Siemens siprotec 7SA6 User Manual

Installation and Commissioning
8-97SA6 Manual
C53000-G1176-C133-1
8.1.2 Termination variants
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
36\VWHP'DWD corresponds with the connections to the device.
Currents 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.
Voltages 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
U
4
is not used. Correspondingly the address  must be set to 8WUDQVIRUPHU
= 1RWFRQQH FWHG.The factor in address  8SK8GHOW D 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WUDQVIThe 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
 8OLQH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).

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English