VAMP Ltd
Generator protection relay
Technical description
VAMP 210
VM210.EN004
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17
When the negative phase sequence current just slightly exceeds
the set start level (K
2
) the operating time tends to become very
long. Therefore the maximum operating time has been limited
to 1000 seconds, although the operating time calculated from
the expression would be longer.
Besides inverse time characteristic the unbalanced load unit
can also be configured for definite time operation characteristic.
Figure 2.2.3-1. Operation characteristic of the unbalanced load unit.
Parameters of the unbalanced load unit:
I
2
> (46)
Parameter: Value/unit:
Measured
value
I
2
%
Neg. ph. seq. current as comp. to
Ig
I
2
> %
Setting
value
Setting
values
t>
s
Operating time [s]
SCntr
Cumulative
start
counter
TCntr
Cumulative
start
counter
Flt
%
Maximum fault current
Recorded
values
EDly %
Elapsed time as compared to the
set operating time, 100% =
tripping