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.
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.
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
- 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
- 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
LINETRAXX® NGRM500 Variant(s)
| Type | Supply voltage US / Frequency range Hz | Art. No. |
|---|---|---|
| NGRM500 | AC 48…240 V, 40…70 Hz DC 48…240 V | B94013500 |
Optional Accessories for LINETRAXX® NGRM500
CD-series coupling device
| Type | Voltage Usys | Art. No. |
|---|---|---|
| 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 |
Measuring current transformer
| Type | Voltage/Current | Art. No. |
|---|---|---|
| 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 |
Voltage supply for measuring current transformers CTUB103…
| Type | max. connected measuring current transformers | Art. No. |
|---|---|---|
| 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 |
Downloads for LINETRAXX® NGRM500
| Name | Category | Size | Language | Timestamp | D-/B-Number |
|---|---|---|---|---|---|
| NGRM500 Update V4.00 | Software | 8.1 MB | 2024/04/2323.04.2024 | ||
| NGRM | CE Declarations of conformity | 88.5 KB | 2023/05/0303.05.2023 | ||
| NGR Product Comparison | Flyer | 630.6 KB | EN | 2022/07/1818.07.2022 | |
| NGRM…-Modbus | Manuals | 453.9 KB | DE | 2022/06/0909.06.2022 | D00292 |
| NGRM…-Modbus | Manuals | 443.2 KB | EN | 2022/06/0909.06.2022 | D00292 |
| How to Size an NGR (US) | Technical information | 424.0 KB | EN | 2019/05/1313.05.2019 | |
| NGRM500/NGRM550 | Datasheets | 1.2 MB | DE | 2023/06/2020.06.2023 | D00373 |
| NGRM500/NGRM550 | Quickstarts | 1.1 MB | DE | 2024/02/0707.02.2024 | D00373 |
| NGRM500/NGRM550 | Quickstarts | 1.1 MB | EN | 2024/02/0707.02.2024 | D00373 |
| NGRM500/NGRM550 | Manuals | 7.4 MB | DE | 2024/09/1818.09.2024 | D00373 |
| NGRM500/NGRM550 | Manuals | 7.4 MB | EN | 2024/09/1818.09.2024 | D00373 |
| NGRM500/NGRM550 | Datasheets | 1.2 MB | FR | 2023/06/2020.06.2023 | D00373 |
| NGRM500 Guideform Specification (US) | Technical information | 141.3 KB | EN | 2020/04/3030.04.2020 | |
| NGRM500 Guideform Specifications | Technical information | 158.7 KB | ES | 2020/05/2222.05.2020 | |
| NGRM…-Modbus | Manuals | 463.4 KB | ES | 2022/06/0909.06.2022 | D00292 |
| NGR Checklist (US) | Technical information | 245.3 KB | EN | 2022/11/0707.11.2022 | |
| Guideline on NGR/Safety Ground Monitoring | Technical information | 234.7 KB | EN | 2019/09/2020.09.2019 | |
| NGRM500 Retrofit Guide (US) | Technical information | 1.3 MB | EN | 2021/02/1010.02.2021 | |
| How to size an NGR (ES) | Technical information | 426.7 KB | ES | 2021/05/2626.05.2021 | |
| Guideline on NGRM Relay Testing | Technical information | 522.3 KB | EN | 2021/10/2626.10.2021 | |
| HRG & LRG Systems (US) | Product Brochures | 3.6 MB | EN | 2024/01/0303.01.2024 | |
| Neutral Grounding Resistor Monitors (US) | Flyer | 343.7 KB | EN | 2020/03/2323.03.2020 | |
| NGRM500/NGRM550 | Datasheets | 1.2 MB | EN | 2023/06/2020.06.2023 | D00373 |
| NGRM550 & NGRM750 | Flyer | 630.6 KB | EN | 2022/05/2525.05.2022 |