Example:
Start by checking that the switches have been properly set:
Settings Function
SG1/5=1 Blocking of initiation of shot 2 and 3 by the trip signal
from stage I>>
SG3/1=1 Inhibition of the AR function by the trip signal from stage
I>>>
Number of shots = 3
If one or several phase currents
*
exceed the set start value of stage I> but not of stages I>> and I>>>, the
AR sequence will include shot 1, 2 and 3
*
exceed the set start value of stages I> and I>> but not of stage I>>>, the
AR sequence includes only shot 1
*
exceed the set start value of stages I>, I>> and I>>>, no shots will be
performed (AR function inhibited).
Stage I>>> should have the shortest and stage I> the longest
operate time.
6.2. Arc protection
6.2.1. Arc protection with one REF 610 relay
In installations with limited possibilities to realize signalling between relays
protecting incoming and outgoing feeders, or if only the relay for the incoming
feeder is to be exchanged, an arc protection with a lower protective level can be
achieved with one protection relay.
An arc protection with one REF 610 only (see Fig. 6.2.1.-1) is realized by installing
two arc lens sensors, connected to the relay protecting the incoming feeder, to detect
an arc on the busbar. On arc detection, the arc protection stage will trip the circuit
breaker of the incoming feeder. The maximum recommended installation distance
between the two lens sensors in the busbar area is 6 meters and the maximum
distance from a lens sensor to the end of the busbar 3 meters.
156
REF 610REF 610
Feeder Protection Relay
Technical Reference Manual
1MRS755310
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