Functions
2.18 Synchronism and Voltage Check (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
352
Figure 2-171 Synchro check logic
Operating modes
The closing check for automatic reclosing is possible in one of the following operating modes:
AR SYNC-CHECK Released at synchronism, that is when the critical values AR
maxVolt.Diff, AR maxFreq.Diff, AR maxAngleDiff are within the
set limits.
AR Usy1<Usy2> Released if measuring point Usy1< is de-energised and the measuring point
Usy2> is energised.
AR Usy1>Usy2< Released if measuring point Usy1> is energised and the measuring point
Usy2< is de-energised.
AR Usy1<Usy2< Released if measuring point Usy1< is de-energised and the measuring point
Usy2< is also de-energised.
AR OVERRIDE Released without any check.
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