Functions
2.19 Synchronization Function
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
308
Concerning configuration it is also checked if power system address 213 is set to Van,Vbn,Vcn,VSy. Other-
wise, the message „25 Sync. Error“ is output. Furthermore, specific thresholds and settings of the select-
ed function group are checked. If there is a condition which is not plausible, the error message „25 Set-
Error“ is output additionally. Please ensure in this case that address 6x06 (threshold V1, V2 energized) is
smaller than address 6x03 (lower voltage limit Vmin). The synchronization function cannot be controlled via a
binary input.
If the monitoring function Fuse Failure Monitor is used and if it has picked up at the time as the measurement
of the synchronization was requested, the synchronization is not started either (message „25 Sync.
Error“). The same applies if a voltage transformer failure (m.c.b. tripping) is communicated to the device via
binary input 6509 „>FAIL:FEEDER VT“ or. 6510 „>FAIL: BUS VT“. In this case, the synchronization can
be controlled directly via a binary input.
Operating Range
The operating range of the synchronization function is defined by the configured voltage thresholds Vmin and
Vmax, and the fixed frequency band f
Nom
± 3Hz.
If measurement is started and one or both voltages are outside the operating range, or one voltage leaves the
permissible range, corresponding messages indicate this behavior („25 f1>>“, „25 f1<<“, „25 V1>>“,
„25 V1<<“, etc.).
Measured Values
The measured values of the synchronization function are displayed in separate windows for primary and sec-
ondary measured values and percentages. The measured values are displayed and updated under the follow-
ing conditions:
• when the synchronization function is requested (measurement request)
• as soon as the function group was enabled via the message „>25-1 act“ (170.0001).
Thereby the operation „measurement only“ can be realized, since no measurement request is required and
thus no close command is generated.
The following is displayed:
• Value of reference voltage V
1
• Value of the voltage to be synchronized V
2
• Frequency values f
1
and f
2
• Differences of Voltage, Frequency and Angle.
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