VAMP 221
Arc protection system
Technical description
VAMP Ltd
6
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VM221.EN013
2.
Functions
2.1.
Protection functions
The arc protection functions of the arc protection relay are
always operational. You can select the circuit breaker failure
protection stage using the programming switches.
2.1.1.
Arc (fault) protection (50AR)
Arc protection involves the central unit, I/O units, a range of
light sensitive elements and a instantaneous overcurrent stage
module. The module can be connected to 1, 2 or 3-phase current
or earth-fault current and 2-phase current.
Arc protection is operational when the light I/O unit transfers
the light information from the arc sensor to the system and,
simultaneously, overcurrent stage of the I/O unit status. These
signals are visible in all system components, each of which
generates an arc fault trip according to its own settings. The
system or a system component can also be programmed to
operate on light information alone.
The operating time of the arc protection stage is 7 ms.
Arc protection setting parameters:
VAMP 221
Parameter
Parameter
Parameter
Parameter
Value
Value
Value
Value
Unit
Unit
Unit
Unit Default
Default
Default
Default Description
Description
Description
Description
SW1-2
ON/OFF
OFF
Settings for arc fault trip
criteria:
OFF: tripping based on light
and current criteria
ON: tripping based on light
criteria
SW1-5 … 7 ON/OFF
Trip relay matrix for protection
zones
L1 / L3
0.8 … 6
pu
1.0
Current criteria setting value
for current channels L1 and L2
L2 / Io
0.05 … 5
pu
1.0
Current criteria setting value
for current channel L2/Io
