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NGR Monitor

P/N: B94013700

  • Determination of RNGR with passive and active measurement methods

  • Continuous monitoring of the RNGR even if the installation is de-energised;

  • Alarm or trip on ground fault


The NGRM700 is only intended for use in high-resistance grounded systems. In these systems, the NGRM700 monitors

  • the current through the neutral-grounding resistor (NGR),

  • the voltage between the star point of the transformer and earth (voltage drop across the NGR),

  • the condition of the NGR, line-to-line and line-to-earth voltages.

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