Current
Transformer
Connection
7SA6 Manual
C53000-G1176-C133-1
this difference must also be considered:
Address :
(any voltage)
Yd5
400 kV/220 kV
220 kV/100 V
feeder
220 kV
Figure 6-9
Busbar voltage, measured across a power transformer
• Connection of the U
4
by the overvoltage protection function, refer to Appendix A, Figure A-27:
Address is then set: 8 WUDQVIRUPHU = 8[ WUDQVIRUPHU.
It is assumed, that the Ux transformer ratio is equal to the phase voltage
transformer ratio.
• If the U
input is not required, the following setting is applied:
4
Address 8 WUDQVIRUPHU = 1RW FRQQHFWHG.
Also in this case the factor 8SK 8GHOWD (Address , refer to the above) is
of importance, as it is utilised for the scaling of the measurement and disturbance
recording signals.
The device contains four current measurement inputs, three of which are connected
to the set of current transformers. The fourth current measuring input I
in various ways:
• Connection of the I
4
transformers on the protected feeder (normal connection, refer to Appendix A,
Figure A-20):
Address is then set to: , WUDQVIRUPHU = ,Q SURW OLQH and
Address to ,,SK &7 = 1.
• Connection of the I
4
feeder (e.g. a summation CT or cable-type current transformer, refer to Appendix
A, e.g. Figure A-21).
Address is then set to: , WUDQVIRUPHU = ,Q SURW OLQH and
Address is set to ,,SK &7:
8OLQH 8V\QF = 100 V/ 110 V =
U
L1
U
L2
U
L3
U
E
input to any other voltage signal U
input to the earth current in the starpoint of the set of current
input to a separate earth current transformer on the protected
L1
Busbar
L2
400 kV
L3
400 kV
110 V
U
SS
V#ÃU
hs
r
VÃU
hs
r
=
VÃ8PII
G ²G!
=
VVyvr
!
ϕ
=
°
VyvrVÃX9G
(
=
, which may be processed
X
may be utilised
4
Functions
6-9