VAMP Ltd
Feeder and motor manager
Technical description
VAMP 257
VM257.EN002
VAMP 24h support phone : +358 (0)20 753 3264
89
Setting parameters of VT supervisor:
VTSV ( )
Parameter Value
Unit Default Description
U2>
0.0 … 200.0;
%Un 34.6
Upper setting for VT
supervisor
I2<
0.0 … 200.0;
%In 100.0
Lower setting for VT
supervisor
t>
0.02 … 600.00
s
0.10
Operation delay
VT on
On; Off
-
On
VT supervisor on event
VT off
On; Off
-
On
VT supervisor off event
Measured and recorded values of VT supervisor:
VTSV ( )
Parameter Value Unit
Description
U2
%Un Measured negative sequence
voltage
Measured
value
I2
%In
Measured negative sequence
current
Date
-
Date of VT supervision alarm
Time
-
Time of VT supervision alarm
U2
%Un Recorded negative sequence
voltage
Recorded
values
I2
%In
Recorded negative sequence
current
2.4.8.
Circuit breaker condition monitoring
VAMP257 has an advanced condition monitoring function that
supervises the wearing of the circuit-breaker. Thus, the
condition monitoring can give alarm for the need of CB
maintenance; well before the CB condition is critical.
The CB wear function measures the breaking current of each
CB pole separately and then estimates the wearing of the CB
accordingly a permissible cycle diagram.
The permissible cycle diagram is usually available in the
documentation of the CB manufacturer. The diagram specifies
the permissible number of cycles for every level of the breaking
current. This diagram is parameterised to the unit with eight
cycle points (current, cycles).
There are two alarm levels in this function. One can
parameterise so that the nominal current of the CB is given
and then, how many times the CB must be able the break the
nominal current, when the alarm is given. The second one can
be set accordingly a typical fault current.
