ABB RED650 Applications Manual

Transformer and
Line protection
Transformer
Line
Setting of current input
for transformer functions:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
ForwardReverse
Definition of direction
for directional
line functions
Setting of current input
for transformer functions:
Set parameter
CTStarPoint with
Transformer as
reference object.
Correct setting is
"ToObject"
Setting of current input
for line functions:
Set parameter
CTStarPoint with
Line as
reference object.
Correct setting is
"FromObject"
IED
IEC05000462 V2 EN-US
Figure 7: Example how to set CTStarPoint parameters in the IED
Figure 8:
For busbar protection, it is possible to set the CTStarPoint parameters in two ways.
The first solution will be to use busbar as a reference object. In that case for all CT
inputs marked with 1 in Figure 8, set CTStarPoint = ToObject, and for all CT
inputs marked with 2 in Figure
8, set CTStarPoint = FromObject.
The second solution will be to use all connected bays as reference objects. In that
case for all CT inputs marked with 1 in Figure 8, set CTStarPoint = FromObject,
and for all CT inputs marked with 2 in Figure 8, set CTStarPoint = ToObject.
Regardless which one of the above two options is selected, busbar differential
protection will behave correctly.
The main CT ratios must also be set. This is done by setting the two parameters
CTsec and CTprim for each current channel. For a 1000/1 A CT, the following
settings shall be used:
• CTprim = 1000 (value in A)
• CTsec =1 (value in A).
Section 4 1MRK 505 393-UEN B
Analog inputs
44 Line differential protection RED650 2.2 IEC
Application manual

ABB RED650 Specifications

General

Brand	ABB
Model	RED650
Category	Protection Device
Language	English