ABB Relion 650 Series Applications Manual page 48

Section 4
Analog inputs
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
Figure 12
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.
A B
CT 600/5
Star Connected
Protected Object
ANSI13000002 V2 EN-US
Figure 12: Wye connected three-phase CT set with wye point towards the protected object
Where:
1)
2)
Table continues on next page
42
gives an example about the wiring of a wye connected three-phase CT set to the IED. It
For correct terminal designations, see the connection diagrams valid for the
delivered IED.
C
I_A
I_B
I_C
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.
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
• 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.
© Copyright 2013 ABB. All rights reserved
IED
1
2
3
figure
1MRK 505 287-UUS B
4
SMAI_20
ANSI3000002-2-en.vsd
12.
Busbar protection REB650
Application manual
SEMOD55055-352 v6.1.1