Siemens 7SC80 Manual page 344

Functions
2.20 Synchrocheck
The phase angle from V1 to V2 is evaluated positively.
Example:
Busbar
Feeder
Transformer
The transformer vector group is defined from the high side to the low side. In the example, the reference
voltage transformers (V1) are the ones of the transformer high side, i.e. the setting angle is 5 x 30° (according
to vector group), that is 150°:
Address 6122 ANGLE ADJUSTM. = 150°.
The reference voltage transformers supply 100 V secondary for primary operation at nominal value while the
feeder transformer supplies 110 V secondary. Therefore, this difference must be balanced:
Address 6121 Balancing V1/V2 = 100 V/110 V = 0.91.
[anschluss-u1-und-u2-7sc80, 1, en_US]
Figure 2-116
Connections
To compare the reference voltage V
about the connection type of voltage V
In some special cases of 6 PT mode, when the voltage connected to VX/V2A is not available in the parameter
6123, you can set 6123 to other voltages, but the amplitude and angle correction is necessary. For example, if
the parameter 213 is set to Vab, Vbc, and the parameter 219 is set to V2an,V2bn,V2cn, the option A-G is
not available in the parameter 6123. In this case, you can set the parameter 6123 to A-B. At the same time,
the parameter 6121 must be set to 1.73 and the parameter 6122 to 30°, so as to compensate the amplitude
and angle correction.
For the internal conversion to primary values, the primary rated transformer voltage of measurand V
entered via parameter 6125 VT Vn2, primary if a transformer is located between the system parts to be
synchronized.
344
400 kV primary; 100 V secondary
220 kV primary; 110 V secondary
400 kV/220 kV; vector group Dy(n)5
Connection of V1 and V2 to the Device, Example
correctly with the additional voltage V
1
via parameter 6123 CONNECTIONof V2.
2
, the device must be informed
2
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
must be
2