VAMP 150
Motor protection relay
Technical Description
VAMP Ltd
22
Vamp 24h support phone : +358 (0)20 753 3264
VM150.EN005
2.2.9.
Arc fault protection (option) ArcI> (51L>),
ArcI
0
> (51NL>)
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 150. The binary output can be
connected to a maximum of three binary inputs of another
relay.
&
&
IL1
IL2
IL3
MAX
Iarcset
>
Register
events
Trip
Enable events
Setting
ArcI>
L1>
L2>
ArcBI
>
Figure 2.2.9-1. Block diagram of the arc protection stage ArcI>. The symbol
of the starting of the arc sensor is L> and that of the fast overcurrent stage
is ArcI.
The setting of the arc protection stage is performed in the menu
called IL SETTING/ArcI Set.
