Grounding resistor monitoring system LINETRAXX® NGRM500

measurementfor power distribution networksEthernet

The NGRM500 is only intended for use in high-resistance grounded systems. In these systems, the NGRM500 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. In order to meet the requirements of applicable standards, customised parameter settings must be made on the device to configure it for local equipment and operating conditions. • 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 • Monitoring of the current INGR • Monitoring of the voltage UNGR • Ethernet communication • Web server • Language selection (German, English GB and US, Spanish, French) • Test button (internal, external) with/without tripping • FFT analysis of the measuring signals • Pulser for manual ground fault location • Relay for detection of ground faults and resistor faults • Relay for shutdown of the installation after a configurable time • Can be combined with RCMS… for automatic shutdown of feeders • Graphical user interface • Wide supply voltage range • Range of use up to 2000 m AMSL • Fault/History memory • Analogue output of measured values (0…10 V, 4…20 mA, etc., selectable parameters) • Password protection • Tripping on RMS, fundamental component signal or harmonics • Detection of AC and DC ground faults