Siemens siprotec 7SA522 User Manual

3.1 Mounting and Connections
373
7SA522 Manual
C53000-G1176-C155-3
Voltages Connection examples for current and voltage transformer circuits are provided in Ap-
pendix A.3.
For normal connection the 4th voltage measuring input is not used. Correspondingly,
the following setting must be made in address  8WUDQVIRUPHU = 1RW
FRQQHFWHG. Nevertheless, the factor in address 8SK8GHOWD must be set to
 (this factor is used internally for the conversion of measured and fault recording
values).
For additional connection of an e-n-winding of a set of voltage transformers, address
 must be set to 8WUDQVIRUPHU = 8GHOWDWUDQVI. The factor address 
8SK8GHOWD depends on the transformation ratio of the e–n-winding. Instructions
- see Section 2.1.3.1 at “Voltage Transformer Connection”.
In further connection examples also the e–n winding of a set of voltage transformers
is connected, in this case, however of a central set of transformers at a busbar. For
more information refer to the previous paragraph. Observe that 2-CT-connection is
permitted only for isolated or compensated networks.
Further figures show examples for the additional connection of a different voltage, in
this case the busbar voltage (e.g. for the voltage protection or synchronism check). For
voltage protection address  8WUDQVIRUPHU = 8[WUDQVIRUPHU must be set,
for the synchronism check 8WUDQVIRUPHU = 8V\QFWUDQVI. The factor address
 8OLQH8V\QF is unequal to , only if the feeder side VT and busbar side VT
have a different transformation ratio. The factor in address  8SK8GHOWD must
however be set to  (this factor is used internally for the conversion of measured
and fault recording values).
If there is a power transformer between the set of busbar and the feeder VT's, the
phase displacement of the voltages caused by the transformer must be considered for
the synchronism check (if used). In this case, also check the addresses  8V\QF
FRQQHFW,  ϕ8V\QF8OLQH and  8OLQH8V\QF. You will find detailed
hints and an example in Section 2.1.3.1 under “Voltage Transformer Connection”.
Binary Inputs and
Outputs
The connections to the system depend on the possible allocation of the binary inputs
and outputs, i.e. how they are assigned to the system. The presettings of the device
are listed in Tables A.4 in the Appendix. Check also that the labelings on the front cor-
respond to the allocated indication functions.
Changing Setting
Groups with Binary
Inputs
If binary inputs are used to change setting groups, please observe the following:
• To enable the control of 4 possible setting groups 2 binary inputs have to be avail-
able. One binary input must be set for ´!6HW*URXS%LWµ, the other input for
´!6HW*URXS%LWµ. If either of these input functions is not assigned, then it is
considered as not controlled.
• To control two setting groups, one binary input set for ´!6HW*URXS%LWµ is suf-
ficient since the binary input ´!6HW*URXS%LWµ, which is not assigned, is con-
sidered to be not controlled.
• The status of the signals controlling the binary inputs to activate a particular setting
group must remain constant as long as that particular group is to remain active.
The following Table shows the relationship between binary inputs and the setting
groups A to D. Principal connection diagrams for the two binary inputs are illustrated
in the following Figure 3-1. The Figure illustrates an example in which both Set Group
Bits 0 and 1 are configured to be controlled (actuated) when the associated binary
input is energized (high).

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English