ABB RED650 Applications Manual page 60

Section 4
Analog inputs
54
For correct terminal designations, see the connection diagrams
valid for the delivered IED.
Protected Object
L1 L2 L3
INS
a)
b)
INS
IEC11000029 V4 EN-US
Figure 15: 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 15:
CTprim = 1000 A
CTsec = 1A
CTStarPoint = ToObject
For connection (b) shown in Figure 15:
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
shall be set accordingly.
IED
2
1
(+)
(+)
(-)
(+)
(-)
(-)
Line differential protection RED650 2.2 IEC
1MRK 505 393-UEN B
4
SMAI2
BLOCK AI3P
REVROT AI1
^GRP2L1 AI2
^GRP2L2 AI3
^GRP2L3 AI4
^GRP2N AIN
3
IEC11000029-4-en.vsdx
DFTReference
Application manual