Energizing Check - ABB REC670 Applications Manual

1MRK 511 401-UUS A
14.1.2.3
Bay control REC670 2.2 ANSI
Application manual
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 105: Principle for the synchronism check function

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
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).
Bus voltage
Fuse fail
Line Bus Voltage
Fuse fail Line Voltage
106 shows two substations,
Section 14
Control
52
Line
reference
voltage
ANSI10000079-2-en.vsd
M12310-3 v12
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