Deif Multi-line 2 - Page 33

AGC Designer’s Reference Handbook
DEIF A/S Page 33 of 168
GB close sequence
Start
is GB open
No
Start seq OK
Yes
No
DG freq match
BB freq
time runout
No
direct closing
OK
close GB
Yes
alarm sync
failure
Yes
GB closed alarm
No
end
Yes
single DG
application
Yes
voltage on
busbar
No
island mode
Yes
voltage on bus
Yes
MB close
No
Yes Yes
All GBs OFF
No
TB Present
Yes
TB open
Yes
MB open
No
Sync GB
No
Yes
No
Yes
No
Yes
No
No
No