Date Code 990215 Trip and Target Logic 5-21
SEL-351P Manual Técnico
In three-terminal line DCUB applications (setting ECOMM = DCUB2), UBB1 or UBB2 disable
tripping if the loss-of-channel condition (for the respective Channel 1 or 2) continues for longer
than time UBDURD.
The UBB1 and UBB2 are routed in various combinations in
Figure SECTION 5: .11 to control
Relay Word bit UBB, depending on enable setting ECOMM = DCUB1 or DCUB2. Relay Word
bit UBB is the unblock block input into the trip logic in
Figure SECTION 5: .1. When UBB
asserts to logical 1, tripping is blocked.
To Next Page
Loading...