Safety instructions
12
NGRM7xx_D00292_07_M_XXEN/02.2022
2.3 Intended use
The NGRM700 is only intended for use in high-resistance grounded systems. The
NGRM750 is only intended for use in low-resistance grounded systems.
In these systems, the NGRM7… monitors
the current through the neutral grounding resistor (NGR),
the voltage between the star point of the transformer and ground (voltage drop
across the NGR),
the condition of the neutral grounding resistor (NGR),
line-to-line and line-to-ground voltages.
In order to meet the requirements of applicable standards, customised parameter set-
tings must be made on the equipment in order to adapt it to local equipment and op-
erating conditions. Please heed the limits of the range of application indicated in the
technical data.
Any other use than that described in this manual is regarded as improper. Intended use
includes following all the instructions in this manual.
Systems with a resistance-grounded star point can be used when an inter-
ruption of the power supply would involve excessive costs due to
production stoppage (e.g. automotive production, chemical industry).
The ground fault that occurs between a phase and ground does not lead
to a failure of the power supply in these systems. A ground fault must be
detected and eliminated as quickly as possible, since the occurrence of an-
other ground fault in a second phase would lead to a tripping of the over-
current protective device.
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