Siemens SIPROTEC 7SJ62 Manual page 306

Functions
2.19 Synchronization Function
Figure 2-117
The synchronization feature of the 7SJ62/64 usually cooperates with the integrated automatic reclosing system
and the control functions of the control function. It is also possible to employ an external automatic reclosing
system. In such a case, signal exchange between the devices is accomplished via binary inputs and outputs.
The configuration decides whether the synchronism check is carried out only for automatic reclosing or only for
circuit breaker control or both. It is also possible to specify different release criteria for automatic close or control
close. Synchronous connection is always accomplished via the integrated control.
The release command for closing under satisfied synchronism conditions can be deactivated by parameter
6x13 25 Synchron. The disabled closing release can, however, be activated via binary input („>25
synchr."). It is intended for special applications (see„de-energized switching").
Connection, Multiple-phase
For comparing the two voltages, the synchronization function uses the reference voltage V
voltage to be connected V
phase-to-ground voltages. The voltage to be synchronized V
may be any phase-to-ground or phase-to-phase voltage.
The device can also be connected in V-connection using two phase-to-phase voltages. In this case, a phase-
to-phase voltage must be connected to the voltage to be synchronized V
in case of a V-connection, zero-sequence voltage cannot be detected. The functions „Directional Overcurrent
Protection Ground", „Directional Ground Fault Detection" and „Fuse Failure Monitor (FFM)" must be either
removed or switched off.
Connection, Single-phase
If there is only one primary voltage to represent the reference voltage V
fact via the Power System Data 1. Also in this case the synchronization function can be fully applied.
306
Bus coupler
. The reference voltage V
2
is derived from the multi-phase system, usually the three
1
is assigned to the single-phase connection and
2
. Furthermore, it should be noted that
2
, the device can be informed of this
1
C53000-G1140-C207-2, Release date 01.2008
and an additional
1
SIPROTEC, 7SJ62/64, Manual