9
6. Application Examples
EAFR-102 Arc Fiber Loop Sensor Relay User Manual
MN026006EN February 2016 www.eaton.com
Figure 9: LV or MV Application, shows an example of a sys-
tem applying both over-current and arc light for tripping from
the fiber sensor channels S2 and S3 activation and arc light
only from fiber sensor channel S1 activation. The S1 chan-
nel is monitoring the transformer feeder bus duct above the
current monitoring point. The S2 channel is monitoring the
main breaker and the busbar. The S3 channel is monitoring
each feeder. For the maximum length of each fiber sensor
type, refer to Section 4: Arc Sensors.
The current monitoring signal in this application is coming
from an external over-current relay.
Figure 9: LV or MV application example with light and cur-
rent tripping criteria for fiber sensor channels S2 and S3.
The sensor channel S1 monitoring the zone before the CT is
set to operate on light only. The current threshold monitor-
ing signal may come either from an external over-current
relay or from the EAFR-110 arc protection relay. In this
example an over-current relay (50/51) is applied to monitor
the over-current condition.
6.2 Circuit Breaker Failure Protection (CBFP)
The EAFR-102 includes a selective circuit breaker failure
function which can be enabled by dipswitch setting (see
Section 3.5: Dipswitch Settings). When enabled, the break-
er failure function activates when the tripped breaker fails
to operate. The Breaker Failure function is activated if the
EAFR-102 detects the presence of light after a set operat-
ing time. When the EAFR-102 is set to operate on light
and current, both parameters must persist to activate CBFP.
Breaker failure can be set to operate either on 100 ms or
150 ms delay (see Section 3.5: Dipswitch Settings).
Figure 9. LV or MV Stand-alone Application.
A
T1
T2
S2
BI 1
CB
CB
CB
S1
S3
ON OFF
E-Series
CB
CB
Configuration Select
8
7
6
5
4
3
2
1
Light
Light and Current
Light and Current
EAFR-102
ERROR
T1,T3,T4
T2,T4
POWER
SET
S1
S2
S3
BI1
BI2
BO1
QD
Eaton Arc Flash Relay
S1: Light
Latch
100 ms
150 ms
Non Latch
