
Technical description
2 Protection functions
2.11 Arc fault protection
(50ARC/50NARC) (optional)
VM265.EN011
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75
2.11.
Arc fault protection (50ARC/50NARC)
(optional)
NOTE! This protection function needs optional hardware in slot X6. More details
of the hardware can be found in chapters 8.4 and 9.1.8).
Arc protection is used for fast arc protection. The function is
based on simultaneous light and current measurement. Special
arc sensors are used to measure the light of an arc.
Three stages for arc faults
There are three separate stages for the various current inputs:
ArcI>
for phase-to-phase arc faults. Current inputs
IL1, IL2, IL3 are used.
ArcI‟>
for phase-to-phase arc faults. Current inputs
I‟L1, I‟L2, I‟L3 are used.
ArcI
01
>
for phase-to-earth arc faults. Current input
I
01
is used.
ArcI
02
>
for phase-to-earth arc faults. Current input
I
02
is used.
Light channel selection
The light information source to the stages can be selected from
the following list.
No sensor selected. The stage will not work.
S1
Light sensor S1.
S2
Light sensor S2.
S1/S2
Either one of the light sensors S1 or S2.
BI
Binary input of the arc card. 48 Vdc.
S1/BI
Light sensor S1 or the binary input.
S2/BI
Light sensor S2 or the binary input.
S1/S2/BI
Light sensor S1 or S2 or the binary input.
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 relays or
dedicated arc protection devices by VAMP.
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