Technical description
2 Protection functions
2.22 Arc fault protection
(50ARC/50NARC)-optional
VM50.EN004
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Binary input
The binary input (BI) on the arc option card (see chapter 8.5)
can be used to get the light indication from another relay to
build selective arc protection systems. The BI signal can also be
connected to any of the output relays, BO, indicators etc.
offered by the output matrix (See chapter 5.4). BI is a dry input
for 48 Vdc signal from binary outputs of other VAMP relays or
dedicated arc protection devices by VAMP.
Binary output
The binary output (BO) on the arc option card (see chapter 8.5)
can be used to give the light indication signal or any other
signal or signals to another relay's binary input to build
selective arc protection systems. Selection of the BO connected
signal(s) is done with the output matrix (See chapter 5.4). BO is
an internally wetted 48 Vdc signal for BI of other VAMP relays
or dedicated arc protection devices by VAMP.
Delayed light indication signal
There is a delayed light indication output signal available for
building selective arc protection systems. Any light source
combination and a delay can be configured. The resulting
signal is available in the output matrix to be connected to BO,
output relays etc.
Pick up scaling
The per unit (pu) values for pick up setting are based on the
current transformer values.
ArcI>:
1 pu = 1xI
N
= rated phase current CT value
ArcI
01
>:
1 pu = 1xI
01N
= rated residual current CT value for input I
01
.
Parameters of arc protection stages ArcI>, ArcI
01
>
(50ARC/50NARC)
Parameter Value Unit Description
Note
Status -
Start
Trip
Current status of the stage
Light detected according ArcIn
Light and overcurrent detected
F
F
LCntr
Cumulative light indication
counter. S1, S2 or BI.
C
SCntr
Cumulative light indication
counter for the selected inputs
according parameter ArcIn
C
TCntr
Cumulative trip counter
C
Force Off
On
Force flag for status forcing for
test purposes. This is a common
flag for all stages and output
relays, too. Automatically reset
by a 5-minute timeout.
Set