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3-74
Protection Functions
Arc fault protection
(50ARC/50NARC)
(optional)
857-UM001A-EN-P – July 2009
Recorded values of the latest eight faults
Detailed information is available on the eight latest faults: Time
stamp, fault value and elapsed delay.
Table 3.46 – Recorded Values of the Programmable Stages PrgN (99)
Parameter
Value
yyyy-mm-dd
hh:mm:ss.ms
Flt
EDly
SetGrp
1
2
NOTE: This protection function needs optional hardware in slot X6.
More details of the hardware can be found under "Optional Two-
Channel Arc Protection Card" in Chapter 9 and "Arc Protection
Interface (option)" in Chapter 10.
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-earth arc faults. Current input
01
I
01
•
ArcI
>
for phase-to-earth arc faults. Current input
02
I
02
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.
Unit
Description
Time stamp of the recording, date
Time stamp, time of day
pu
Fault value
%
Elapsed time of the operating time setting.
100% = trip
Active setting group during fault
is used.
is used.
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