SynchroCheck
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
Fuse fail
Fuse fail
Line voltage
Line
reference
voltage
Bus voltage
IEC10000079-2-en.vsd
IEC10000079 V2 EN-US
Figure 122: Principle for the synchrocheck function
12.1.2.3 Energizing check
M12310-3 v12
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
123 shows two substations, where one (1) is energized and
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).
1 2
A
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
Line voltageBus voltage
IEC10000078-4-en.vsd
B
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.
Section 12 1MRK 505 370-UEN D
Control
252 Busbar protection REB670
Application manual
To Next Page
Loading...
