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Figure 2-3
• Connection of the U
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 measurement inputs, three of which are connected to the set of current trans-
formers. 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 core balance CT):
Address 220 is then set to: I4 transformer = In prot. line and address 221 I4/Iph CT is set:
This is independent of whether the device has a normal measuring current input for I
suring current input (if necessary with I
All current transformers in the device must be set to the same secondary current (Jumpers).
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Busbar voltage measured via transformer
input to any other voltage 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 protection
X
:
4
transformer for earth fault protection).
E
Functions
2.1 General
or a sensitive mea-
4
47
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