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Fault Indicators and Sensors

Fault Indicators and Sensors

SEL designs and manufactures fault indicators and sensors, supplying utilities around the world with products that help reduce fault-finding time so that power can be restored quickly after a fault occurs. SEL is the electric power industry's leader in fault indicator technology, producing the widest variety of fault indicator products.

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Advantages of SEL Fault Indicators

  • They help utilities restore service faster.
  • They reduce fault-finding time by 50 percent.
  • Compact, lightweight construction simplifies installation.
  • Strong, simple clamping mechanisms fit various conductor sizes, ensuring fast, reliable installation.
  • Displays are easy to spot and read and require fewer holes to be drilled in a transformer cabinet for installation.
  • Any SEL fault indicator that uses batteries relies on patented technology, offering the longest cumulative flashing-hour life in the industry. 
  • Require little, if any, maintenance.
  • Magnetic cable guides keep remote display and sensor wiring neatly in place.
  • Standard and custom solutions are available.

Videos

Flashing LED Fault Indicators

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Flashing LED Fault Indicators

SEL Quality

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SEL Quality

SEL Reliability

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SEL Reliability

System Components

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Overhead Fault Indicators

SEL offers a variety of fault indicators for use on unfused taps, long feeders with midline reclosers or sectionalizers, overhead to underground transitions, and feeders that experience recurring faults.

Choose from manual, timed, or automatic reset models and line- or battery- powered options. Easy-to-install and maintenance-free, SEL fault indicators help identify and locate temporary and permanent faults faster, enabling the utility to make repairs and restore power faster.

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Underground Fault Indicators

SEL offers a variety of fault indicators for use on subsurface or pad-mounted transformers, subsurface or pad-mounted switchgear and sectionalizing cabinets, junction boxes, and splices. Choose from single-phase underground or three-phase underground (single-phase sectionalized or three-phase sectionalized), depending on your application. Select from manual, timed, or automatic reset models and cable- or battery-powered options. An auxiliary contact option provides SCADA compatibility. SEL fault indicators help identify and locate temporary and permanent faults faster, enabling the utility to make repairs and restore power faster.

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Wireless Solutions

SEL is continuously developing new radio communications products for underground applications. The SEL RadioRANGER Wireless Fault Indication System works with an RF link between the Wireless Interface and a Remote Fault Reader, enabling crews to determine the fault indicator status and locate faults on distribution networks, without needing to enter a vault or open a pad-mount enclosure. The WSO–Wireless Sensor for Overhead Lines stores load and temperature data and monitors the distribution line for loss of voltage, loss of current, or fault events. Data packets are periodically transmitted by radio. With either product, faulted sections of cable are detected in half the time, line crews can be dispatched faster, and service is restored.

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Tools and Sensors

SEL tools and sensors may be used in conjunction with SEL fault indicators or as stand alone devices.

Applications

Open, enter, and pump multiple underground valuts to find a fault

RadioRANGER Wireless Fault Indication System with Underground RadioRANGER Fault Indicators

Paper-Insulated Lead Cable (PILC) in system requires thumping to locate faults

PILC fault indicators with wide range of sizes and configurations.


Literature