VAMP 135
Over-, under-, residual voltage and
frequency relay
Technical description
VAMP Ltd
14
VAMP 24h support phone : +358 (0)20 753 3264
VM135.EN008
Parameter
Parameter
Parameter
Parameter
Value
Value
Value
Value
Unit
Unit
Unit
Unit
Default
Default
Default
Default
Description
Description
Description
Description
LVBlck
2…100
%Un 40
Configurable low
voltage blocking limit.
Common for f><, f<
and f><><, f<<
Measured and recorded values of the overfrequency and
underfrequency stages:
f><, f>><< (81)
f><, f>><< (81)
f><, f>><< (81)
f><, f>><< (81)
Parameter
Parameter
Parameter
Parameter
Value
Value
Value
Value
Unit
Unit
Unit
Unit
Description
Description
Description
Description
Measured
value
f
Hz
Frequency
SCntr
-
Start counter (Start) reading
TCntr
-
Trip counter (Trip) reading
Flt
Hz
The ma><. fault value
Recorded
values
EDly
%
Elapsed time as compared to
the set operating time; 100%
= tripping
2.3.5.
Underfrequency protection f<, f<< (81L)
The underfrequency unit comprises two separately adjustable
frequency stages (stage f< and f<<). The protection stages
operate with definite time characteristics.
The overfrequency unit measures the frequency based on the
measured voltages.
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.
&
t
&
&
f
fplohko
t
s
t
r
>
Blocking
Setting
f< s
Delay
Start
Trip
Event
register
Enable
events
Event
register
Figure 2.3.5-1. Block diagram of the underfrequency stages f< and f<<
