Another alternative is to have the delta connected CT set as shown in figure
L1
IL
1
IL
2
IL
3
L2
L3
Protected Object
IED
C
T
800
/1
in
D
e
lta
D
A
C
C
o
n
n
e
ct
e
d
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
AI N
1
IEC11000028 V3 EN-US
Figure 17: 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 v7
Figure
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 505 343-UEN B
Analog inputs
72
Application manual
Summary of Contents for Relion 670 series
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