Basler Electric DGC-2020HD - Manual (Page 99)

9469300990 Rev B 89
breaker will close. These diagrams consider breaker status, bus voltage stability, and synchronization
conditions. Command Agreement and Dead Bus Close Arbitration conditions are omitted for clarity.
Figure 43 illustrates generator breaker closure conditions for the generator breaker control configuration.
Refer to Figure 32 or Figure 33, for a diagram of a generator breaker control configuration. Figure 44
shows generator breaker closure conditions in a generator and mains breaker control configuration. Refer
to Figure 35 for a diagram of this configuration.
Generator Breaker Control Configuration
Before the generator breaker can be closed, Generator Breaker Control must be selected. If the generator
breaker is already closed, the DGC-2020HD still attempts to close the breaker. It is assumed that since
the breaker is already closed, the closure conditions have already been met.
When the generator breaker is open, user settings are read to determine the states of the generator bus
and load bus. If the generator bus is stable and the load bus is stable, the generator bus is synchronized
with the load bus and the generator breaker attempts to close. If the generator bus is stable, the load bus
is dead, and the Dead Bus Close Enable setting is enabled, the generator breaker attempts to close. If
the generator bus is dead, the load bus is dead, the Dead Gen Close Enable, and the Dead Bus Close
Enable settings are both enabled, then the generator breaker attempts to close.
DGC-2020HD Breaker Management