Siemens SIPROTEC 7SJ62 User Manual

Functions
2.19 Synchronization Function
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
316
Example: (see also Figure 2-121):
Busbar 400 kV primary; 110 V secondary
Feeder 220 kV primary; 100 V secondary
Transformer 400 kV/220 kV; vector group Dy(n)5
The transformer vector group is defined from the high side to the low side. In the example, the reference voltage
transformers (V
1
) 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 6x22A: 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 6x21:Balancing V1/V2 = 100 V/110 V = 0.91.
Figure 2-121 Busbar voltage measured accross transformer
Connections
For connection of voltage V
1
there are three voltage inputs and for voltage V
2
there is one voltage input avail-
able (see Figure 2-122 and also example in Figure 2-121). According to definition, the three-phase voltage is
the reference voltage V
1
. To compare the three-phase voltage V
1
with voltage V
2
correctly, the connection type
of voltage V
2
must be signaled to the device. Address CONNECTIONof V2 assumes this task (parameter 6x23).
If three phase-to-ground voltages are connected to side V
1
, any phase-to-phase or phase-to-ground voltage
can be used and configured as synchronized voltage V
2
. If two phase-to-phase voltages are connected in V-
connection to side V
1
, then the voltage V
2
to be synchronized must be a phase-to-phase voltage. It must be
connected and configured.
Single-phase connection is also possible for side V
1
. In address 240 VT Connect. 1ph this information must
be communicated to the device (see above). Setting of address 213 is not relevant in that case. Compared to
voltage of side 1 the voltage to be synchronized must be equal in type and phase. Address 6x23
CONNECTIONof V2 is hidden for single-phase connection. An example of the single-phase connection to a
device can be found in Figure 2-123.
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Siemens SIPROTEC 7SJ62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ62
Category	Relays
Language	English