•
CTprim
=600A
•
CTsec
=5A
•
CTStarPoint
=FromObject
The ratio of the first two parameters is only used inside the IED. 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.
A third alternative is to have the residual/neutral current from the two-phase CT set
connected to the IED as shown in Figure
L1
IL
1
IL
2
L2
Protected Object
CT 600/5A
Star Connected
IL1
IL2
IN
IED
1
3
4
2
IEC16000138-1-en.vsdx
6
SMAI2
BLOCK
^GRP2L1
^GRP2L2
^GRP2L1L2
^GRP2N
AI2P
AI1
AI2
AI3
AI4
AIN
5
5
IEC16000138 V1 EN-US
Figure 14:
Star connected two-phase CT set with its star point away from the
protected object and the residual/neutral current connected to the
IED
Where:
1)
Shows how to connect two individual phase currents from a star connected two-phase CT
set to the two CT inputs of the IED.
2)
Shows how to connect residual/neutral current from the two-phase CT set to the fourth
input in the IED. It shall be noted that if this connection is not made, the IED will still
calculate this current internally by vectorial summation of the two individual phase
currents.
3)
Is the TRM where these current inputs are located. It shall be noted that for all these
current inputs the following setting values shall be entered.
•
CTprim=600A
•
CTsec=5A
•
CTStarPoint=FromObject
The ratio of the first two parameters is only used inside the IED. The third parameteras 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.
Table continues on next page
Section 4
1MRK 506 375-UEN A
Analog inputs
52
Railway application RER670 2.2 IEC
Application manual
Summary of Contents for RELION RER670
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