ABB REC650 - Examples on How to Connect, Configure and Set CT Inputs for most Commonly Used CT Connections

ANSI11000021-2-en.vsd
Transformer
protection
Transformer
Line
Setting of current input:
Set parameter
CT_WyePoint with
Transformer as
reference object.
Correct setting is
"ToObject"
ForwardReverse
Definition of direction for
directional functions
Line protection
Setting of current input:
Set parameter
CT_WyePoint with
Transformer as
reference object.
Correct setting is
"FromObject"
Setting of current input:
Set parameter
CT_WyePoint with
Line as
reference object.
Correct setting is
"ToObject"
IED
IED
ANSI11000021 V2 EN
Figure 17: Example how to set CT_WyePoint parameters in the IED
This example is similar to example 1, but the power transformer is feeding just one line;
both line protection IED and transformer protection IED use the same CT. The CT
direction is set with different reference objects for the two IEDs though it is the same
current from the same CT that is feeding the two IEDs. With these settings the directional
functions of the line protection shall be set to Forward to look towards the line.
4.2.3.3 Examples on how to connect, configure and set CT inputs for most
commonly used CT connections
Figure
18 defines the marking of current transformer terminals commonly used around the
world:
In the SMAI function block, you have to set if the SMAI block is
measuring current or voltage. This is done with the parameter:
AnalogInputType: Current/voltage. The ConnectionType: phase -phase/
phase-earth and GlobalBaseSel.
Section 4 1MRK 511 286-UUS A
Analog inputs
66
Application manual