LINETRAXX® NGRM500
The NGRM500 Neutral Grounding Resistor Monitor detects grounding-resistor failures and ground faults. It is intended for use in high-resistance grounded transformers and generators used in commercial and industrial power systems. In these systems, the NGRM500 monitors:
- Current through the neutral-grounding resistor (NGR)
- Voltage between the star point of the transformer and ground (voltage drop across the NGR)
- NGR failure (open and short), including failure of connections between neutral and ground
The NGRM500 can display the measured values, including current and voltage harmonics on the human machine interface (HMI). Users are able to select filters for ground-fault current and NGR voltage to prevent nuisance operation in noisy applications. A benefit to many users is the multilingual user interface that allows the comfort of reading values and programming in your native language.
It is a compact design with DIN rail mounting making it easy to retrofit into existing HRG applications or factory-install in new HRG packages. If customers prefer, they can easily program the relay via the built-in webserver. NGRM500’s can easily connect to a supervisory system with Modbus TCP/IP or RTU communications. Capabilities extend to 25 kV and 100 A.
The NGRM500 allows the user to meet Canadian requirements. It can be used to perform the functions required by Rule 10-302, Use of Impedance Grounded Systems, of the CE Code, C22.1-18, Section 10, Grounding and Bonding.
The NGRM500 Neutral Grounding Resistor Monitor detects grounding-resistor failures and ground faults. It is intended for use in high-resistance grounded transformers and generators used in commercial and industrial power systems. In these systems, the NGRM500 monitors:
- Current through the neutral-grounding resistor (NGR)
- Voltage between the star point of the transformer and ground (voltage drop across the NGR)
- NGR failure (open and short), including failure of connections between neutral and ground
The NGRM500 can display the measured values, including current and voltage harmonics on the human machine interface (HMI). Users are able to select filters for ground-fault current and NGR voltage to prevent nuisance operation in noisy applications. A benefit to many users is the multilingual user interface that allows the comfort of reading values and programming in your native language.
It is a compact design with DIN rail mounting making it easy to retrofit into existing HRG applications or factory-install in new HRG packages. If customers prefer, they can easily program the relay via the built-in webserver. NGRM500’s can easily connect to a supervisory system with Modbus TCP/IP or RTU communications. Capabilities extend to 25 kV and 100 A.
The NGRM500 allows the user to meet Canadian requirements. It can be used to perform the functions required by Rule 10-302, Use of Impedance Grounded Systems, of the CE Code, C22.1-18, Section 10, Grounding and Bonding.
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 | ||
| NGR Product Comparison | Flyers | 630.6 KB | EN | 2022/07/1818.07.2022 | |
| NGRM | CE Declarations of Conformity | 88.5 KB | 2023/05/0303.05.2023 | ||
| 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 | Quickstarts | 1.1 MB | EN | 2024/02/0707.02.2024 | D00373 |
| NGRM500/NGRM550 | Manuals | 7.4 MB | EN | 2024/09/1818.09.2024 | D00373 |
| NGRM500 Guideform Specification (US) | Technical Information | 141.3 KB | EN | 2020/04/3030.04.2020 | |
| 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 | |
| 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) | Flyers | 343.7 KB | EN | 2020/03/2323.03.2020 | |
| NGRM500/NGRM550 | Datasheets | 1.2 MB | EN | 2023/06/2020.06.2023 | D00373 |
| NGRM550 & NGRM750 | Flyers | 630.6 KB | EN | 2022/05/2525.05.2022 |
