CHARACTERISTICS
31
NV10B - Manual - 04 - 2022
52a-52b
The CB position can be acquired by means of binary inputs connected to the auxiliary contacts: the
information is used in the following functions:
• CB position (open-closed)
• CB diagnostic (N. of operations, trip time)
• Breaker Failure (BF).
Open CB
Close CB
The external acquisition of remote commands allows to drive CB remotely.
Remote trip
The input activation drives an expressly programmed output relay..
74TV ext
The external acquisition of 74TV allows to block or to change the operating mode of protective el-
ements where the residual voltage is employed; the information is available for residual voltage
protective elements (59N protections) that may operate inadvertently when an event cause a loss of
one or more voltages.
CB-pos.ai
CB position
CB diagnostic
Breaker failure (BF)
52a
52
52b
+UAUX
-UAUX
IN-
IN+
52a
IN-
IN+
52b
Binary input IN1
T 0
IN1
t
ON
T0
n.o.
n.c.
IN1 tON
Logic
IN1 tOFF
IN1
t
OFF
Binary input IN2
T 0
IN2
t
ON
T0
n.o.
n.c.
IN2 tON
Logic
IN2 tOFF
IN2
t
OFF
Binary input allocation for CB state acquisition
CB-com.ai
OPEN
command
CLOSE
command
+UAUX
+UAUX
-UAUX
IN-
IN+
Open CB
IN-
IN+
Binary input IN1
T 0
IN1
t
ON
T0
n.o.
n.c.
IN1 tON
Logic
Close CB
IN1 tOFF
IN1
t
OFF
Binary input IN2
T 0
IN2
t
ON
T0
n.o.
n.c.
IN2 tON
Logic
IN2 tOFF
IN2
t
OFF
Binary input allocation for CB remote driving
TRIPPING MATRIX
(LED+RELAYS)
-UAUX
-UAUX
52a
52
O
I
52b
Remote-trip.ai
Remote trip
+UAUX
-UAUX
Remote trip
Binary input IN1, IN2
T 0
IN1
t
ON
T0
n.o.
n.c.
IN1 tON
Logic
IN1 tOFF
IN1
t
OFF
TRIPPING MATRIX
(LED+RELAYS)
Binary input allocation for remote trip
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