Grounding resistor monitoring device NGRM700

ground faultcontinuous

- Comprehensively configurable - Designed for easy retrofit - Multilingual user interface - Can operate on systems 5000 m above sea level without derating The NGRM700 is an advanced device that allows continuous NGR monitoring to provide all necessary information of the system grounding. The NGRM700 monitors the resistance value of the Neutral Grounding Resistor (NGR) and the fault current flowing through the NGR in High Resistance Grounded (HRG) systems. The ideal relay to protect HRG systems and to provide a comprehensive overview. The relay can be connected to the supervision system or directly to the communication network. The NGRM700 allows the user to meet local requirements. • 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 • Phase-to-ground fault indication (optional; up to 690 V direct coupling, otherwise via potential transformers) • 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 (24 to 240 Vac/Vdc) • Range of use up to 5000 m AMSL • Fault/History memory • Analogue output of measured values (0…10 V, 4…20 mA, etc., selectable parameters)