6
4. Arc Sensors
EAFR-102 Arc Fiber Loop Sensor Relay User Manual
MN026006EN February 2016 www.eaton.com
Figure 5. EAFR-102 Configuration Selection 1.
3.5.1.2 Configuration Selection 1.
The EAFR-102 logic configuration I is mainly utilized in selec-
tive arc protection solution. The fiber sensor S1 monitors
the outgoing feeder cable compartment. The fiber sensor
S2 monitors the corresponding feeder breaker compartment
and busbar compartment. Trip contact T1 is responsible
for tripping the circuit breaker of the outgoing feeder. The
detailed instruction is described in the EAFR Standard Arc
Configurations booklet.
3.6 Non-volatile Memory
All critical system data including dipswitch settings and
auto-configuration file described in Section 3.3.1 are stored
in EPROM non-volatile memory to ensure correct operation
and full self-supervision, even if auxiliary power is lost tem-
porarily.
Also, all LED indications described in Section 3 are stored
in non-volatile memory in order to provide quick recovery of
the system status indication even if auxiliary power is tem-
porarily lost. This feature is especially important if auxiliary
power is lost after tripping.
Non-volatile memory does not require a power supply to
maintain information and will retain settings and indications
permanently without power.
BI1
S1
S2
S3
&
&
OR
OR
OR
OR
T1
T2
T3
T4
BO1
OFF
ON
SW1/8
OR
ON
OFF
SW1/7
OR
SW1/5
100ms
150ms
ON
OFF
SW1/5
100ms
150ms
ON
OFF
SW1/5
100ms
150ms
ON
OFF
OR
BI2
ON
OFF
Setting EAFR-102
SW1
Configuration Select
8
7
6
5
4
3
2
1
Light
Light and Current
Light and Current
EAFR-102 Configuration 1 Logic Diagram
S1: Light
Latch
100 ms
150 ms
Non Latch
4. Arc Sensors
Eaton Arc Flash Relays provide a choice of different types
of arc sensors to be utilized in different units and different
switchgear types, according to specific application require-
ments. Available sensor types are arc light point sensors
and arc light fiber optic loop sensors.
Arc light point sensors are typically installed in metal clad
compartments providing quick and accurate location of the
faulted area. Arc light fiber loop sensors are installed typi-
cally to cover a wider protected area with one fiber when no
need for more exact fault location exists.
