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Ground Fault Products for Grounded and HRG Systems

Neutral Grounding Resistor (NGR) Monitoring

  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • NGRM700

    Ground fault and neutral grounding resistor (NGR) monitor for high-resistance grounded (HRG) systems

    The NGRM700 is a multi-purpose device used for monitoring high-resistance grounded (HRG) systems for ground faults, as well as monitoring the integrity of the neutral grounding resistor (NGR). A digital display shows all measured values in real time. Passive and active measurement methods are used for NGR monitoring, enhancing accuracy. The NGRM700 includes many advanced features, including AC and DC fault detection, online and offline NGR integrity monitoring, indication of faulted phase, location pulser, and more. The integrated HMI is detachable for panel door mounting. Combining the device with an RCMS series multi-channel relay allows for automatic branch fault location and shutdown. A built-in web server and Modbus/TCP support allows for reading values on demand across industrial Ethernet networks.

  • Key Features: NGRM700

    • Ground fault and NGR monitoring for high-resistance grounded systems
    • Detects AC and DC ground faults
    • Digital display showing values in real-time
    • NGR integrity monitored using passive and active measurement methods
    • NGR integrity monitoring even while system is offline
    • NGR current and voltage monitoring
    • Indication of faulted phase
    • Tripping on RMS, fundamental component, or harmonics
    • FFT analysis of measurement signals
    • Pulser for manual ground fault location
    • Wide band power supply
    • Detachable HMI for panel door mounting
    • Built-in web server showing all values in real-time
    • Integrated Modbus/TCP support
    • Tested for use up to 5000 m AMSL
  • Applications: NGRM700

    • High-resistance grounded systems
  • Ordering information: NGRM700

    NameSupply VoltageOrdering Number
    NGRM700AC 24 - 240 V (40 - 70 Hz) DC 24 - 240 V B94013700
  • Downloads: NGRM700

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    NGRM700
    English 12.2016
    Download
    Installation Bulletin
    NGRM700
    English 12.2016
    Download
  • Accessories: NGRM700