Energizing Check - ABB REC650 Applications Manual

Section 10
Control
10.1.2.3
186
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
V-Bus > 80 % of
GblBaseSelBus
V-Line > 80 % of
GblBaseSelLine
VDiffSC < 0.02 – 0.50 p.u.
PhaseDiffM < 5 - 90 degrees
PhaseDiffA < 5 - 90 degrees
FreqDiffM < 3 - 1000 mHz
FreqDiffA < 3 - 1000 mHz
ANSI10000195 V2 EN
Figure 70: 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. Power system 2 is energized (DLLB) from
substation 1 via the circuit breaker A.
Bus voltage
Fuse fail
Line voltage
Fuse fail
ANSI10000195-2-en.vsd
71 shows two substations, where one (1) is
1MRK 511 286-UUS A
Line
reference
voltage
Application manual