Siemens siprotec SJ62 User Manual page 296

Connections
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
The parameter Balancing V1/V2 (address 6x21) can be set to account for different
VT ratios of the two parts of the power system (see example in Figure 2-105).
If a transformer is located between the system parts to be synchronized, its vector
group can be accounted for by angle adjustment so that no external adjusting mea-
sures are required. Parameter ANGLE ADJUSTM. (address 6x22A) is used to this end.
The phase angle from V
Example: (see also Figure 2-105):
Busbar
Feeder
Transformer
The transformer vector group is defined from the high side to the low side. In the ex-
ample, the reference voltage transformers (V
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 2-105 Busbar voltage measured accross transformer
7SJ64 provides three voltage inputs for the connection of voltage V
input for voltage V (see Figure 2-106 and Figure 2-105). According to definition, the
2
three-phase voltage is the reference voltage V
V with voltage V correctly, the connection type of voltage V
1 2
device. Address CONNECTIONof V2 assumes this task (parameter 6x23).
If three phase-to-ground voltages are connected to side V
phase-to-ground voltage can be used and configured as voltage to be synchronized
V . If two phase-phase voltages are connected in V-connection to side V
2
2.19 Synchronism and Voltage Check 25 (7SJ64 only)
to V is evaluated positively.
1 2
400 kV primary; 110 V secondary
220 kV primary; 100 V secondary
400 kV/220 kV; vector group Dy(n)5
) are the ones of the transformer high
1
1
and one voltage
1
. To compare the three-phase voltage
must be signalled to the
2
, then any phase-phase or
1
, then the
1
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