ABB Network Partner AB
Synchronism and energizing
check for single circuit breaker
with voltage selection
Version 1.0-00
1MRK 580 152-XEN
Page 5 - 10
The voltage circuits are arranged differently depending on the number of
synchro-check functions that are included in the control terminal.
In terminals intended for one bay the U-line voltage reference phase is
selected on the man-machine interface (MMI). The reference voltage can
be single-phase L1, L2, L3 or phase-phase L1-L2, L2-L3, L3-L1. The U-
bus voltage must then be connected to the same phase or phases as are
chosen on the MMI. Fig. 2 shows the voltage connection.
In terminals intended for several bays, all voltage inputs are single phase
circuits. The voltage can be selected for single phase or phase-to-phase
measurement on the MMI. All voltage inputs must be connected to the
same phase or phases.
The circuit breaker can be closed when the conditions for FreqDiff,
PhaseDiff, and UDiff are fulfilled with the UHigh condition.
Fig. 2 Connection of the synchro-check function for one bay
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