How to Select the Right Neutral Grounding Resistor (NGR) in 3 Steps

Writer： admin Time：2026-09-30 10:06:14 Browse：90℃

Selecting the right neutral grounding resistor (NGR) is essential for limiting single-line-to-ground fault current and maintaining a controlled grounding condition in medium-voltage power systems.

However, NGR selection involves more than choosing a resistance value. The system voltage, neutral configuration, grounding method, fault current, fault duration, insulation level, installation environment, and protection requirements must all be considered.

A practical NGR selection process can be divided into three steps: Define the system parameters, Select the grounding method and calculate the NGR resistance, Verify thermal, insulation, enclosure, and monitoring requirements.

This approach helps ensure that the NGR is properly matched to the electrical system and the actual operating conditions.

Step 1: Define the System Parameters

Before selecting an NGR, collect the basic electrical and environmental parameters of the installation.

1. Confirm the System Voltage

The first parameter is the system line-to-line voltage. Common medium-voltage systems include 3.3 kV, 6.6 kV, 10 kV, 11 kV, 13.8 kV, 22 kV, 33 kV and 35 kV.

However, the NGR is connected between the system neutral point and ground, so the voltage across the resistor during a ground fault is generally related to the system phase-to-neutral voltage rather than the line-to-line voltage.

For a solidly balanced three-phase system: Vphase = Vline / √3

For example, for a 35 kV system: Vphase = 35,000 / √3 ≈ 20,208 V

This value is important when calculating the resistance required to limit the ground-fault current.

2. Confirm the Ground-Fault Current

The required NGR current should be determined from the grounding philosophy and protection requirements of the system.

For a resistance-grounded system, the approximate relationship is: R = Vphase / If

Where R stands for NGR resistance in ohms, Vphase stands for system phase-to-neutral voltage, and If stands for desired ground-fault current.

For example, if a 35 kV system requires a 50 A ground-fault current: R = 20,208 / 50 ≈ 404 Ω. Therefore, the preliminary NGR resistance is approximately 404 Ω.

This is a preliminary electrical calculation. The final NGR rating should also consider system capacitance, fault protection, resistor tolerance, temperature coefficient, and the specified fault duration.

3. Confirm the Fault Duration

The NGR must withstand the specified fault current for the required duration. Typical project requirements may include 5 s, 10 s, 30 s, 60 s and 120 s.

The actual duration should not be selected simply according to a general rule. It should correspond to the protection scheme and the time required for the relevant circuit breaker or protection system to clear the fault.

The NGR thermal design must therefore be based on the actual combination of fault current, resistance, fault duration and ambient conditions.

4. Confirm the Installation Environment

Environmental parameters are also important, particularly for outdoor or high-altitude NGR installations. Manufacturers need to confirm installation altitude, ambient temperature, indoor or outdoor installation, relative humidity, pollution level, corrosive environment, seismic requirements and enclosure protection requirements.

For high-altitude installations, the manufacturer may need to verify insulation coordination, heat dissipation, and component altitude ratings.

Step 2: Select the Grounding Method and NGR Current

The grounding method determines how the NGR interacts with the power system during a single-line-to-ground fault.

High-Resistance Grounding (HRG)

High-resistance grounding uses a relatively high resistance to limit ground-fault current to a low level. The actual current is normally selected by considering the system's total charging current and the required grounding philosophy.

In many HRG systems, the resistor current is selected so that it is sufficiently higher than the system capacitive charging current to establish a controlled resistive ground-fault current.

Typical applications include industrial plants, process facilities, data centers, mining systems and motor-heavy distribution networks, which require continuous power operation.

The protection philosophy may allow a ground fault to remain temporarily while an alarm identifies the faulted circuit. However, the permissible operating time depends on the system design, applicable standards, and local electrical requirements.

Low-Resistance Grounding (LRG)

Low-resistance grounding uses a lower resistance to permit a higher ground-fault current. The higher fault current allows protection relays and circuit breakers to detect and clear the fault rapidly.

LRG is commonly used in medium-voltage industrial distribution, utility substations, petrochemical facilities and large commercial and industrial plants that require fast ground-fault clearing.

There is no single universal current range that defines all LRG applications. The required current must be determined from the system design, protection coordination, equipment withstand capability, and project specifications.

Other Grounding Configurations

Some systems combine grounding transformers, neutral grounding resistors, reactors, or other grounding components. For example, a grounding transformer may be used to create an artificial neutral point on an otherwise ungrounded or delta-connected system. The NGR can then be connected between the grounding-transformer neutral and ground.

For networks with substantial cable capacitance, other grounding technologies such as grounding reactors or arc-suppression equipment may also be considered. The correct configuration depends on the network topology and grounding philosophy rather than simply the nominal system voltage.

NGR Grounding Method Comparison

Grounding Method	Typical Objective	Key Design Consideration	Typical Applications
High-Resistance Grounding	Limit ground-fault current to a low level	Charging current, fault detection and alarm strategy	Industrial plants, process systems, data centers
Low-Resistance Grounding	Limit fault current while enabling fast protection	Fault current, relay coordination and equipment withstand	MV industrial systems, substations
Grounding Transformer + NGR	Create a neutral point and limit ground-fault current	Transformer rating, neutral voltage and NGR duty	Delta or systems without an accessible neutral
Reactor-Based Grounding	Compensate system capacitive current	Network capacitance and tuning	Cable-dominated MV networks

For NGR applications, the applicable standards should be identified based on the equipment and project. IEC 60076-25:2023 is directly relevant to neutral grounding resistors for transformers and generators, while IEEE Std 32 provides important requirements for neutral grounding devices.

Step 3: Verify NGR Thermal, Insulation, and Protection Requirements

Once the system voltage, grounding method, fault current, and fault duration are defined, the NGR design must be checked against the actual operating conditions.

1. Verify the Resistor Element

NGR resistor elements may use different alloys and construction methods depending on the current, resistance, duty cycle, temperature rise, corrosion requirements, and mechanical design.

Resistor Material	Main Characteristics	Typical Considerations
Stainless Steel	Good corrosion resistance and mechanical strength	Outdoor and industrial environments
Ni-Cr Alloy such as Cr20Ni80	Good high-temperature performance and resistance stability	High-temperature resistor applications
Fe-Cr-Al Alloy	High-temperature capability and oxidation resistance	High-temperature resistor elements
Metal Oxide	Nonlinear voltage-current characteristics	Used for specific overvoltage or grounding applications rather than conventional linear NGR duty

The resistor material should not be selected only by its maximum material temperature. The manufacturer should also consider surface loading, element geometry, resistance tolerance, temperature coefficient of resistance, short-time thermal capacity, mechanical expansion, oxidation environment and cooling method.

For example, Cr20Ni80 does not have a perfectly constant resistance. Its resistance changes with temperature, so the resistance value and tolerance should be specified at the applicable reference temperature.

2. Verify Short-Time Thermal Performance

NGRs normally operate under a specified short-time fault duty rather than continuous full-load operation. The manufacturer should verify rated ground-fault current, rated resistance, fault duration, initial resistor temperature, ambient temperature, temperature rise, maximum allowable element temperature and cooling conditions.

The thermal design should demonstrate that the resistor can withstand the specified duty without unacceptable deformation, insulation deterioration, or damage.

3. Verify Insulation Level

The NGR's insulation design should be evaluated separately from the resistor's thermal characteristics. Key evaluation parameters include power-frequency withstand voltage, lightning impulse withstand level, phase-to-ground clearance, phase-to-phase clearance, creepage distance, insulator rating and installation altitude.

The required insulation level should be determined from the system voltage and applicable insulation coordination requirements. It is better to specify the NGR using the complete insulation requirements rather than simply describing a product as a “12 kV insulation class” or “36 kV insulation class.”

4. Verify Enclosure Protection

The enclosure should be selected according to the actual installation environment. Core considerations include indoor or outdoor installation, IP protection grade, NEMA enclosure classification, ventilation performance, corrosion protection, rain and dust resistance, condensation resistance, ambient temperature adaptability and cable entry arrangement.

For example, an outdoor NGR may require an enclosure such as IP54 or another project-specified protection level. The correct rating should be determined from the site environment rather than applying one IP rating to all NGRs.

For hazardous locations, the complete equipment configuration must satisfy the applicable hazardous-area requirements. ATEX or IECEx certification should only be specified when required by the installation classification and when the complete equipment is appropriately certified.

Intelligent NGR Monitoring and Protection

Modern NGR systems can incorporate monitoring and communication functions to improve fault detection and maintenance. Depending on the project, an intelligent NGR monitoring system may measure normal zero-sequence current, ground-fault current, ground-fault duration, resistor temperature, enclosure temperature, ambient humidity, grounding resistor condition, alarm status and number of fault operations.

Communication interfaces such as RS-485/Modbus may be provided for connection to a plant monitoring or SCADA system. It is worth noting that protection thresholds cannot adopt universal fixed values. These parameters must be determined from the specific NGR design, resistor material, thermal limits, CT characteristics, protection philosophy, and project requirements.

Example: Selecting an NGR for a 35 kV Mining Substation

Take a 35 kV mining substation as an example, with core parameters as follows: system voltage 35 kV, frequency 50 Hz, desired ground-fault current 50 A, low-resistance grounding method, fault duration 10 s.

Step 1: Calculate the phase voltage. For a 35 kV line-to-line system, Vphase = 35,000 / √3 ≈ 20,208 V.

Step 2: Calculate the preliminary NGR resistance. According to the formula R = Vphase / If, the preliminary NGR resistance is approximately 404 Ω.

Step 3: Verify the complete NGR design. The final specification should not only confirm 404 Ω and 50 A rating, but also verify 35 kV system insulation requirements, 10 s short-time thermal duty, resistor temperature rise, resistance tolerance and temperature coefficient, installation altitude adaptability, enclosure protection grade, CT parameters, monitoring communication functions and compliance with IEC and IEEE standards. For mining scenarios, corrosion resistance, mechanical protection and dustproof performance need targeted optimization.

What Information Should You Provide When Requesting an NGR Quote?

To obtain an accurate NGR quotation, provide complete project parameters including electrical parameters, installation conditions, protection and monitoring requirements, as well as standards and certification requirements.

Electrical parameters cover system voltage, frequency, ground-fault current, resistance value (if confirmed), fault duration and system neutral configuration. Installation conditions include installation altitude, indoor/outdoor type, ambient temperature, humidity and pollution/corrosion conditions. Protection and monitoring requirements contain CT ratio, protection relay logic, local indication, remote SCADA communication and alarm rules. Certification requirements include specified IEC, IEEE and local industry standards, as well as third-party certification requirements.

Providing complete parameters in the early stage enables manufacturers to customize accurate and reliable NGR solutions for specific project scenarios.

Conclusion: A Practical 3-Step NGR Selection Process

Selecting the right neutral grounding resistor can be standardized into three practical steps. First, define core system parameters, including system voltage, neutral configuration, fault current, fault duration, altitude and ambient operating conditions. Second, select a reasonable grounding method, calculate the preliminary resistance value based on phase voltage and target fault current, and calibrate with the overall system protection design. Third, verify the full-set design, covering resistor material thermal stability, system-matched insulation level, environmental adaptability of enclosure, and intelligent monitoring functions.

A qualified NGR is not a single fixed-resistance component, but a professional engineered system that perfectly matches the system voltage, fault characteristics, insulation standards, site environment and protection strategy, ensuring long-term safe and stable operation of medium-voltage power systems.

resistors, reactors, or other grounding components. For example, a grounding transformer may be used to create an artificial neutral point on an otherwise ungrounded or delta-connected system. The NGR can then be connected between the grounding-transformer neutral and ground."},"attribs":{"0":"*0*1+9f"},"rows":{},"cols":{}}},"type":"text"}},"CH69fnWiMdiuidcs62EcmyBJnwb":{"id":"CH69fnWiMdiuidcs62EcmyBJnwb","snapshot":{"align":"left","author":"7584151683836431565","children":[],"comments":[],"hidden":false,"locked":false,"parent_id":"ChRkddeHWobhoHxlB86c2iMPntd","revisions":[],"text":{"apool":{"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true}"],"1":["author","7584151683836431565"]},"nextNum":2,"attribToNum":{"ai-extra,{\"is_ai_gen\":true}":0,"author,7584151683836431565":1}},"initialAttributedTexts":{"text":{"0":"For networks with substantial cable capacitance, other grounding technologies such as grounding reactors or arc-suppression equipment may also be considered. 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It is worth noting that protection thresholds cannot adopt universal fixed values. These parameters must be determined from the specific NGR design, resistor material, thermal limits, CT characteristics, protection philosophy, and project requirements."},"attribs":{"0":"*0*1+a9"},"rows":{},"cols":{}}},"type":"text"}},"Aqy6fUNBwdqanFcyRsscs7bBnvg":{"id":"Aqy6fUNBwdqanFcyRsscs7bBnvg","snapshot":{"align":"left","author":"7584151683836431565","children":[],"comments":[],"hidden":false,"locked":false,"parent_id":"ChRkddeHWobhoHxlB86c2iMPntd","revisions":[],"text":{"apool":{"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true}"],"1":["author","7584151683836431565"]},"nextNum":2,"attribToNum":{"ai-extra,{\"is_ai_gen\":true}":0,"author,7584151683836431565":1}},"initialAttributedTexts":{"text":{"0":"Example: Selecting an NGR for a 35 kV Mining Substation"},"attribs":{"0":"*0*1+1j"},"rows":{},"cols":{}}},"type":"heading2"}},"NQlOfsOm6dob70c8w1lcMng1n0e":{"id":"NQlOfsOm6dob70c8w1lcMng1n0e","snapshot":{"align":"left","author":"7584151683836431565","children":[],"comments":[],"hidden":false,"locked":false,"parent_id":"ChRkddeHWobhoHxlB86c2iMPntd","revisions":[],"text":{"apool":{"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true}"],"1":["author","7584151683836431565"]},"nextNum":2,"attribToNum":{"ai-extra,{\"is_ai_gen\":true}":0,"author,7584151683836431565":1}},"initialAttributedTexts":{"text":{"0":"Take a 35 kV mining substation as an example, with core parameters as follows: system voltage 35 kV, frequency 50 Hz, desired ground-fault current 50 A, low-resistance grounding method, fault duration 10 s."},"attribs":{"0":"*0*1+5q"},"rows":{},"cols":{}}},"type":"text"}},"KMhZf7I7wd1Rv8c6sA5cJuZGnzc":{"id":"KMhZf7I7wd1Rv8c6sA5cJuZGnzc","snapshot":{"align":"left","author":"7584151683836431565","children":[],"comments":[],"hidden":false,"locked":false,"parent_id":"ChRkddeHWobhoHxlB86c2iMPntd","revisions":[],"text":{"apool":{"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true}"],"1":["author","7584151683836431565"]},"nextNum":2,"attribToNum":{"ai-extra,{\"is_ai_gen\":true}":0,"author,7584151683836431565":1}},"initialAttributedTexts":{"text":{"0":"Step 1: Calculate the phase voltage. 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Installation conditions include installation altitude, indoor/outdoor type, ambient temperature, humidity and pollution/corrosion conditions. Protection and monitoring requirements contain CT ratio, protection relay logic, local indication, remote SCADA communication and alarm rules. 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