Micom P634 - Selection of the Residual Current to be Monitored; Forming a Virtual Transformer End

3.12.4 Selection of the Residual Current to be Monitored
For protection functions of the P634 monitoring the residual current, the user can
select whether the device is to use the current derived from the three phase
currents or the current measured at the fourth current transformer; see also
Fig. 3-39, (p. 3-64).
1
1: Calculated
2: Measured
MAIN:
Evaluation IN, end a
[ 016 096 ]
2
1
1: Calculated
2: Measured
MAIN:
Evaluation IN, end b
[ 016 097 ]
2
1
1: Calculated
2: Measured
MAIN:
Evaluation IN, end c
[ 016 098 ]
2
1
2
1 2
c1
c2
1
2
1 2
c1
c2
1
2
1 2
c1
c2
64Z8022A
IN,b
IN,a
IN,c
IA,b
IB,b
IC,b
IY,b
ΣIP,b
IA,a
IB,a
IC,a
IY,a
ΣIP,a
IA,c
IB,c
IC,c
IY,c
ΣIP,c
Fig. 3-43: Evaluation of residual current
3.12.5 Forming a Virtual Transformer End
The P634 offers the option of forming a new variable by combining the phase
currents or the residual currents from two or three ends of the transformer.
P634
3 Operation
3-72 P634/EN M/R-42-A // P634‑311‑653