LINETRAXX® NGRM700

  • 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.

Questions? Contact us!

NGRM
NGRM
  • 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.

Questions? Contact us!

Features

  • 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)
  • Detachable HMI for door mounting
  • Password protection
  • Tripping on RMS, fundamental component signal or harmonics
  • Detection of AC and DC ground faults

LINETRAXX® NGRM700 Variant(s)

TypeSupply voltage U/ Frequency range HzArt. No.
NGRM700AC 24…240 V, 40…70 Hz
DC 24…240 V
B94013700

Optional Accessories for LINETRAXX® NGRM700

CD-series coupling device

TypeVoltage UsysArt. No.
CD1000400…690 VB98039010
CD1000-2400…1000 VB98039053
CD50001000…4200 VB98039011
CD144004300…14550 VB98039054
CD2500014551…25000 VB98039055

Measuring current transformer

TypeVoltage/CurrentArt. No.
CTAC35
CTAC60
CTAS50
CTAS80
CTAS120
AC up to 30 AB98110007
B98110017
B98110009
B98110010
B98110011
CTUB103-CTBC35AC/DC up to 10 AB78120030
CTUB103-CTBC60
CTUB103-CTBC120
AC/DC up to 25 AB78120031
B78120032
CTB31…CTB51 seriesAC > 30…1000 AB980860xx

Voltage supply for measuring current transformers CTUB103…

Typemax. connected measuring current transformersArt. No.
STEP-PS/1 AC/24 DC/0.52B94053110
STEP-PS/1 AC/24 DC/1.757B94053111
STEP-PS/1 AC/24 DC/4.217B94053112

Downloads for LINETRAXX® NGRM700

NameCategorySizeLanguageTimestampD-/B-Number
NGRM700 Product Brochures 2.2 MB EN2023/11/1313.11.2023
NGRM CE Declarations of conformity 88.5 KB 2023/05/0303.05.2023
NGR Product Comparison Flyer 630.6 KB EN2022/07/1818.07.2022
NGRM700/NGRM750 Quickstarts 1.1 MB DE2022/12/0202.12.2022D00292
NGRM700/NGRM750 Quickstarts 1.4 MB EN2022/12/0202.12.2022D00292
NGRM700/NGRM750 Datasheets 1.0 MB DE2023/07/3131.07.2023D00292
NGRM700/NGRM750 Datasheets 1.0 MB FR2023/07/3131.07.2023D00292
NGRM700/NGRM750 Datasheets 1.0 MB EN2023/07/3131.07.2023D00292
NGRM700/NGRM750 Datasheets 1.0 MB ES2023/07/3131.07.2023D00292
NGRM700/NGRM750 Manuals 1.2 MB DE2024/02/0707.02.2024D00292
NGRM700/NGRM750 Manuals 1.2 MB EN2024/02/0707.02.2024D00292
NGRM700 Guideform Specification (US) Technical information 141.8 KB EN2020/04/3030.04.2020
NGRM700 Guideform Specifications Technical information 159.5 KB ES2020/05/2222.05.2020
NGRM…-Modbus Manuals 453.9 KB DE2022/06/0909.06.2022D00292
NGRM…-Modbus Manuals 443.2 KB EN2022/06/0909.06.2022D00292
NGRM…-Modbus Manuals 463.4 KB ES2022/06/0909.06.2022D00292
How to Size an NGR (US) Technical information 424.0 KB EN2019/05/1313.05.2019
How to size an NGR (ES) Technical information 426.7 KB ES2021/05/2626.05.2021
NGR Checklist (US) Technical information 245.3 KB EN2022/11/0707.11.2022
Guideline on NGR/Safety Ground Monitoring Technical information 234.7 KB EN2019/09/2020.09.2019
Guideline on NGRM Relay Testing Technical information 522.3 KB EN2021/10/2626.10.2021
System Grounding in the Americas, Australia, South Africa and Other Regions Application brochures 576.7 KB EN2019/05/1313.05.2019
HRG & LRG Systems (US) Product Brochures 5.2 MB EN2020/03/0505.03.2020
Neutral Grounding Resistor Monitors (US) Flyer 343.7 KB EN2020/03/2323.03.2020
Mining Product Brochures 11.7 MB ES2020/05/2222.05.2020