Main-Tie-Main Arrangement with Tie Breaker Normally Closed
Main-Tie-Main Arrangement with Tie Breaker Normally Closed
(OP)
1. What protections would be required in a Main - Tie - Main arrangement with the Tie in the "closed" position in normal conditions?
2. How should the coordination between the Main and Tie Breakers be handled?
2. How should the coordination between the Main and Tie Breakers be handled?
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
I’ll see your silver lining and raise you two black clouds. - Protection Operations
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
Adding two CTs one on either side of bus tie breaker and paralleling the CT signal with that of the incomer will help avoid this additional time. The arrangement sums up the current from the incomer as well as the tie that is coming in to the subject bus section while timing the Overcurrent protection. The protection trips the subject incomer as well as the bus tie breakers.
You can find more details of the scheme in IEEE 242 (Buff book)
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
I’ll see your silver lining and raise you two black clouds. - Protection Operations
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
I’ll see your silver lining and raise you two black clouds. - Protection Operations
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
I’ll see your silver lining and raise you two black clouds. - Protection Operations
RE: Main-Tie-Main Arrangement with Tie Breaker Normally Closed
I only recently learned of the bare bones method. One our older stations cleared the entire low side bus via both mains when a feeder breaker failed to open. The lack of protection zones ended up requiring inspection of both sections of bus before any restoration could occur.