html{display:none} LINAM UGFI Underground Fault Indicator | Schweitzer Engineering Laboratories

LINAM UGFI

Underground Fault Indicator

Reduce the duration of outages by streamlining underground fault locating with the LINAM UGFI Underground Fault Indicator.

Industry-leading adjacent-phase immunity technology prevents false trips caused by magnetic interference from nearby cables. A self-adjusting trip algorithm and a universal clamp allow you to simplify inventory—and you can install the LINAM UGFI on medium-voltage underground cables with a single hot stick. The LINAM UGFI is rugged, submersible, and battery-free, so you can deploy it with confidence in harsh underground environments.


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Adjacent-Phase Immunity—Our proprietary adjacent-phase immunity technology prevents false tripping by actively rejecting magnetic fields from nearby cables. The LINAM UGFI is immune to magnetic fields caused by fault currents up to 25 kA on adjacent phases at 10.2 cm (4 inches) center-to-center spacing.

Secure Fault Detection—The LINAM UGFI fault detection algorithm is reliable and secure. In addition to using industry-leading adjacent-phase immunity, it can respond to switch-onto-fault (SOTF) events, adapt to inrush conditions to prevent false tripping, and avoid false resets due to backfeed conditions.

Flexible Fault Detection Thresholds—The self-adjusting AutoRANGER algorithm automatically selects the trip threshold based on a seven-day load current profile. This allows one device to be used across various applications, simplifying ordering, inventory, and installation. For applications requiring fixed trip thresholds, the LINAM UGFI can be ordered with a wide range of trip thresholds, from 25 A to 1600 A.

Rugged and Submersible Design—Install with confidence in harsh environments like underground vaults. The LINAM UGFI is waterproof at depths up to 7.6 m (25 ft), and the polycarbonate housing and stainless steel cable clamp are corrosion-resistant. It meets and exceeds IEEE 495 testing standards for faulted circuit indicators.

Line-Powered Functionality—The fault indicator harvests fault and load current to power all functions, including timed-reset and LED display options. This eliminates batteries entirely and reduces maintenance time and ownership costs.

Current Reset and Timed-Reset Options—The LINAM UGFI offers multiple reset options. Order your device with a reset based on load current (≥1 A), a fixed time duration (2, 4, 8, or 12 hours), or a combination of both for added flexibility.

Simple SCADA Interface—Use the auxiliary output contact to send the fault status through a remote terminal unit (RTU) to SCADA.

Display Options—Choose a reflective mechanical target or an LED for the built-in display. Remote display options include a reflective mechanical target display, a remote LED via fiber-optic cable, and a bolt display that is discreet, tactile, and tamper-proof.

RadioRANGER Remote Fault Indication—Read the fault status without accessing the vault or enclosure using the RadioRANGER Underground Wireless Fault Indication System. The RadioRANGER transmitter connects to the LINAM UGFI and uses a short-range wireless signal to communicate the fault status to a handheld receiver.

Related Materials

Features

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      Submersible polycarbonate housing

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      Highly visible mechanical target display (also available with LED display)

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      Ability to easily connect a single hot stick to the hook eye for installation

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      Energy harvesting core

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      Rogowski coil

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      Cable clamp

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      SEL-8300 RadioRANGER Wireless Interface

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      SEL-8310 RadioRANGER Remote Fault Reader

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      LINAM UGFI with built-in LED and RadioRANGER remote display option that connects to the SEL-8300

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Details

Pad-Mounted Enclosure Applications—Use the LINAM UGFI to identify faults in the underground cable between enclosures. Deploy it across all your pad-mounted applications, including transformers, switchgear, sectionalizing cabinets, and junction boxes.

Subsurface Applications—Apply the LINAM UGFI to underground cables within subsurface vaults and maintenance holes to identify faulted cable sections. The LINAM UGFI is submersible and can withstand depths up to 7.6 m (25 ft). Remote display options make the fault status indication visible at a convenient location for workers. The RadioRANGER option communicates the fault indicator status to a handheld receiver, allowing personnel to read the status of a subsurface device at street level.

High-Visibility Displays

Choose a highly reflective mechanical target display or an LED with a fiber-optic port.

Extend the visibility of the fault indicator display with these remote display accessories:

  • Fiber-optic cable LED extension
  • Mechanical target display with a familiar fault indicator look and feel 
  • Tamper-proof bolt display that maintains a discreet pad-mount exterior

Remote display cables are available in lengths of 1.83 m (6 ft), 3.66 m (12 ft), and 6.1 m (20 ft).


RadioRANGER Remote Fault Indication

The LINAM UGFI can use a magnetic RadioRANGER Interface Probe to communicate fault indicator status to the RadioRANGER Underground Wireless Fault Indication System. With this system, utility personnel can quickly and safely retrieve subsurface fault indicator statuses at street level using a handheld SEL-8310 RadioRANGER Remote Fault Reader.


Simple SCADA Interface

Use the auxiliary output contact to send the fault status through an RTU to SCADA. Output contact cables are available in lengths of 1.83 m (6 ft), 3.66 m (12 ft), and 6.1 m (20 ft).


Self-Adjusting or Fixed Trip Thresholds

The self-adjusting AutoRANGER algorithm automatically selects the trip threshold based on a seven-day load current profile. The default AutoRANGER 2.0 minimum trip threshold is 25 A.

The LINAM UGFI can be ordered with a single fixed trip threshold. Available options range from 25 to 1,600 A.


Automatic Reset Method

There are three options for automatic reset: 

  • Upon restoration of load current ≥1 A
  • After a fixed time interval (options range from 2 to 12 hours) 
  • Upon the condition met first: current restoration or a fixed time interval


Nominal Distribution System Frequency

The LINAM UGFI operates at 60 Hz.

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.


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