ABB REL670 2.2 IEC, Applications Manual

Page: 88 / 908

For correct terminal designations, see the connection diagrams
valid for the delivered IED.
Protected Object
L1 L2 L3
IED
IN
P
INS
INS
2
IEC11000029-4-en.vsdx
4
3
C
T
1000
/1
a)
b)
(+)
(+)
(-)
(-)
(+)
(-)
1
SMAI2
BLOCK
REVROT
^GRP2L1
^GRP2L2
^GRP2L3
^GRP2N AI3P
AI1
AI2
AI3
AI4
AI N
IEC11000029 V4 EN-US
Figure 18: Connections for single-phase CT input
Where:
1) shows how to connect single-phase CT input in the IED.
2) is TRM where these current inputs are located. It shall be noted that for all these
current inputs the following setting values shall be entered.
For connection (a) shown in Fgure 18 :
CTprim= 1000 A
CTsec= 1A
CTStarPoint=ToObject
For connection (b) shown in Figure 18 :
CTprim= 1000 A
CTsec= 1A
CTStarPoint=FromObject
3) shows the connection made in SMT tool, which connect this CT input to the fourth input
channel of the preprocessing function block 4).
4) is a Preprocessing block that has the task to digitally filter the connected analog inputs
and calculate values. The calculated values are then available for all built-in protection
and control functions within the IED, which are connected to this preprocessing
function block.
If frequency tracking and compensation is required (this feature is typically required
only for IEDs installed in the power plants) then the setting parameters DFTReference
shall be set accordingly.
Section 4
1MRK 506 369-UEN B
Analog inputs
82 Line distance protection REL670 2.2 IEC
Application manual