Generator grounding plays a crucial role in maintaining the safety, reliability, and uptime of your electrical system, especially in medium-voltage and high-availability applications. At Bender, we simplify generator grounding with advanced solutions that reduce complexity while delivering unmatched performance.
Bender recommends installing a Neutral Grounding Resistor Monitor (NGRM) on each resistor in your system. This approach reduces wiring complexity and enables dynamic control of grounding modes.
Each NGRM can be configured to switch between:
By keeping one unit in Auto Mode at all times, you ensure continuous ground-fault monitoring, even as generators are added or removed. This setup avoids inconsistencies in resistance readings and protects your system against undetected faults.
For most generator configurations, Bender recommends using an HRG series (HRG 1, HRG 2, or HRG 3). These solutions are specifically designed to:
Historically, many medium-voltage generator systems have used Low-Resistance Grounding (LRG) or hybrid grounding. If converting to HRG is not feasible for your setup, Bender still offers monitoring devices and replacement parts compatible with existing LRG and hybrid systems.
North American applications for portable or mobile power generation are often solidly grounded. Bender's RCM series ground-fault relays can be used to provide ground fault protection in such applications. In other jurisdictions, mobile power generators are left ungrounded for continuity of service in applications like construction or emergency power. For applications required to meet IEC in particular, "protective isolation with insulation monitoring and shutdown," customers often use the isoGEN423. For more information on solutions for different generators, read through our downloads section below or contact us.
Monitor Ground-Path Continuity
Current based ground-fault detection relies on the return path.
Enhanced Ground-Fault Protection
Non-linear loads are better protected by a relay that has wide frequency response.
Selective Coordination
Selective Coordination
Protect Generator Windings
Resistance grounding limits the amount of damage to the generator.
Contact Bender today to speak with an expert and find the right HRG or insulation monitoring solution for your application.
| Name | Category | Size | Language | Timestamp | D-/B-Number |
|---|---|---|---|---|---|
| How to Size an NGR (US) | Technical Information | 424.0 KB | EN | 2019/05/1313.05.2019 | |
| HRG & LRG Systems (US) | Product Brochures | 3.6 MB | EN | 2024/01/0303.01.2024 | |
| 2020 Guidelines (US) | Technical Information | 1.9 MB | EN | 2020/06/1515.06.2020 | |
| Overview Brochure | Product Overviews | 10.3 MB | EN | 2023/10/0202.10.2023 | |
| 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 |
Products
Insulation monitoring device for unearthed AC, AC/DC and DC systems (IT systems) up to 3(N)AC, AC 400 V, DC 400 V
Ground-fault detector for ungrounded AC/DC systems
Monitor for use in high-resistance grounded systems
Monitor for use in high-resistance grounded systems
AC/DC ground-fault monitor
AC/DC ground-fault monitor
Insulation monitoring device for unearthed AC, AC/DC and DC systems (IT systems) up to 3(N)AC, AC 400 V, DC 400 V
Ground-fault detector for ungrounded AC/DC systems
Monitor for use in high-resistance grounded systems
Monitor for use in high-resistance grounded systems
AC/DC ground-fault monitor
AC/DC ground-fault monitor
National Electrical Code
Canadian Electrical Code