Micom P631, Technical Manual, Page: 118 / 638

3.12 Main Functions of the P631 (Function Group MAIN)
3.12.1 Conditioning of the Measured Values
The secondary phase currents of the system transformers are fed to the P631.
Furthermore, there is the option of connecting a measuring voltage. The
measured values are – electrically isolated – converted to normalized electronics
levels. The analog quantities are digitized and are thus available for further
processing.
The P631 has the following measuring inputs:
●
Current inputs (three phases) for the processing of measured values for 2
winding ends of the transformer.
61Z8001A
A
B
C
a
b
1IA
1IB
1IC
2IA
2IB
2IC
A B C
MAIN:
Inom device, end a
[ 010 024 ]
MAIN:
Conn.meas.circ. IP,a
[ 010 140 ]
MAIN:
Inom device, end b
[ 010 025 ]
MAIN:
Conn.meas.circ. IP,b
[ 010 150 ]
I ̲ A,a
I ̲ B,a
I ̲ C,a
I ̲ A,b
I ̲ B,b
I ̲ C,b
P631
Fig. 3-39: Connection of the measured values to the P631, connection of the fourth current transformer set to the
transformers of the neutral-point-to-ground connections
P631 3 Operation
3-62 P631/EN M/R-11-C // P631-310-650