Multiple Synchronizing Points; Operating Range/Measured Values - Siemens SIPROTEC 4 7VE61 Manual

Functions
2.2 Paralleling Functions
During privatisation of the device (indication
reasons.
All these indications lead to a stopping and resetting of the synchronising function.
A summary of all monitorings is given in Section
2.2.1.5

Multiple Synchronizing Points

Depending on the scope of delivery (see
parameters are deposited here for each circuit breaker being synchronised, in so-called synchronising function
groups. In the maximum variant the 7VE63 operates up to 8 synchronising points. Selection uses either binary
inputs or the serial interface.
Table 2-2
Device
14. Order No position
Number of Sync function groups
However, several synchronizing functional groups may be used for one synchronizer/switching object if
synchronization is to be performed with different parameters. Allocation of switchgear component and SYNC
function group must then be accomplished dynamically (whichever is the function group to operate with) via
one of the binary inputs from
If the assignment to the SYNC function groups is clear, the binary inputs are not required.
Selecting one SYNC function group several times, causes output of an error indication (
Synchronization of Power Units
On synchronizing large power units it is recommended in principle that one parallel switching device (7VE63)
is used per unit. This results in two typical synchronizing points: The generator circuit breaker or the power
system circuit breaker.
The paralleling device is connected to the voltage transformer or the circuit breaker via external auxiliary
relays. On selecting the synchronizing point the measured values are connected and connection to the circuit
breaker being synchronised results. This starts the synchronizing procedure. In principle the device also allows
a test synchronising. In addition to the start input (indication
synchronising (indication
The logic functionality (CFC) allows also the parallel switch device to undertake activation of the switchover
relays. The corresponding logic must be provided for this in accordance with application. This method has
advantages for activation of the parallel switched device via the serial interface.
2.2.1.6

Operating Range/Measured values

Operating Range
The operating range of the synchronizing function is defined by the configured voltage limits Umin and Umax,
and the fixed frequency band f
If measurement is started and one or both voltages are outside the operating range, or one voltage leaves the
permissible range, corresponding messages indicate this behaviour (
U1>> , Sync. U1<< , etc.).
Measured Values
The measured values of the synchrocheck are displayed in separate boxes for primary and secondary meas-
ured values and percentages. The measured values are displayed and updated only while a synchrocheck is
requested.
The following is displayed:
•
Value of reference voltage U1
•
Value of the voltage to be synchronized U2
42
Table
Maximum number of synchronising function groups
7VE61*
A
3
>Sy1 activ to >Sy8 wirks .
>COM Test sync. ) has to be pressed.
± 3 Hz.
N
Level-2 change ) synchronisation is not permitted for safety
2.12 Supervision.
2-2) multiple synchronising points can be operated. The setting
7VE63*
B or C D A
2 4 3
>Sync Start ) the commissioning input for test
Sync. f1>> , Sync. f1<< , Sync.
B or C D
2 8
Sync FG-Error ).
SIPROTEC 4, 7VE61 and 7VE63, Manual
C53000-G1176-C163-3, Edition 10.2017