ABB RELION 650 SERIES, Applications Manual

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The IED fully supports all of these rated secondary values.
4.2.3.4 Example on how to connect a wye connected three-phase CT set to the IED
SEMOD55055-352 v6.1.1
Figure 12 gives an example about the wiring of a wye connected three-phase CT set to the IED. It
gives also an overview of the actions which are needed to make this measurement available to the
built-in protection and control functions within the IED as well.
For correct terminal designations, see the connection diagrams valid for the
delivered IED.
Protected Object
CT 600/5
Star Connected
IED
ANSI3000002-2-en.vsd
1
2
3
4
SMAI_20
A
I_
A
I_
B
I_
C
B C
I_A
I_B
I_C
ANSI13000002 V2 EN-US
Figure 12: Wye connected three-phase CT set with wye point towards the protected object
Where:
1) The drawing shows how to connect three individual phase currents from a wye connected three-phase
CT set to the three CT inputs of the IED.
2) The current inputs are located in the TRM. It shall be noted that for all these current inputs the following
setting values shall be entered for the example shown in figure 12 .
• CTprim=600A
• CTsec=5A
• CTStarPoint=ToObject
Inside the IED only the ratio of the first two parameters is used. The third parameter
(CTStarPoint=ToObject) as set in this example causes no change on the measured currents. In other
words, currents are already measured towards the protected object.
Table continues on next page
Section 4 1MRK 505 287-UUS B
Analog inputs
42 Busbar protection REB650
Application manual
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