Arc Protection With One Ref610 Relay - ABB REF610 Technical Reference Manual

REF610 REF610
6.2.
6.2.1.
160
Feeder Protection Relay
Technical Reference Manual - ANSI Version
Element 50P-2 should have the shortest and element 51P the
longest operate time.
Example:
Start by checking that the switches have been properly set:
Settings
SG1/5=1
SG3/1=1
Number of shots = 3
If one or several phase currents
exceed the set pickup value of element 51P but not of elements 50P-1 and
*
50P-2, the AR sequence will include shot 1, 2 and 3
exceed the set pickup value of elements 51P and 50P-1 but not of element
*
50P-2, the AR sequence includes only shot 1
exceed the set pickup value of elements 51P, 50P-1 and 50P-2, no shots
*
will be performed (AR function disabled).
Element 50P-2 should have the shortest and element 51P the
longest operate time.
Arc protection

Arc protection with one REF610 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 REF610 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 element 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.
Function
Blocking of initiation of shot 2 and 3 by the trip signal
from element 50P-1
Disable of the AR function by the trip signal from element
50P-2
1MRS755535