SynchroCheck
Fuse fail
Fuse fail
Line voltage
Line
reference
voltage
Bus voltage
.
U-Bus > 80 % of GblBaseSelBus
U-Line > 80 % of GblBaseSelLine
UDiffSC < 0.02 – 0.50 p.u.
PhaseDiffM < 5 - 90 degrees
PhaseDiffA < 5 - 90 degrees
FreqDiffM < 3 - 1000 mHz
FreqDiffA < 3 - 1000 mHz
IEC08000021_2_en.vsd
IEC08000021 V2 EN
Figure 80: Principle for the synchrocheck function
10.1.2.3 Energizing check
The main purpose of the energizing check function is to facilitate the controlled re-
connection of disconnected lines and buses to energized 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 81 shows two substations,
where one (1) is energized and the other (2) is not energized. Power system 2 is
energized (DLLB) from substation 1 via the circuit breaker A.
Section 10 1MRK 505 291-UEN A
Control
186
Application manual
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