ABB Relion 670 Series Applications Manual page 282

Section 14
Control
SynchroCheck
VHighBusSC > 50 – 120% of GblBaseSelBus
VHighLineSC >50 – 120% of GblBaseSelLine
VDiffSC < 0.02 – 0.50 p.u.
PhaseDiffM < 5 – 90 degrees
PhaseDiffA < 5 – 90 degrees
FreqDiffM < 3 – 1000 mHz
FreqDiffA < 1000 mHz
ANSI10000079 V2 EN-US
Figure 110: Principle for the synchronism check function
14.1.2.3 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
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).
ANSI10000078 V4 EN-US
Figure 111: Principle for the energizing check function
276
111 shows two substations, where one (1) is energized and the
1
A
Bus voltage
EnergizingCheck
VLiveBusEnerg > 50 - 120 % of GblBaseSelBus
VLiveLineEnerg > 50 - 120 % of GblBaseSelLine
VDeadBusEnerg < 10 - 80 % of GblBaseSelBus
VDeadLineEnerg < 10 - 80 % of GblBaseSelLine
VMaxEnerg < 50 - 180 % of GblBaseSelBus and/or
GblBaseSelLine
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Bus voltage
Fuse fail
Line Bus Voltage
Fuse fail Line Voltage
2
B
Line voltage
1MRK 511 401-UUS F
52
Line
reference
voltage
ANSI10000079-2-en.vsd
ANSI10000078-4-en.vsd
Bay control REC670
Application manual
M12310-3 v12