemented with cross tie feeders?


INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Contact USThanks. We have received your request and will respond promptly. Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting Guidelines |
Cross Tie Feeders - Interlocks & Protections
|
Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.
Here's Why Members Love Eng-Tips Forums:
Register now while it's still free!
Already a member? Close this window and log in.
RE: Cross Tie Feeders - Interlocks & Protections
RE: Cross Tie Feeders - Interlocks & Protections
Sort of depends on your application, and other details.
RE: Cross Tie Feeders - Interlocks & Protections
In such a case, it is always recommended to keep the CB of the tie feeder closed on one side, with the other side (CB) left open. This is to ensure that the tie feeder is live / healthy.
The protection relays may be given a second group of settings (assuming numerical type protection relays) that are sensitive to isolate the feeder in case it develops a fault when live but not connected at one end. The protection group switching can be automatic based on the CB/DS status.
Connecting the cross-tie at both ends should only be permitted when one of the main incomers + Bus secion breaker is open or when both the main incomers are open with bus section closed. This is to ensure that the fault levels at either of the switchgear are not exceeded beyond permissible levels.
Trust the above helps.
RE: Cross Tie Feeders - Interlocks & Protections
Switchgear A feeds switchgear B through cross tie CB(A) during normal operations.
Switchgear B only supplies switchgear A through cross tie CB (B) if the power flow to switchgear A (both sources) fails.