Siemens Siprotec 7VK61 Manual page 91

Notes on the Information List
The most important information of the device is briefly explained in so far as it cannot be interpreted in the fol-
lowing information lists or described in detail in the foregoing text.
„>Sync. Start MC" (No. 2905)
Binary input which enables direct initiation of the synchronism check with setting parameters for manual close.
This initiation with setting parameter for manual close has always precedence if binary inputs „>Sync. Start
MC" (No. 2905) and „>Sync. Start AR" (No. 2906, see below) are activated at the same time.
„>Sync. Start AR" (No 2906)
Measuring request from an external automatic reclosure device. The parameters of synchronism check set for
automatic reclosure are valid here.
„Sync. req.CNTRL" (No 2936)
Measurement request of the control function; this request is evaluated on event-triggered basis and only gen-
erated if the control issues a measurement request.
„Sync. release" (No 2951)
Release signal to an external automatic reclosure device.
Connections
The 7VK61 provides three voltage inputs for connection of the reference voltage U
the voltage U
sy2
phase-to-earth voltages are always connected for U
to-phase) are allowed for the single-phase connection of U
synchronized. If the connections U
Usy1 is to be set to adjust the angle.
Connection, multiple-phase
If the phase-to-earth voltages are connected to all three phases, parameter 106 is set to VT CONNECTION =
3phase during configuration. The following figure shows a connection example. In this example, the phase-to-
earth voltage U
lected for parameter 212 so that corresponding voltages will be compared.
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
to be synchronized (see example in Figure 2-19). If the connection is to all three phases, the
and U
sy1
is the voltage to be synchronized. Accordingly, Usy2 connection = L1-E must be se-
L1–E
2.4 Synchronism and voltage check (optional)
whereas all connection types (phase-to-earth, phase-
sy1
. The latter holds also for the voltage U
sy1
differ with regard to the phase angle, parameter 214 ϕ Usy2-
sy2
Functions
and one voltage input for
sy1
to be
sy2
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