Siemens siprotec 7SA522 User Manual

2 Functions
42
7SA522 Manual
C53000-G1176-C155-3
Figure 2-3 Busbar voltage measured via transformer
• Connection of the U
4
- input to any other voltage signal U
X
, which can be processed
by the overvoltage protection function:
Address  is then set to: 8WUDQVIRUPHU = 8[WUDQVIRUPHU.
• If the input U
4
is not required, set:
Address  8WUDQVIRUPHU = 1RWFRQQHFWHG.
Also in this case the factor 8SK8GHOWD (Address , see above) is of impor-
tance, as it is utilised for the scaling of the measurement and disturbance recording
data.
Current Connection The device has four measured current inputs, three of which are connected to the
current transformer set. The fourth current measuring input I
4
may be utilised in
various ways:
• Connection of the I
4
input to the earth current in the starpoint of the set of current
transformers on the protected feeder (normal connection):
Address  is then set to: ,WUDQVIRUPHU = ,QSURWOLQH and address
 ,,SK&7 = 1.
• Connection of the I
4
input to a separate earth current transformer on the protected
feeder (e.g. a summation CT or core balance CT):
Address  is then set to: ,WUDQVIRUPHU = ,QSURWOLQH and address
 ,,SK&7 is set:
This is independent of whether the device has a normal measuring current input for
I
4
or a sensitive measuring current input.

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English