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  1. Products
  2. Resistance Grounded Systems (HRG/LRG)
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LINETRAXX® NGRM500

LINETRAXX® NGRM500

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.

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  • Features
  • Accessories
  • Ordering information
  • Downloads
  • 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 (24 to 240 Vac/Vdc)
  • 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

Optional accessories for LINETRAXX® NGRM500

CD-series coupling device
Voltage UsysTypeArt. No.
400…690 VCD1000B98039010
400…1000 VCD1000-2B98039053
1000…4200 VCD5000B98039011
4300…14550 VCD14400B98039054
14551…25000 VCD25000B98039055


Measuring current transformer
Voltage/CurrentTypeArt. No.
AC up to 10 AW20 B98080003
AC up to 25 AW35
W60
W0-S20
W1-S35
W2-S70		B98080010
B98080018
B911787
B911731
B911732
AC/DC up to 10 AW35AB
W60AB
W120AB
CTUB103-CTBC35		B98080016
B98080026
B98080041
B78120030
AC/DC up to 25 ACTUB103-CTBC60
CTUB103-CTBC120		B78120031
B78120032


Voltage supply for measuring current transformers W…
TypeSupply voltageArt. No.*
AN420AC 100…250 V, 50/60 Hz, DC 100…250 VB74053100
B94053100
*(B7… = push-wire terminal / B9… = screw-type terminal)


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

Variants of LINETRAXX® NGRM500


TypeSupply voltage US/
Frequency range Hz		Art. No.
NGRM500AC 48…240 V, 40…70 Hz
DC 48…240 V		B94013500

Downloads for LINETRAXX® NGRM500

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