VAMP Ltd
Arc protection system
Technical description
VAMP 221
VM221.EN013
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71
NOTE!
The current measuring channels L1 and L3 must be used in
connection with two-phase current measuring. If only two
phases are connected, they should be connected to L1 and L3.
Single-phase current or earth-fault current must always be
connected to the current measuring channel L2/I
0
; otherwise,
an imbalance error will occur.
NOTE!
The specified operating time of 7ms can only be guaranteed for
three-phase current measurement.
Wiring the trip circuits of the circuit breakers
Connect the circuit breaker’s trip circuits to the following
terminals (a maximum of four separate trip outputs in two
separate groups):
TRIP1:
X1-7, X1-8
(fast, group 1)
TRIP2:
X1-9, X1-10
(fast/CBFP, group 1)
TRIP3:
X1-11, X1-12
(fast, group 2)
TRIP4:
X1-13, X1-14
(fast/CBFP, group 2)
In the event of an arc fault, the output contact will close at 7
ms when three-phase current measurement is used.
If CBFP is used, the trip relays 2 and 4 will operate after a pre-
set delay time of 100 or 150 ms if the preconditions for the arc
fault still exist.
If several trips are required, the multiplying relay VAR 4CE
can be used.
Wiring alarm circuits
Alarm signals generated by the arc protection system (trip and
self-supervision alarms) can be forwarded to higher-level
switchgear supervision and control systems through the output
contacts.
Self-supervision alarms
The self-supervision system issues a self-supervision alarm
when it detects a fault in a central unit function or an incorrect
number of sensors.
Connect the self-supervision alarm output to an IF change-over
contact, either terminals X1-17, X1-18 (normally closed) or X1-
18, X1-19 (normally open).
During normal system operation (no internal fault) and with
the auxiliary power supply connected, the terminal X1-17 or
X1-18 is open and X1-18 or X1-19 is closed.