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2.19 Synchronism and Voltage Check 25 (7SJ64 only)
292
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
2.19.1.8 Setting Notes
General The synchrocheck function is only included in the 7SJ64 relay with its four voltage
inputs.
While 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
synchrocheck 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
is more than one voltage transformer at the primary side.
When using the synchronization function, setting
Van,Vbn,Vcn,VSy
must always be
selected independent of whether there are phase-ground or phase-phase voltages at
the primary side. Two phase-phase voltages are V-connected to the device (see also
connection examples for 7SJ64 in the AppendixA.3). However, a zero sequence
voltage cannot be determined in that case. The functions „Directional Time Overcur-
rent Protection Ground“, „Directional Ground Fault Detection“ and „Fuse-Failure-
Monitor (FFM)“ must be disabled.
240 VT Connect. 1ph
specifies the voltage connected at side V
1
if only one voltage
transformer is available at the primary side. If the parameter is set different from
NO
,
setting of address
213
is no more relevant. 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 synchrocheck refers to the
nominal frequency of the power system (f
Nom
±
3 Hz);
The synchrocheck 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 asyn-
chronous conditions.
SYNCHROCHECK
corresponds to the classic synchrocheck func-
tion. If not required, this function is set to
Disabled
. A synchrocheck function group
thus rendered ineffective is disabled in the menu item Synchronization ; other groups
in this menu 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.
Selecting one of the displayed SYNC function groups in DIGSI opens a dialog box with
the tabs "General", "Power System Data", "asyn. operation", "syn. operation" and
"Synchrocheck" in which the individual settings for synchronism can be made. For
SYNC function group x the following holds:
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 synchronizing func-
tion group x
ON
or
OFF
. If switched off, the synchronous check does not verify the syn-
chronization conditions and release is not granted.