4–354 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL CHAPTER 4: SETPOINTS
Bus Transfer
The Transfer scheme is intended for application to a set of three circuit breakers on a
Main-Tie-Main arrangement, two of which (Incomers 1 and 2) connect sources of electrical
energy to two busses which could be paralleled through the Bus Tie breaker. The normal
system configuration is with both incoming breakers closed and the bus tie breaker open.
The transfer scheme implemented in the 850
relay is known as Open Transfer, with an
“Open-before-Close” operation sequence. This means that the faulty incomer is removed
from service before the tie breaker is closed.
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