Protected Object
CT 600/5
Wye Connected
IED
ANSI13000002-3-en.vsd
1
2
3
4
SMAI_20
A
I_A
I_B
I_C
B C
I_A
I_B
I_C
ANSI13000002 V3 EN
Figure 13: 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 13.
•
CTprim=600A
•
CTsec=5A
•
CTStarPoint=ToObject
Ratio of the first two parameters is only used inside the IED. 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
1MRK 506 369-UUS - Section 4
Analog inputs
Line distance protection REL670 2.2 ANSI 75
Application manual
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