Termination Variants - Siemens siprotec 7SA6 User Manual

8.1.2

Termination variants

Currents
Voltages
7SA6 Manual
C53000-G1176-C133-1
Outline diagrams are shown in Appendix A, Section A.2. Connection examples for
current and voltage transformer circuits are provided in Appendix A, Section A.3. It
must be checked that the setting configuration of the 3RZHU 6\VWHP 'DWD 
36\VWHP 'DWD  corresponds with the connections to the device.
The Figures A-20 to A-23 show examples of the current transformer connection
options.
For the normal connection according to Figure A-20 address  must be set to ,
WUDQVIRUPHU = ,Q SURW OLQH, and furthermore address  must be set to ,
,SK &7 = .
For the connection as shown in Figure A-21 the setting of address  must also be
, WUDQVIRUPHU = ,Q SURW OLQH. The factor  ,,SK &7 may deviate
from 1. For notes on how to calculate the factor, refer to Subsection 6.1.1 under
"Current Transformer Connection".
In Figure A-22 an example of the connection of the earth current of a parallel line is
shown (for parallel line compensation). In address  , WUDQVIRUPHU the
setting option ,Q SDUDO OLQH must be set. The factor  ,,SK &7 may
deviate from 1. For notes on how to calculate the factor, refer to Subsection 6.1.1.
In Figure A-23 an example of the connection of the earth current of a source
transformer is shown. In address  , WUDQVIRUPHU the setting option ,<
VWDUSRLQW must be set. Notes regarding the factor  ,,SK &7 may again be
found in Subsection 6.1.1.
The Figures A-24 to A-27 show examples of the voltage transformer connection
options.
For the normal connection as shown in Figure A-24 the 4th voltage measuring input
is not used. Correspondingly the address  must be set to 8 WUDQVIRUPHU
U
4
= 1RW FRQQHFWHG.The factor in address  8SK  8GHOWD must however be set
to 1.73 (this factor is used internally for the conversion of measurement and fault
recording values).
Figure A-25 shows an example of the additional connection of an e–n winding of the
set of voltage transformers. Address  must in this case be set to 8
WUDQVIRUPHU =8GHOWD WUDQVIThe factor in address  8SK  8GHOWD is
dependent on the ratio of the e–n winding. Notes may be referred to in Subsection
6.1.1 under "Voltage Transformer Connection".
Also Figure A-26 shows an example of a connection of the e–n winding of a set of
voltage transformers, in this case, however of a central set of transformers at a busbar.
For more information refer to the previous paragraph.
Figure A-27 shows an example of the connection of a different voltage, in this case the
busbar voltage (e.g. for overvoltage protection). For overvoltage protection address
 must be set to 8 WUDQVIRUPHU = 8[ WUDQVIRUPHU. The factor address
 8OLQH  8V\QF is always equal to 1 unless the feederside VT and busbarside
VT have a different transformation ratio. The factor in address  8SK  8GHOWD
must be 1.73 (this factor is used internally for the conversion of measurement and fault
recording values).
Installation and Commissioning
8-9