A
I
A
I
B
I
C
B C
Protected Object
IED
C
T
8
0
0
/
1
i
n
D
e
l
t
a
D
C
A
C
o
n
n
e
c
t
e
d
IC-IB
IB-IA
IA-IC
2
3
4
ANSI11000028-2-en.vsd
SMAI_20
ANSI11000028 V2 EN
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
• CTWyePoint=ToObject
• ConnectionType=Ph-Ph
It is important to notice the references in SMAI. As inputs at Ph-Ph are expected to be A-
B, B-Crespectively C-A we need to tilt 180º by setting ToObject.
4.2.2.7 Example how to connect single-phase CT to the IED
Figure 18 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.
Section 4 1MRK 506 369-UUS -
Analog inputs
82 Line distance protection REL670 2.2 ANSI
Application manual
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