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 Learn More About the AutoRANGER Family of Products
See the Overhead AutoRANGER page
AR URD
Underground AutoRANGER
| Features and Benefits |
- System-Wide Adaptability
The AutoRANGER family’s autoconfiguration features decrease the
need for crew training, selection analysis, and inventory, resulting in
fewer application errors.
- Minimal Maintenance
The AutoRANGER’s ability to adjust for load fluctuations results in
a decreased need for field service. For underground applications, choose a target-only (no LED) display option to eliminate the need
for a battery. BEACON® LED models have a 15-plus-year product and
battery life: minimize trips to the field to replace batteries.
- Configuration Choices Optimize Performance
Ensure the best fault-indicating solution for your underground
application by choosing from a wide variety of single- and three-phase
display options, including remote displays that eliminate the
need to open the enclosure to check the fault indicator’s status.
- Five-Year Warranty
SEL provides a full five-year warranty for all products produced by
its E. O. Schweitzer Manufacturing Division, the longest warranty in
the fault-indicator industry.
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| Applications |
- Autoadjusting Trip-Level Selection
Automatic trip-level selection based on sampled load current
makes the AR-URD suitable for applications with fault currents
ranging from as low as 50 A to greater than 1200 A. This feature
simplifies ordering and inventory and reduces maintenance and
application errors.
- Line-Powered Functionality
Energy required to power the microprocessor comes from
monitored load current rather than a battery, decreasing
maintenance and cost of ownership.
- Dynamic Trip-Response Times
By monitoring current, the AR-URD automatically adjusts its trip response
time to better coordinate with upstream protection.
- Current-Activated Timed Reset
Each AR-URD derives a normalization current as a function of
measured circuit load. The AR-URD uses the normalization current
to distinguish circuit restoration from backfeed current; it is this
threshold that the AR-URD must detect before initiating the reset
timer (0, 2, 4, or 8 hours). Targeted AR-URDs provide fault indication
until the time criteria have been met following the detection of
normalization current. The AR-URD interprets currents lower than
the normalization current as backfeed, and consequently delays
automatic reset.
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Applying LINAM Fault Indicators With Other SEL Products |
Working together, SEL fault indicators and
distribution protection equipment can identify the location of a fault.
When a fault occurs, the SEL feeder relay
calculates the fault location as a distance from the substation to the fault, which is
communicated to a lineman’s cell phone via
the SEL-3010 Event Messenger. However, if a
feeder has multiple taps (see diagram below), the relay cannot determine on which
tap the fault occurred. SEL fault indicators
point to the faulted section of line, which
can now be correlated to the fault location
provided by the relay.
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| Underground Dynamic Trip Response Time |
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| Specifications |
| Fault Sensing Range |
50 to 1200 A |
| Voltage Range |
Equal to voltage class of shielded underground cable |
| Minimum Operating Current |
3 A |
| Current-Activated Timed Reset |
0-, 2-, 4-, and 8-hour options |
| Battery (for BEACON LED displays only) |
3.6 V high-capacity 2.4 Ah lithium battery with a 20-year shelf life |
| Configuration Options |
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Three-phase sensor configuration
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Three-phase "3" display |
Single-phase sensor configuration
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Integral target, standard "V", large "L", or tamperproof bolt display (BEACON LED optional). |
| Dynamic Trip-Response Time |
Function of trip level (see graph above) |
| Inrush Restraint Response Time |
5 cycles |
| Temperature Range |
-40° to +85°C (-40° to +185°F) |
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Fault Indicators
