VAMP Ltd Generator protection relay
Technical description
VAMP 210
VM210.EN004 Vamp 24h support phone: +358 (0)20 753 3264
29
Parameters of the overfrequency protection:
f>, f>> (81)
Parameter: Value/unit:
Measured
value
f Hz Frequency
f>, f>> Hz Frequency as primary value
Setting
values
t>, t>> s Operating time
SCntr Cumulative start counter
TCntr Cumulative trip counter
Flt %
Max. frequency under a fault
situation
Recorded
values
EDly %
Elapsed time as compared to the
set operating time, 100% =
tripping
2.2.13. Underfrequency protection (81L)
The underfrequency stage comprises two independent
adjustable stages. The setting resolution of both stages is 0.01
Hz and both stages have their own operate time settings with
definite time characteristic.
The relay starts, if the actual value for the frequency goes
below the setting value. If the underfrequency situation
continues after the start time has elapsed, the relay trips.
Figure 2.2.13-1 Block diagram of the underfrequency protection.
The operation of the underfrequency stages can be blocked by
other stages or digital inputs via block matrix. The two stages
have also a common undervoltage block limit.
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