Siemens siprotec 7SA6 User Manual

Installation and Commissioning
8-97SA6 Manual
C53000-G1176-C156-2
8.1.2 Termination variants
Outline diagrams are shown in Appendix A, Section A.2. Connection examples for cur-
rent and voltage transformer circuits are provided in Appendix A, Section A.3. It must
be checked that the setting configuration of the
Power System Data 1 (P.System
Data 1)
corresponds with the connections to the device.
Currents The Figures A-31 to A-39 show examples of the current transformer connection op-
tions.
For the normal connection according to Figure A-31 address
220 must be set to I4
transformer
= In prot. line, and furthermore address 221 must be set to I4/
Iph CT
= 1.000.
For the connection as shown in Figures A-32 to A-35 the setting of address
220 must
also be
I4 transformer = In prot. line.Thefactor221 I4/Iph CT may de-
viate from 1. For notes on how to calculate the factor, refer to Subsection 6.1.1 under
“Current Transformer Connection”. Remember that the 2-CT-connection according to
Figure A-34 or A-35 is permitted only in isolated or compensated systems.
In Figures A-36 and A-37, examples of the connection of the earth current of a parallel
line are shown (for parallel line compensation). In address
220 I4 transformer the
setting option
In paral. line must be set. The factor 221 I4/Iph CT may deviate
from 1. For notes on how to calculate the factor, refer to Subsection 6.1.1.
In Figures A-38 and A-39, examples of the connection of the earth current of a source
transformer are shown. In address
220 I4 transformer the setting option IY
starpoint
must be set. Notes regarding the factor 221 I4/Iph CT may again be
foundinSubsection6.1.1.
Voltages The Figures A-40 to A-47 show examples of the voltage transformer connection op-
tions.
For the normal connection as shown in Figure A-40 the 4th voltage measuring input
U
4
is not used. Correspondingly the address 210 must be set to U4 transformer =
Not connected. The factor in address 211 Uph / Udelta must, however, be set
to
1.73 (this factor is used internally for the conversion of measurement and fault re-
cording values).
Figure A-41 shows an example of the additional connection of an open-delta winding
of the set of voltage transformers. Address
210 must in this case be set to U4 trans-
former
= Udelta transf..The factor in address 211 Uph / Udelta is depend-
ent on the ratio of the open-delta winding. Notes may be referred to in Subsection
6.1.1 under “Voltage Transformer Connection”.
Also Figures A-42 to A-45 show examples of a connection of the open-delta winding
of a set of voltage transformers, in this cases, however, of a central set of transformers
at a busbar. The same considerations apply as stated in to the previous paragraph.
Remember that the 2-CT-connection according to Figure A-44 or A-45 is permitted
only for use on isolated or compensated systems.
Figures A-46 and A-47 show examples of the connection of a different voltage, in this
case the busbar voltage (e.g. for overvoltage protection). For overvoltage protection
address
210 must be set to U4 transformer = Ux transformer. The factor ad-
dress
215 U-line / Usync is always equal to 1 unless the feederside VT and bus-
barside VT have a different transformation ratio. The factor in address
211 Uph /
Udelta
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