ABB Relion 670 Series Applications Manual page 272

Section 12
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 124: Principle for the synchronism check 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
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 125: Principle for the energizing check function
266
125 shows two substations, where one (1) is energized and the other (2) is not
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
© 2017 - 2021 Hitachi Power Grids. All rights reserved
Bus voltage
Fuse fail
Line Bus Voltage
Fuse fail Line Voltage
2
B
Line voltage
1MRK 505 370-UUS Rev. K
52
Line
reference
voltage
ANSI10000079-2-en.vsd
ANSI10000078-4-en.vsd
Busbar protection REB670
Application manual
M12310-3 v12