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Section 12
Control
UHighBusSC > 50 - 120 % of GblBaseSelBus
UHighLineSC > 50 - 120 % of GblBaseSelLine
UDiffSC < 0.02 – 0.50 p.u.
PhaseDiffM < 5 - 90 degrees
PhaseDiffA < 5 - 90 degrees
FreqDiffM < 3 - 1000 mHz
FreqDiffA < 3 - 1000 mHz
IEC10000079 V2 EN-US
Figure 122: Principle for the synchrocheck function
12.1.2.3
Energizing check
The main purpose of the energizing check function is to facilitate the controlled re-connection
of disconnected lines and buses to energized buses and lines.
The energizing check function measures the bus and line voltages and compares them to both
high and low threshold values. The output is given only when the actual measured conditions
match the set conditions. Figure
the other (2) is not energized. The line between CB A and CB B is energized (DLLB) from
substation 1 via the circuit breaker A and energization of station 2 is done by CB B energization
check device for that breaker DBLL. (or Both).
IEC10000078 V4 EN-US
Figure 123: Principle for the energizing check function
The energizing operation can operate in the dead line live bus (DLLB) direction, dead bus live
line (DBLL) direction, or in both directions over the circuit breaker. Energizing from different
directions can be different for automatic reclosing and manual closing of the circuit breaker.
252
SynchroCheck
123
1
A
Bus voltage
EnergizingCheck
UHighBusEnerg > 50 - 120 % of GblBaseSelBus
UHighLineEnerg > 50 - 120 % of GblBaseSelLine
ULowBusEnerg < 10 - 80 % of GblBaseSelBus
ULowLineEnerg < 10 - 80 % of GblBaseSelLine
UMaxEnerg < 50 - 180 % of GblBaseSelBus and/or
GblBaseSelLine
Bus voltage
Fuse fail
Line voltage
Fuse fail
shows two substations, where one (1) is energized and
2
B
Line voltage
1MRK 505 370-UEN D
Line
reference
voltage
IEC10000079-2-en.vsd
IEC10000078-4-en.vsd
Busbar protection REB670
Application manual
M12310-3 v12
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