Energizing Check - ABB RELION 670 SERIES Applications Manual

1MRK 506 369-UUS -
15.1.2.3
Line distance protection REL670 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
Figure 299: 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
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
300 shows two substations, where one (1) is
Section 15
Control
52
Line
reference
voltage
ANSI10000079-2-en.vsd
637