The LINAM UGFI Underground Fault Indicator
Reduce the duration of outages by streamlining underground fault locating.
Adjacent-phase immunity to prevent false tripping
Our proprietary adjacent-phase immunity technology—the best in the industry—prevents false trips 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 providing 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 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 the LINAM UGFI with confidence in harsh environments like underground vaults. The fault indicator is waterproof at depths up to 7.6 m (25 ft), and the polycarbonate housing and stainless steel cable clamp are corrosion-resistant.
The LINAM UGFI meets and exceeds IEEE 495 testing standards for faulted-circuit indicators.
Line-powered and battery-free
The LINAM UGFI harvests fault and load current to power all functions—including the 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.
Multiple 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.
Simple SCADA interface
Use the auxiliary output contact to send the fault status through a remote terminal unit to SCADA.
Remote fault indication
The RadioRANGER Underground Wireless Fault Indication System minimizes the fault-locating time and improves crew safety by eliminating the need to open energized enclosures or enter subsurface vaults during fault-finding patrols.
The RadioRANGER transmitter connects to up to 12 LINAM UGFI devices and uses a short-range wireless signal to communicate the device status to a handheld receiver. This allows personnel to easily monitor enclosures that are difficult to access and read the status of subsurface devices at street level.