With External Control
As another option, the synchrocheck function can be activated via external measurement requests via binary
inputs. If the start is effected via the pulse start signal
>25 Start
, the corresponding stop signal
>25 Stop
must always be generated, too. Having completed the check, the synchrocheck function issues the release
message (see the following figure). Measurement is terminated as soon as the measurement request is reset
via the binary input. In this case, there is no need to configure a control device to be synchronized.
[zusam-wirk-synchro-fkt-mit-ext-anst-061115, 1, en_US]
Figure 2-116 Interaction of synchrocheck function and external control
Setting Notes
General
The synchronization function can only operate if 25 Function 1 with SYNCHROCHECK was enabled at
address 161 during configuration of the functional scope (see Section 2.1.1.2 Setting Notes). If this function is
not required, then Disabled is set.
While setting the Power System Data 1 (see Section Voltage Connection (Power System), Page 40) the device
was already provided with data relevant for the measured values and the operating principle of the synchroni-
zation function. This concerns the following parameters:
202 Vnom PRIMARY primary nominal voltage of the voltage transformers V
1
(phase-to-phase) in kV;
203 Vnom SECONDARY secondary nominal voltage of the voltage transformers V
1
phase-to-phase) in V;
213 VT Connect. 3ph specifies how the voltage transformers are connected.
When using the synchronization function the setting Vab, Vbc, VSyn is used if two phase-to-phase
voltages are open delta-connected to the device. You can use any phase-to-phase voltage as the reference
voltage V
SYN
Use the setting Vph-g, VSyn if only phase-to-ground voltages are available. One of these voltages is
connected to the first voltage transformer; the reference voltage V
SYN
is connected to the third voltage trans-
former. V
1
at the first voltage transformer and V
2
at the third voltage transformer must belong to the same
voltage type (VAN or VBN or VCN).
Connection examples are given under side heading “Voltage Connections” and in the Appendix C Connection
Examples).
If you have set Vab, Vbc, VSyn or Vph-g, VSyn, the zero sequence voltage can not be determined. The
functions “Directional Ground Fault Detection”, “Directional Time Overcurrent Protection Ground” and “Fuse
Failure Monitor (FFM)” are disabled in this case. Table 2-1 in the Section provides information about the
consequences of the different voltage connection types.
The operating range of the synchronization function (f
Nom
± 3 Hz) refers to the nominal frequency of the
power system, address 214 Rated Frequency.
The corresponding messages of the SYNC function group are pre-allocated for IEC 60870–5–103 (VDEW).
Selecting the SYNC function group in DIGSI opens a dialog box with tabs in which the individual parameters
for synchronization can be set.
General Settings
The general thresholds for the synchronizing function are set at addresses 6101 to 6112.
2.20.6
Functions
2.20 Synchrocheck
SIPROTEC 4, 7SJ80, Manual 267
E50417-G1140-C343-A8, Edition 12.2017
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