ABB REL650 Applications Manual page 105

1MRK 506 334-UUS A
Protected Object
A B
INS
a)
b)
INS
ANSI11000029 V3 EN
Figure 41: Connections for single-phase CT input
Application manual
C
1
(+)
(-)
(+)
(-)
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 41:
CT prim = 1000 A
CT sec = 1A
CTWyePoint = ToObject
For connection (b) shown in figure 41:
CT prim = 1000 A
CT sec = 1A
CTWyePoint = 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
accordingly.
IED
2
(+)
(-)
Section 4
Analog inputs
4
SMAI_20_2
BLOCK
REVROT
^GRP2_A
^GRP2_B
^GRP2_C
^GRP2_N
3
ANSI11000029-3-en.vsd
DFTReference shall be set
AI3P
AI1
AI2
AI3
AI4
AIN
99