VAMP Ltd Arc protection system
User manual
VAMP 220 / 220R
VM220.EN004 Vamp 24h support phone : +358 (0)40 573 6316
9
The tripping of the arc protection system can be backed up by
employing the built-in circuit breaker failure protection
subunit. This unit trips another breaker, for instance, the
upstream circuit breaker, in case the main circuit breaker
should fail to operate. Thus, it gives the system redundancy
and increased security.
The master unit includes a unidirectional arc input, a
unidirectional current dependent arc output, and a bi-
directional arc in/output. Furthermore, the master unit is
equipped with a unidirectional overcurrent output and a bi-
directional overcurrent in/output. With these properties a
selective arc protection can be built even in complex
distribution systems.
Any voltage within the range 40 - 265 V ac or dc (or optionally
18 - 36 V dc) can be used as auxiliary supply voltage for the
master unit. All internal supply voltages required by the
system are derived from the auxiliary supply voltage of the
master unit.
NOTE!
It is recommended that the auxiliary voltage is fed from a
secured source, which is unaffected by a possible arc fault.
2.1.2. Functional description
The current inputs of the three-phase overcurrent subunit
(220) or two-phase overcurrent and E/F subunits (220R) are
connected in series with any other possible protective devices of
the switchgear. The start value of the overcurrent (220) /
overcurrent + E/F (220R) subunits are set according to the
preconditions determined by the arc short circuit and/or E/F
current (220R) , independently of the settings of any other
protection systems within the switchgear. The start value is set
with a potentiometer knob on the control panel of the master
unit (220). VAMP 220R has a separate E/F setting.
The arc protection unit obtains its measuring signals from the
slave units, to which the arc sensors of the system are
connected. The unit starts when one or more of the system's
arc sensors are activated.
At a simultaneous activation of the overcurrent unit (220) /
overcurrent or/and E/F unit (220R) and the arc protection unit,
the arc protection system operates and the output elements trip
the circuit-breakers.
NOTE!
No operation takes place if only one unit (either the
overcurrent or arc protection unit) is activated.