VAMP 135
Over-, under-, residual voltage and
frequency relay
Technical description
VAMP Ltd
6
VAMP 24h support phone : +358 (0)20 753 3264
VM135.EN008
Figure 2.1-1 Principle block diagram of a numerical protection relay.
Im
Um
U
2 samples / cycle
n
Digital
input
Settings
Amplitude and
phase shift of
base freqency
component
FFT calculation
Calculation of
symmetric
components
Protection
functions
Trip
start
Block
Block matrix
Output matrix
Output relay
control
K212vamp135
Figure 2.1-2 Block diagram of a software based protection relay.
t
s
t
r
&
t
&
&
U
1VUSLOHKO
>
Blocking
Setting
U>s
Delay
Enable
event
Start
Event
register
Trip
Event
register
Figure 2.1-3 Block diagram of a single-phase protection function.