Siemens Siprotec 7VK61 Manual page 32

Functions
2.1 General
Figure 2-3
• Connection of the U
tection function:
Address 210 is then set to: U4 transformer = Ux transformer.
• If the input U
Address 210 U4 transformer = Not connected.
Factor Uph / Udelta (address 211, see above) is also of importance in this case, as it is used for scaling
the measured data and fault recording data.
Current Connection
The device features four current measuring inputs three of which are connected to the set of current transform-
ers. Various possibilities exist for the fourth current input I
• Connection of the I
tected feeder (normal connection):
Address 220 is then set to: I4 transformer = In prot. line and address 221 I4/Iph CT = 1.
• Connection of the I
CT or cable-type CT):
Address 220 is then set to: I4 transformer = In prot. line and address 221 I4/Iph CT is set:
Example:
Phase current transformers 500 A / 5 A
Earth current transformer 60 A / 1 A
32
Busbar voltage measured via transformer
input to any other voltage signal U
4
is not required, set:
4
input to the earth current in the starpoint of the set of current transformers on the pro-
4
input to a separate earth current transformer on the protected feeder (e.g. a summation
4
, which can be processed by the overvoltage pro-
X
:
4
C53000-G1176-C159-3, Release date 05.2009
SIPROTEC, 7VK61, Manual