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Fault Path Indicators 3kv-33kv





How does it work?

The LLT-360 Fault path indicator provides a bright flashing LED display with 360 degrees of visibility, when a power outage is experienced.

A distinctive "rotational" flash sequence enhances fault display location. Advanced micro processor technology senses and measures load and detects faults on lightly loaded line with as little as 50 A of current. The LLT-360 steps up its trip threshold as load increases to remain secure through 1200 A loads, and can be used up to 34.5kv overhead lines.

Permanent and temporary faults are identified separately through the use of red and amber LEDs and flash patterns. The LLT-360 identifies temporary faults with flashing amber-colored LEDs. Permanent faults are indicated by a combination of alternating red and amber LEDs.

LLT-360 Fault Indicators are quick and easy to install with one hot stick. There are no clamps to disassemble. No extra hardware is needed. Detect temporary faults before they become outages, and speed restoration after permanent faults with LLT-360 Fault Indicators.


The LLT-360 AutoRANGER® Overhead Faulted Circuit Indicator Sensor indicates and distinguishes between temporary and permanent faults when mounted on an overhead bare conductor. Its purpose is to reduce fault locating times and improve system reliability.


Principle of Operation

After you install the AR360 fault path indicator with a single hot stick, its sophisticated microprocessor goes to work. It samples the current and automatically adjusts its trip value for secure and dependable performance. Faults start a red-amber alternating flashing sequence that appears to rotate around the device.

After two minutes, the microprocessor checks for voltage and load current to determine if the fault was temporary or permanent. Permanent faults cause the red-amber sequence to continue. Temporary faults switch the flashing sequence to amber only. After a time-out period, the flashing automatically stops.



Specifications of the LLT-360


Technical Characteristics Include:

1. Sensor Architecture

The LLT-360 fault path indicator sensor uses a microprocessor to determine system current by measuring the output of an open-core current transformer inductively coupled to an overhead conductor. The sensor is held on an overhead conductor by a spring clamp that is energized to the conductor’s line potential.

A microprocessor detects the voltage gradient formed between the spring clamp and an electrostatically coupled metallic plate near the face of the sensor to determine the presence of system voltage. Circuit logic distinguishes between higher or lower circuit loading conditions, temporary faults (flashing amber LEDs) after a successful reclose, and permanent faults (red-amber LED rotating flash sequence) after a sustained outage.

2. Inrush Restraint

The sensor shall have a true inrush restraint algorithm to ensure it will not falsely trip on inrush following a reclose operation by activating the loss-of-current and/or voltage circuitry when the recloser opens

3. Scalability

The sensor shall be capable of monitoring a single-phase conductor of an overhead three-phase radial system.

4. Current Range

The sensor shall automatically select one of eight discrete trip levels based on measured load current. The sensor shall not lower its trip value unless it detects sustained load current and primary voltage, thereby preventing false tripping from low trip values after an extended outage.

5. Voltage Range

The sensor shall be applicable to an overhead radial distribution circuit with a system voltage within the range of 4160 V to 34.5 kV

6. Display

The sensor shall have six ultra-bright, wide-angle LEDs to indicate a temporary or permanent fault. The LED display shall provide 360-degree visibility. The sensor shall indicate temporary faults (self-clearing faults) by flashing amber LEDs. Permanent faults shall be indicated by a rotating flash sequence of red and amber LEDs.

7. Mechanical Design

The sensor shall be single hot stick installable on overhead conductors of overhead distribution circuits with conductor diameters inclusive of 0.406 cm to 3.81 cm (0.160 in to 1.50 in).

8. Environment

The sensor shall be suitable for continuous operation over a temperature range of –40° to +85°C (–40° to +185°F).

9. Field Testing

The sensor can be manually test activated and reset using an optional magnetic test tool.

10. Automatic Resetting

The sensor shall have a true timed reset function which automatically resets the device upon expiration of factory-set time period.

11. Operational Frequency

The sensor shall detect temporary and permanent faults in the 50 to 60 Hz frequency range.

12. Environmental Parameters

The sensor shall be appropriate for at least 15-year exposure in an outdoor environment.

13. System Powering

The sensor shall be powered and be capable of sustaining 1800 flashing hours of operation. It shall incorporate a power-saving feature which will extend the product’s operational life by limiting power to LEDs when a phototransistor detects decreased ambient lighting conditions.

14. Warranty

The sensor has a five-year warranty.



Available at LLT sales :

Contact sales at :
Int: (002718) 468 5080
Tel: (018) 468 5080
Fax: (086) 667 2900
E – sales@liveline.co.za