Energizing Check - ABB REB670 Applications Manual

Section 12
Control
12.1.2.3
284
reclosing will take place when the phase angle difference is big and increasing. In this case
it should be safer to close when the phase angle difference is smaller.
To fulfill the above requirements the synchronism check function is provided with
duplicate settings, one for steady (Manual) conditions and one for operation under
disturbed conditions (Auto).
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
Figure 106: 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 lines and buses.
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
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
107 shows two substations, where one (1) is
1MRK 505 337-UUS -
52
Line
reference
voltage
ANSI10000079-2-en.vsd
Application manual