Circuit Breaker Failure Protection (Cbfp) - Eaton EAFR-102 User Manual

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
Figure 9. LV or MV Stand-alone Application.
T2 BI 1
Eaton Arc Flash Relay
POWER
ERROR
E-Series
T1,T3,T4
T1
T2,T4
S1
S2 S1
S3
QD
BI1
S2
BI2
BO1
SET
S3
EAFR-102
A
CB
CB
CB
EAFR-102 Arc Fiber Loop Sensor Relay User Manual MN026006EN February 2016 www.eaton.com
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).
ON OFF
Light Light and Current
8
S1: Light
Light and Current
7
Latch
Non Latch
6
100 ms
150 ms
5
4
3
Configuration Select
2
1
CB
6. Application Examples
CB
9