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NVA100X-D - Manual - 02 - 2016
FUNCTION CHARACTERISTICS
MCB VT OPEN
MCB VT2 OPEN
The external acquisition of MCB auxiliary contact allows to detect a failure on the secondary circuit
of the voltage transformer (VTs); the information is available for the VT monitoring function (74VT).
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 and 67N protections) that may operate inadvertently when an event cause
a loss of one or more voltages.
Reset demand measures
The input activation make a reset of all demand measures.
Reset energy
The input activation make a reset of all energy measures.
I(L)>Bk (Logic block of I> ele-
ment)
The input activation make a block of the I>, side L element through virtual I/O.
I(L)>>Bk (Logic block of I>> ele-
ment)
The input activation make a block of the I>, side L element through virtual I/O.
xBk (Logic block of Ix element)
The input activation make a block of the xx element through virtual I/O:
I(L)>>>Bk
I(H)>Bk
I(H)>>Bk
I(H)>>>Bk
IE1>Bk
IE1>>Bk
IE1>>>Bk
IE2>Bk
IE2>>Bk
IE2>>>Bk
IEC>Bk
IEC>>Bk
IEC>>>Bk
IED>Bk
IED>>Bk
IED>>>Bk
IED>>>>Bk
IEDC>Bk
IEDC>>Bk
IEDC>>>Bk
IEDC>>>>Bk
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MCB-open.ai
Binary input allocation for state acquisition of the MCB auxiliary contact
VT Monitoring (74VT)
Binary input INx
T0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T0
n.o.
n.c.
INx
t
OFF
UAUX
UAUX
INx
MCB VT OPEN
VT
LINE
MCB
TO VOLTAGE INPUTS
MCB-open.ai
Binary input allocation for state acquisition of the MCB auxiliary contact
VT Monitoring (74VT)
Binary input INx
T0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T0
n.o.
n.c.
INx
t
OFF
UAUX
UAUX
INx
MCB VT OPEN
VT
LINE
MCB
TO VOLTAGE INPUTS
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