What is a Neutral Grounding Resistor (NGR)?

A Neutral Grounding Resistor (NGR) is a protective device used in electrical power systems to safely limit earth fault currents to predefined levels. By introducing controlled resistance between the system neutral and ground, it prevents excessive fault currents that can damage equipment and compromise system stability.

​NGR systems play a critical role in enhancing operational safety, reducing arc-flash energy and ensuring reliable performance of protection relays. They are widely used in medium and high voltage networks where controlled grounding is essential for maintaining system integrity. With robust construction and high thermal withstand capability, NGR solutions provide dependable performance even under severe fault conditions.

• Limits earth fault current to safe and controlled levels
  
• Enhances personnel safety and reduces arc-flash risk
  
• Protects transformers, generators and critical equipment
  
• Ensures reliable operation of protection relays
  
• Designed for medium and high voltage applications
  
• Provides stable and secure system grounding

Neutral Grounding Resistor (NGR) | Fault Current Limiting Solutions

Key Features

Engineered to safely limit earth fault currents, enhance system protection and ensure reliable grounding performance in medium and high voltage networks.

Controlled Fault Current Limitation

Limits earth fault current to predefined safe levels, preventing excessive damage to electrical systems and equipment.

Enhanced System Safety

Improves personnel safety by reducing arc-flash energy and maintaining controlled grounding conditions during faults.​​

Protection of Critical Equipment

Safeguards transformers, generators and switchgear from high fault currents and electrical stress.​​
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High Thermal Withstand Capability for Fault Conditions

Designed to handle high fault currents for specified durations with reliable thermal performance.
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Robust & Corrosion-Resistant Design

Constructed with durable materials for long service life in harsh industrial and outdoor environments.
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Flexible Installation & Smart Monitoring

Supports indoor/outdoor installation with optional current monitoring, alarm systems and remote integration.

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Why Use a Neutral Grounding Resistor?

Modern electrical systems require effective protection against earth fault conditions to ensure safe and reliable operation. A Neutral Grounding Resistor (NGR) provides controlled fault current limitation, preventing excessive damage to equipment and minimizing operational risks. By limiting ground fault currents to predefined levels, NGR systems enhance personnel safety, reduce arc-flash energy and ensure proper operation of protection relays. This results in improved system stability and faster fault detection in medium and high voltage networks. Designed for demanding industrial environments, NGR solutions offer robust construction, high thermal withstand capability and long service life. They are widely used in substations, industrial plants, generator systems and critical infrastructure where safe grounding and reliable protection are essential.

Controlled Fault Current | Enhanced Safety | Reliable Grounding

Applications

• Power substations
• Medium & high voltage networks
• Industrial plants • Generator systems
• Transformer neutral grounding
• Electrical distribution systems

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• Renewable energy power plants
• Oil & gas facilities
• Mining operations
• Data centers
• Airports & infrastructure systems
• Critical industrial applications

TECHNICAL SPECIFICATIONS

Detailed technical specifications of Neutral Grounding Resistor (NGR) systems, engineered for controlled
​fault current limitation, enhanced system protection and reliable grounding performance.

Parameter	Specification
System Voltage	Up to 110 / √3 kV
Fault Current	Up to 5,000 A
Fault Duration	5 s, 10 s or continuous duty
Resistance Value	Custom designed according to system requirements
Current Limitation Type	Controlled earth fault current limitation
Cooling Method	Natural Air / Forced Air / Liquid (Optional)
Material​	Stainless steel resistor elements
Thermal Performance	High thermal withstand capability
Monitoring	Integrated current transformer (CT) for fault detection
Alarm & Protection	Optional monitoring and alarm integration
Enclosure Protection	IP23 / IP54 / IP55
Installation	Indoor / Outdoor (Containerized optional)
Control Modes	Manual / Automatic / Remote
Standards	Compliant with international standards
Customization	Fully customizable based on voltage, fault current and project requirements

Neutral Grounding Resistor (NGR) Technical Datasheets

Download Technical Datasheet

neutral_grounding_resistor.pdf
File Size:	2902 kb
File Type:	pdf

Download File

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Request a Quote

Looking for a customized Neutral Grounding Resistor (NGR) solution for your project?

​Our engineers will help you design a reliable and fully compliant grounding system tailored to your voltage, fault current and application requirements.

Request Quote

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Why Mak Plus Power Systems?

Mak Plus Power Systems is a trusted manufacturer of advanced electrical protection and grounding solutions, delivering high-performance Neutral Grounding Resistor (NGR) systems for industrial and energy applications worldwide. Combining German engineering standards with robust industrial design, our solutions ensure maximum safety, reliability and long-term operational performance.

​We specialize in designing and manufacturing customized NGR systems that provide controlled fault current limitation and enhanced system protection. Our solutions are engineered for demanding environments such as power substations, industrial plants, renewable energy systems and critical infrastructure where safe grounding and uninterrupted operation are essential. With flexible configurations and project-specific design capabilities, Mak Plus Power Systems delivers reliable, durable and future-ready grounding solutions.

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