ABB REL670 2.2 IEC, Applications Manual

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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 v8
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.
1MRK 506 369-UEN B
Section 4
Analog inputs
Line distance protection REL670 2.2 IEC 81
Application manual