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Current
Transformer
Connection
7SA6 Manual
C53000-G1176-C156-2
Address 215:
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-46 or A-47:
Address 210 is then set: U4 transformer = Ux transformer.
It is assumed, that the Ux transformer ratio is equal to the phase voltage transform-
er ratio.
• If the U
input is not required, the following setting is applied:
4
Address 210 U4 transformer = Not connected.
Also in this case the factor Uph / Udelta (Address 211, refer to the above) is of
importance, as it is utilised for the scaling of the measurement and disturbance re-
cording 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, Fig-
ure A-31):
Address 220 is then set to: I4 transformer = In prot. line and
Address 221 to I4/Iph CT = 1.
• Connection of the I
4
feeder (e.g. a summation CT or window-type current transformer, refer to Appendix
A, e.g. Figures A-32 to A-35).
Address 220 is then set to: I4 transformer = In prot. line and
Address 221 is set to I4/Iph CT:
U-line / Usync = 100 V/ 110 V = 0.91
(any voltage)
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
sync
U4 transformer = Usync transf.
Usync connect = L1–L3
ϕ Upp-Uline = 210°
U-line / Usync = 0,91
, which may be processed
X
may be utilised
4
Functions
6-9
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