Another alternative is to have the delta connected CT set as shown in figure 24:
L1
IL1
IL2
IL3
L2 L3
Protected Object
IED
CT 800/1
in Delta
DAC Connected
IL3-IL2
IL2-IL1
IL1-IL3
2
3
4
IEC11000028-3-en.vsdx
SMAI2
BLOCK
REVROT
^GRP2L1
^GRP2L2
^GRP2L3
^GRP2N
AI3P
AI1
AI2
AI3
AI4
AIN
1
IEC11000028 V3 EN-US
Figure 24: Delta DAC connected three-phase CT set
In this case, everything is done in a similar way as in the above described example, except that
for all used current inputs on the TRM the following setting parameters shall be entered:
CT
prim
=800A
CT
sec
=1A
•
CTStarPoint
=ToObject
•
ConnectionType
=
Ph-Ph
It is important to notice the references in SMAI. As inputs at
Ph-Ph
are expected to be L1L2,
L2L3 respectively L3L1 we need to tilt 180º by setting
ToObject
.
4.2.2.7 Example how to connect single-phase CT to the IED
SEMOD55055-431 v8
Figure
25 gives an example how to connect the single-phase CT to the IED. It gives an overview
of the required actions by the user in order to make this measurement available to the built-in
protection and control functions within the IED as well.
For correct terminal designations, see the connection diagrams valid for the
delivered IED.
Section 4 1MRK 505 370-UEN D
Analog inputs
72 Busbar protection REB670
Application manual
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