BUS TRANSFER Switch AUTO (guarded position) –
- BTBs operate automatically to maintain power to AC Transfer Busses
from any operating generator or extemal power
- DC Cross Tie Relay avtomatically provides normal or isolated
operation as required.
OFF – Isolates AC Transfer Bus 1 from AC Transfer Bus 2 if one
IDG is supplying power to both AC Transfer Busses
- DC Cross Tie Relay opens to isolate DC Bus 1 from DC Bus 2.
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