Why is the NGR continuously monitored in an HRG system?
This model is intended for LRG applications. The guide explains NGR monitoring through an HRG example; LRG-specific operating limits are in the model documentation.
Read the technical guideProduct families / Neutral grounding resistor monitoring · NGR / LINETRAXX® NGRM550
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Bender LINETRAXX® NGRM550LRG Neutral Grounding Resistor Monitoring
Device monitoring neutral grounding resistance, current and voltage in low-resistance-grounded LRG systems.
TECHNICAL SUMMARY
Features and intended use.
LRG Neutral Grounding Resistor Monitoring
- Designed for LRG systems; differs from the HRG scope of NGRM500.
- Active and passive resistance measurement methods.
- NGR resistance monitoring even when the installation is de-energised.
- Ethernet, web server, analogue output and event memory.
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MODEL, ORDER AND ACCESSORY INFORMATION
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Model options and technical values
| Model | Supply voltage U S / Frequency range Hz | Order code |
|---|---|---|
| NGRM550 | AC 48…240 V, 40…70 Hz / DC 48…240 V | B94013550 |
Explore compatible accessories
Compatible accessories · 1
| Model | Voltage U sys | Order code |
|---|---|---|
| CD1000 | 400…690 V | B98039010 |
| CD1000-2 | 400…1000 V | B98039053 |
| CD5000 | 1000…4200 V | B98039011 |
| CD14400 | 4300…14550 V | B98039054 |
| CD25000 | 14551…25000 V | B98039055 |
Manufacturer table notes (original language):
Measuring current transformer
Compatible accessories · 2
| Model | Voltage / current | Order code |
|---|---|---|
| CTAC35 / CTAC60 / CTAS50 / CTAS80 / CTAS120 | AC up to 30 A | B98110007 / B98110017 / B98110009 / B98110010 / B98110011 |
| CTUB103-CTBC35 | AC/DC up to 10 A | B78120030 |
| CTUB103-CTBC60 / CTUB103-CTBC120 | AC/DC up to 25 A | B78120031 / B78120032 |
| CTB31…CTB51 series | AC > 30…1000 A | B980860xx |
Manufacturer table notes (original language):
Voltage supply for measuring current transformers CTUB103…
Compatible accessories · 3
| Model | Maximum number of connectable measuring current transformers | Order code |
|---|---|---|
| STEP-PS/1 AC/24 DC/0.5 | 2 | B94053110 |
| STEP-PS/1 AC/24 DC/1.75 | 7 | B94053111 |
| STEP-PS/1 AC/24 DC/4.2 | 17 | B94053112 |
Based on tables on the manufacturer's current product page. For marked-value footnotes, connection conditions and variant suitability, review Bender product source ↗ and the technical documents together. Listing an order code does not commit to stock availability or delivery time.
BENDER MANUFACTURER DOCUMENTS
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5 / 5 documents
Datasheet
NGRM500/NGRM550
NGRM5xx_D00373_D_XXEN.pdfTechnical summary source · pp. 1, 2Open document ↗Operating manualNGRM500/NGRM550
NGRM5xx_D00373_M_XXEN.pdfOpen document ↗Operating manualNGRM…-Modbus
NGRMx_D00292_A_XXEN.pdfOpen document ↗Quick startNGRM500/NGRM550
NGRM5xx_D00373_Q_XXEN.pdfOpen document ↗BrochureNGRM550 & NGRM750
NGRM550_NGRM750_Flyer.pdfOpen document ↗No documents match your search. Change the search or document type.
About manufacturer sources
This summary is based on product and application information on the specified document pages. Consult the relevant document for complete technical values, connection conditions and ordering options.
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Data sheets, operating manuals and related manufacturer documents. File names identify the model or accessory; documents retain their original language.
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APPLICATION
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For resistance-grounded systems, HRG/LRG classification is evaluated together with voltage, NGR resistance and current measurement conditions.
IN THE SAME PRODUCT FAMILY
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