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AutoRANGER
AutoRANGER
TM
Field Guide
Application Overview
The AutoRANGER is a self-adjusting fault indicator. It automatically
selects one of eight discrete trip values based on the sampled load
current of the circuit to which it is applied.
Load Current Range
Trip Value
10 A
< I < 25 A
50
25 A
< I < 50 A
100
50 A
< I < 100 A
200
100 A
< I < 200 A
400
200 A
< I < 300 A
600
300 A
< I < 400 A
800
400 A
< I < 500 A
1000
500 A
< I
1200
Display Modes
By checking circuit conditions after a fault, the AutoRANGER distinguishes between temporary
(self-clearing) and permanent faults. It then displays each type of fault uniquely.
Temporary Faults
The AutoRANGER indicates a temporary fault by ashing a single,
forward-facing amber LED for eight hours.
Permanent Faults
The AutoRANGERs two forward-facing red LEDs indicate a permanent
fault. However, the ashing duration for a permanent fault depends
on the pre-fault load: the AutoRANGER varies the duration of its
permanent fault indication to allow more time for a line crew to patrol
lightly loaded circuits (likely located in remote areas of a utilitys system).
Fault Mode
Pre-Fault Load
Flashing Duration
LED Color
Temporary
I
< 50 A
8 hrs
Amber
I
> 50 A
Permanent
I
< 50 A
8 hrs
Red
I
> 50 A
4 hrs
Flashing duration based on fault type and pre-fault load.
Making Electric Power Safer, More Reliable, and More Economical
®
Note: the AutoRANGER is applicable on circuits with less than
10 A of nominal load; however, there will be a few minutes
of unavailability upon installation or after a reset, to verify
energized line conditions. In addition, the unit will not enter the
temporary fault display mode (see Display Modes) because it
cannot discriminate between temporary and permanent faults
under this loading condition. Please contact E. O. Schweitzer
Manufacturing for further details. In addition to distinct display modes for permanent and temporary faults, the AutoRANGER also uses
different display modes for daytime and nighttime conditions based on ambient light measurement. While
daytime mode produces full intensity from the forward-facing LEDs, a user should be directly underneath
the indicator to interrogate the display. When the AutoRANGER is in permanent mode during dark ambient
lighting conditions, two internal red LEDs also activate to illuminate the indicators translucent housing. This
allows line crews to see the AutoRANGER at night from 360 degrees at distances greater than 1,000 feet.
Fault Indication Modes
Any overcurrent condition above the self-adjusted threshold, sustained for more than 24 ms, will cause the
AutoRANGER to enter the red permanent fault display mode. Two minutes after the fault, the indicator will
check for system voltage and current, and make one of three decisions:
New Sustained Load If the overcurrent condition is actually a new, higher sustained load, the indicator
exits the permanent fault display mode and self-adjusts to the appropriate trip level.
Temporary Fault
An energized circuit with nominal current signies a self-clearing fault or a
successful trip and reclose operation: the unit switches to the temporary fault display
mode for an additional 8 hours. Indicators that are in the temporary fault mode
will reset anytime the circuit is de-energized. This ensures that a new fault is given
priority over an older, temporary fault.
Permanent Fault
A de-energized circuit signies a circuit lockout: the indicator will remain in the
permanent fault display mode for 4 or 8 hours, depending on pre-fault load (see the
table on reverse side).
Inrush Restraint
Fault indicators applied on circuits with reclosing schemes should be immune to inrush currents occurring
during reclose attempts. Otherwise, the reclosing operations could falsely trip indicators installed on
unfaulted line sections. To properly restrain from tripping on inrush current, the AutoRANGER does not
respond to any overcurrent for a minimum of ve minutes after a reclosing operation. The maximum
inrush restraint time is the duration of the circuit outage plus two minutes. Do not install AutoRANGER fault
indicators on a dead circuit to detect a fault on a reclose attempt.
Reset and Test
Because the AutoRANGER is a true timed reset fault indicator, it provides security against false reset from
backfeed currents or voltage elds from overbuilt/underbuilt systems. To manually reset the AutoRANGER
with the CRSRTT tool, simply apply the magnet tool directly over the AutoRANGER logo on the front of the
indicator for approximately 5 seconds. Use the same procedure to test the indicators battery integrity:
doing so will activate an untripped indicators LEDs in a ashing test pattern.
Making Electric Power Safer, More Reliable, and More Economical
®
AutoRANGER Field Guide
Tel: 847.362.8304 Fax: 800.424.0762 www.eosmfg.com csr@eosmfg.com