Section 12 Control
12.1 Synchrocheck, energizing check, and synchronizing
SESRSYN
IP14558-1 v4
12.1.1 Identification
M14889-1 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Synchrocheck, energizing check, and
synchronizing
SESRSYN
SYMBOL-M V1 EN-US
25
12.1.2 Application
IP15111-1 v1
12.1.2.1 Synchronizing
SEMOD171992-5 v9
To allow closing of breakers between asynchronous networks, a synchronizing feature is
provided. The breaker close command is issued at the optimum time when conditions across
the breaker are satisfied in order to avoid stress on the network and its components.
The systems are defined as asynchronous when the frequency difference between bus and line
is larger than an adjustable parameter. If the frequency difference is less than this threshold
value the system is defined to have a parallel circuit and the synchrocheck function is used.
The synchronizing function measures the difference between the U-Line and the U-Bus. It
operates and enables a closing command to the circuit breaker when the calculated closing
angle is equal to the measured phase angle and the following conditions are simultaneously
fulfilled:
• The voltages U-Line and U-Bus are higher than the set values for
UHighBusSynch
and
UHighLineSynch
of the respective base voltages
GblBaseSelBus
and
GblBaseSelLine
.
• The difference in the voltage is smaller than the set value of
UDiffSynch
.
• The difference in frequency is less than the set value of
FreqDiffMax
and larger than the
set value of
FreqDiffMin
. If the frequency is less than
FreqDiffMin
the synchrocheck is
used and the value of
FreqDiffMin
must thus be identical to the value
FreqDiffM
resp
FreqDiffA
for synchrocheck function. The bus and line frequencies must also be within a
range of ±5 Hz from the rated frequency. When the synchronizing option is included also
for autoreclose there is no reason to have different frequency setting for the manual and
automatic reclosing and the frequency difference values for synchronism check should be
kept low.
• The frequency rate of change is less than set value for both U-Bus and U-Line.
• The difference in the phase angle is smaller than the set value of
CloseAngleMax
.
• The closing angle is decided by the calculation of slip frequency and required pre-closing
time.
1MRK 505 370-UEN D Section 12
Control
Busbar protection REB670 249
Application manual
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