Line IQ

Line IQ

Advanced Distribution and Sub-transmission Line Monitoring

Quickly identify faults, protect against overload,
and intelligently monitor lines from 5 kV to 138 kV

  • Easy hotstick installation
  • Multiple communications options
  • No IT infrastructure required
Product Information
Order & Spec Info
  • Features

    As the grid gets smarter, so must the sensors. GridSense provides the only true Line Health Monitor available in the market. Yes, it performs all of the traditional fault current indicator functions, but it also does so much more, putting it in a category by itself.

    • Smart adaptive sensing of events, load, voltage and temperatures
    • Intelligent algorithms to provide highly accurate, configuration-free overhead line fault detection
    • Voltage measurement enables detection of load flow, power factor, and direction of the fault
    • Dynamic rating of lines using ambient and conductor temperature readings
    • Tested in accordance with the IEEE 495-2007 standard for faulted circuit indicators
    • Provides visible (LED) indication of fault conditions


    LineIQ monitors overhead network lines up to 138 kV, letting you quickly determine fault location and cause, and quickly restore power even as you prevent future outages.

    At the system’s heart is an innovative, self-powered sensor easily installed on energized lines. The sensor enables continuous capture of critical performance data, including:

    • Fault waveform
    • Load profile
    • Power factor
    • Line status and condition
    • Ambient and conductor temperature
    • Time-stamped event recordings
    • Fault direction


    View real-time, actionable data about your grid with intuitive, graphical displays
    and exportable files in graphical or tabular formats. There’s no infrastructure
    required; all you need is an Internet connection and an Internet device.

    • Facilitates rapid fault location
    • Provides real-time data for System Operators, Maintenance Personnel, Protection Engineers and Design Engineers
  • Ordering Information

    LIQ-60Overhead Line Monitor


    Line Voltage: 5 kV to 138 kV
    Conductor Range: 6 mm (0.25”) up to 32:mm (1.3”)
    Sample Rate Current: 600 Hz, Voltage 600 Hz
    Accuracy:Current: 2% of reading ± 1A
    Load recording range: 1A – 25kA
    Current sensor fault detection range: 5A -25kA
    Ingress Protection: IP66
    Measured Parameters:Current and power (On/Off)
    Fault/Event Capture:60-Sec RMS profile (I & E-Field)
    Pre-event Line Loading
    Fault Current Magnitude up to 25 kA
    Fault Current Waveform (200 ms)
    E-Field Waveform % Change (200 ms)
    Energy Storage/Power Source:Solar with battery backup
    Communications:Local RF 150 ft (50 m); Cell (GSM/CDMA), Landline;
    DNP3, Web Services SCADA & historian integration tools available
    Memory:100 events (60 sec RMS records); 32 fault waveforms;
    up to 85 days’ load profiling