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VAMP Ltd
Generator protection relay
Technical description
VAMP 210
VM210.EN004
Vamp 24h support phone: +358 (0)20 753 3264
31
2.2.15.
Arc fault protection (option) ArcI> (51 L>),
ArcI
0
> (51N L>), ArcI
02
> (51N L>)
The arc fault protection has been realized with an arc sensor
(or sensors) and an extremely fast overcurrent function Iarc
and Ioarc using the arc optional card.
The arc protection unit operates, when the arc sensor detects
an arc fault or the binary input (BI) of the arc option card is
activated and the fast overcurrent stage ArcI> measures
overcurrent simultaneously.
The earth-fault arc protection unit operates, when the arc
sensor detects an arc fault or the binary input (BI) of the arc
option card is activated and the earth-fault function ArcIo>
measures earth-fault simultaneously.
The sensor connections (S1, S2) and binary input (BI) can be
set, individually or any combination of these, to operate the
ArcI> and ArcIo> protection stages.
The operating time of the arc protection stages are
approximately 15 ms.
The sensor connections and binary input can be set to activate
the binary output (BO) in the output matrix, DO menu. The
binary output can be used to forward light information to
another relay, e.g. VAMP 140. The binary output can be
connected to a maximum of three binary inputs of another
relay.
&
&
Im1
Im2
Im3
MAX
Iarcset
>
Register
events
Trip
Enable events
Setting
arcI>s
L>
&
Register
events
Start
Figure 2.2.15-1 Block diagram of the arc protection stage.
In the above figure the symbol of the starting of the arc sensor
is ’L>’ and ’Iarc’ of the fast overcurrent stage.