2.23 Arc fault protection
(50ARC/50NARC)- optional
2 Protection functions
Technical description
128
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VM259.EN007
Binary input
The binary input (BI) on the arc option card (see chapter 8.4)
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 devices or
dedicated arc protection devices by VAMP.
Binary output
The binary output (BO) on the arc option card (see chapters 8.4
and 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
devices or dedicated arc protection devices by VAMP.
Delayed light indication signal
Relay output matrix has a delayed light indication output
signal (Delayed Arc L>) available for building selective arc
protection systems. Any light source combination and a delay
can be configured starting from 0.01 s to 0.15 s. 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
0
>:
1 pu = 1xI
0n
= rated residual current CT value for
input I
01
.