ABB REQ650 User Manual

Protected Object
L1 L2 L3
IED
INP
INS
INS
2
IEC11000029-4-en.vsdx
4
3
CT 1000/1
a)
b)
(+)
(+)
(-)
(-)
(+)
(-)
1
SMAI2
BLOCK
REVROT
^GRP2L1
^GRP2L2
^GRP2L3
^GRP2N
AI3P
AI1
AI2
AI3
AI4
AIN
IEC11000029 V4 EN
Figure 28: 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 figure 28:
CT prim = 1000 A
CT sec = 1A
CTStarPoint = ToObject
For connection (b) shown in figure
28:
CT prim = 1000 A
CT sec = 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 505 291-UEN A
Analog inputs
70
Application manual

ABB REQ650 Specifications

General

Brand	ABB
Model	REQ650
Category	Protection Device
Language	English