Functions
2.19 Synchronization Function
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
314
2.19.1.8 Setting Notes
General
The synchronization function is available in devices 7SJ64 and 7SJ62. 7SJ64 has four SYNC-function groups,
7SJ62 has one.
When setting the
Power System Data 1
(see Section 2.1.3.2) the device was already provided with data
relevant for the measured values and the operating principle of the synchronization 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
defines the way voltage transformers are connected if there are several voltage trans-
formers at the primary side.
When using the synchronization function, the setting
Van,Vbn,Vcn,VSy
must always be selected regardless
of whether phase-to-ground or phase-to-phase voltages are available at the primary side. Two phase-to-phase
voltages are connected to the device in V-connection (see also the connection examples in AppendixA.3). In
this case, however, a zero-sequence voltage cannot be determined. The functions „Directional Time Overcur-
rent Protection Ground“, „Directional Ground Fault Detection“ and „Fuse Failure Monitor (FFM)“ must be either
removed or switched off.
240
VT Connect. 1ph
specifies the voltage connected at side V
1
if only one voltage transformer is available
at the primary side. If this address is not set to
NO
, the setting of address
213
is not relevant anymore. With
single-phase connection the device generally assumes the voltage at the fourth voltage transformer (V
4
) as the
voltage V
2
to be synchronized.
214
Rated Frequency
the operating range of the synchronizing function refers to the nominal frequency of
the power system (f
Nom
±
3 Hz);
The synchronization function can only operate if at least one of the addresses
161
25 Function 1
to
164
25 Function 4
is set to
Enabled
during configuration of the functional scope (see Section 2.1.1.2). The
operating mode can be preselected:
ASYN/SYNCHRON
means that switching will take place under synchronous
and asynchronous conditions.
SYNCHROCHECK
corresponds to the classic synchrocheck function. If this func-
tion is not required, then
Disabled
is set. A synchronization function group thus rendered ineffective is dis-
abled in the
Synchronization
menu item, all other groups are displayed.
Only the corresponding messages of SYNC Function Group 1 are pre-allocated for IEC 60870–5–103 (VDEW).
If other function groups (2 to 4) are configured and if their messages are to be disposed of via VDEW, they must
first be configured to the system interface.
When selecting one of the displayed SYNC function groups in DIGSI , a dialog box opens with the tabs "", "",
"", "" and "" in which the individual settings for synchronization can be made. For the SYNC function group x
the following applies:
General Settings
The general thresholds for the synchronizing function are set at addresses 6x01 to 6x12.
Address 6x01
Synchronizing
x can be set to switch the entire SYNC function group x
ON
or
OFF
. If switched
off, the synchronous check does not verify the synchronization conditions and release is not granted.
Address 6x02
SyncCB
is used to select the switchgear component to which the synchronizing settings will be
applied. Select the option
none
to use the function as external synchronizing feature. It will then be triggered
via binary input messages.
Addresses 6x03
Vmin
and 6x04
Vmax
set the upper and lower limits for the operating voltage range for V1 or
V2 and thus determine the operating range for the synchronizing function. If the values leave this band, a
message will be output.
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