NGR Monitor

NGRM700
Neutral Grounding
Resistor Monitor

Are you concerned with the reliability of your system grounding? The NGRM700 is
a sophisticated device that allows continuous NGR monitoring to provide peace of
mind that the power system grounding is intact.
The NGRM700 neutral grounding resistor monitor measures the resistance of the
NGR for High Resistance Grounded Systems (HRG). Its monitoring capabilities
include NGR current, voltage and continuity, phase-to-ground voltage. The ideal
relay to protect the grounding system and to provide main or backup ground-fault
detection. The relay can connect to a communications network and stores data
onboard for local or remote viewing.
The NGRM700 allows the user to meet their local code requirements including the
proposed 2018 CSA Section 10-302 - which requires detection of a ground fault on
the conductor connecting the NGR to the source and of loss of continuity of the
impedance grounding circuit for any impedance-grounded circuit used.
The better tool
to monitor
grounding resistors

Early detection enhances operational
safety and maintenance planning
Resistance-grounded systems use current
transformer based ground-fault detection.
An open grounding resistor renders these
systems inoperable. Early detection of
an NGR problem provides the ability to
plan repair and indicates a previously
unknown hazard.
The NGRM700 allows using already
existing CTs and coupling devices for
more easy retrofit on site.
Interfaces
·· Multilingual user interface
·· Web server with 1000 event data log;
date and time stamped event recorder
·· Modbus TCP
·· LCD user interface
Features
·· Monitoring of systems up to 25 kV
·· Phase voltage and neutral voltage
monitoring for fault indication
·· AC and DC NGR current measurement
·· Direct connection up to 690 V for
phase-voltage monitoring
·· Continuous NGR monitoring and CT
monitoring
·· Measurement of resistor value
indication in Ω
·· Harmonic analysis of NGR current and
voltage

Confidence in
grounding and
analytical
information on system
harmonics

Web server
All NGRM700 relays feature communications and allow viewing of information via
an integrated web server. This enables information display and setting adjustment on
a PC or a mobile device.
Interfaces
The integrated Ethernet interface supports data exchange within the Bender
product portfolio (BCOM) and with third-party devices or software packages
(Modbus TCP). Configurable analog outputs allow easy exchange of status information
or measured values.
Harmonic Analysis of NGR Current and Voltage
• Monitor systems with variable-frequency drives, power conversion, etc.
• Bar-graph spectrum analysis on HMI display (I and V) and comms output
• Ground-fault response to RMS, fundamental, or selectable frequency range;
AC and DC ground-fault detection
System Settings
The device can be adapted to the customer-specific application by setting all
relevant parameters. The customer can choose between different trip options, i.e.
on which signal the device should trip, either on RMS, Fundamental or Harmonic
window. After setting all relevant parameters the device will perform a calibration
on the installation to achieve the maximum accuracy.
HRG System
R(an)
268 /10k40k /10k
1.Vsys(L-L):
2.Frequency:
3.I NGR nom:
4.R NGR nom:
6.1
268
1A
50Hz
400V
Trip Signal
o RMS
o Fundamental
o Harmonics
6.5.10 Field Calibration
Start field
calibration?
System will be
shut down!
StartStop
6.7HRG System
R(an)
268 /10k40k /10k
1.Vsys(L-L):
2.Frequency:
3.I NGR nom:
4.R NGR nom:
6.1
268
1A
50Hz
400V
Trip Signal
o RMS
o Fundamental
o Harmonics
Start field
calibration?
System will be
shut down!
StartStop
6.7HRG System
R(an)
268 /10k40k /10k
1.Vsys(L-L):
2.Frequency:
3.I NGR nom:
4.R NGR nom:
6.1
268
1A
50Hz
400V
Trip Signal
o RMS
o Fundamental
o Harmonics
Start field
calibration?
System will be
shut down!
StartStop
6.7

Choose your
installation method

The NGRM700 offers two HMI mounting options (FP200-NGRM):
• The FP200-NGRM HMI mounted in the NGRM700 chassis
• The display can be easily detached for mounting in a front panel
The display unit FP200-NGRM is mounted through a door using plastic tabs or the
screw mounting hardware. It is connected via a provided RJ45 connection cable to
the NGRM700. This installation variant makes it possible to install the display of the
device in the control cabinet front without having to order any additional parts.

Fast and accurate
fault location
during operation

Fast and easy ground-fault location
The NGRM indicates ground-fault occurence and phase voltages. When a fault occurs
it can be used to activate a pulsing ground-fault location system. Combining the
NGRM700 with RCMS multi-channel ground-fault relays can provide a quick method
of determining the location of the fault.
No matter what the system size add additional RCMS units to provide quick indication
of the faulted feeder or loads and have indication of fault location before electricians
are sent to repair.
ISOSCAN®
EDS440 I L
7
6
5
3
8
4
2
0
1
6
5
3
4
2
0
1
9
8
ISOSCAN®
EDS440I L
RCMS460 versions provide indication of fault location via communications.
RCMS490 versions provide local and remote indication of fault location. Additional
single function or hand-held detectors can be used to further refine the search for
the fault. The RCMS490 output may also be used to control a local breaker if tripping
of the faulted load is preferred.

For even the
harshest
environments
Each electrical installation has its own requirements.
Increased climatic and mechanical requirements
The NGRM700 has conformally coated circuits and is suitable for extreme
operating conditions from -40 to +70 °C.
Outdoor
The conformal coating protects the device from moisture, corrosion and contami-
nation. The NGRM700 was designed to operate at an altitude where air does not have
the same insulation and heat dissipation properties as it does at sea level. Offering
unparalleled protection at any location.

Complete NGR packages can be supplied to meet your needs.
Supplier partners around the globe are available to provide system level solutions
from the simplest ground-fault relay and NGR in an enclosure to the more sophisticated
multi-feeder pulsing ground-fault location systems complete with around
2nd ground-fault protection.

Pictures: Adobe Stock (© zhu difeng, © wawritto), Bender archives.
USA, Mexico, Central America • Exton PA, USA
800.356.4266 / 610.383.9200 • info@bender.org
www.bender.org
Canada • Missisauga ON, Canada
800.243.2438 / 905.602.9990 • info@bender-ca.com
www.bender-ca.com
South America • Santiago de Chile
+59 2.2933.4211 • info@bender-latinamerica.com
www.bender-latinamerica.com

NGR Monitor

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