Example How To Connect Single-Phase Ct To The Ied - ABB REL650 Applications Manual

Section 4
Analog inputs
A B
CT 800/1
Star Connected
Protected Object
ANSI11000026 V4 EN
Figure 40: Wye connected three-phase CT set with its star point away from the protected object
4.2.3.5
98
C
IC
IB
IA
In the example in figure 40
described example (figure
CTStarPoint of the used current inputs on the TRM (item 2 in the figure):
• CTprim=600A
• CTsec=5A
• CTWyePoint=FromObject
Inside the IED only the ratio of the first two parameters is used. The third parameter as set
in this example will negate the measured currents in order to ensure that the currents are
measured towards the protected object within the IED.

Example how to connect single-phase CT to the IED

Figure 41 gives an example how to connect the single-phase CT to the IED. It gives an
overview of the required actions by the user in order 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.
IED
2
3
1
case everything is done in a similar way as in the above
39). The only difference is the setting of the parameter
1MRK 506 334-UUS A
4
SMAI_20_2
BLOCK AI3P
REVROT AI1
5
^GRP2L1 AI2
^GRP2L2 AI3
^GRP2L3 AI4
^GRP2N AIN
ANSI11000026-4-en.vsd
Application manual