Neutral Grounding Resistor
Our product range includes a wide range of neutral grounding resistor with vc panel, neutral earthing resistor, formed stainless steel (fss grid) type neutral grounding resistor, punched grid type ngr, punched patti grid type ngr and 22 kv neutral grounding resistor.
Neutral Grounding Resistor With VC Panel
Request Callback
₹ 350000 / Unit Get Latest Price
| Resistance Value | Depends on Current |
| Usage/Application | Generators |
| Mounting type | Through Hole |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V - 33kV |
| Brand | National Resistors |
| Material | AISI 304 / AISI 430/AISI-406 |
| Surface Treatment | Soft & annealed |
NGR & VC Panel normally consist of two separate cubicles attached to each other. The Resistance cubicle consists of number of Resistance Banks (Tiers) mounted one on top other and supported on HT Insulators. The enclosure is fitted with covers, provided with louvers and wiremesh. A Space Heater is provided to prevent condensation of moisture.
This Type of system is used for Parallel operating Generators in which all VC's are interlocked with each other and at a time only one VC is connected to NGR. In such system one comman NGR is used for multiple Generators.
The NIS Cubicle houses the Isolating Switch (Vacuum Contactor) and CTs, as desired.LT Terminal Box for housing Thermostat and MCB, ON / OFF indicating lamps & LT terminals of Isolator & CTs etc. are provided in the NIS Cubicle.
This Type of system is used for Parallel operating Generators in which all VC's are interlocked with each other and at a time only one VC is connected to NGR. In such system one comman NGR is used for multiple Generators.
The NIS Cubicle houses the Isolating Switch (Vacuum Contactor) and CTs, as desired.LT Terminal Box for housing Thermostat and MCB, ON / OFF indicating lamps & LT terminals of Isolator & CTs etc. are provided in the NIS Cubicle.
Neutral Earthing Resistor
Request Callback
₹ 250000 / Unit Get Latest Price
| Resistance Value | Depends on Current |
| Usage/Application | Electrical Industry |
| Mounting type | Through Hole |
| Brand | National Resistors |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V -33kV |
| Frequency | 50 Hz |
| Installation | DIP Resistor |
| Dimensions | 1200L x 1200W x 1900H(mm) |
Neutral Earthing Resistor (NER) is used to restrict the flow of current during an earth fault on an alternate current distribution system. The resistor is connected between the neural point of a transformer and earth or generator and earth. The neutral earthing resistors (NER) offer dependable protection every time whenever there is a fault. Neutral earthing Resistor (NER) are used in power distribution, mining and industrial installations etc. The resistor is designed to tolerate most hazardous work conditions and atmospheric changes. Neutral Earthing Resistor (NER) is known for durability and reliability.
Highlights:
- Resistance value pre-determined to operate fault-clearing relays and to prevent damages
- System is designed as per to current and time ratings and compatible with the protection switch gear
- Resistance value is precise and determined and remains constant throughout life
- Made from tough steel grids of a high quality iron-chrome-aluminium
- Non-corroding and offer good stability
- Mica and ceramic insulators
- Resistor in fully protected and ventilated steel enclosures
Formed Stainless Steel (FSS Grid) Type Neutral Grounding Resistor
Request Callback
₹ 145000 / Unit Get Latest Price
| Resistance Value | Depends on Current |
| Usage/Application | Industrial |
| Mounting type | Through Hole |
| Shape | Rod Type |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V - 33kV |
| Brand | National Resistors |
| Surface Treatment | Soft & annealed |
NGR Element Material:
Advantages of This Type Elements:
Resistor Element:
NGR Enclosure Material:
Diameter Available: 4 to 12 mm
- Formed Stainless Steel Grid is one of the Type of construction of Resistor Element. This Type of Resistor elements are used in generally in cement Industy Industry and High current application.
Advantages of This Type Elements:
- High mechanical strength
- Good ability to absorb mechanical vibrations
- Resistor element to element welded connections
- Economical construction
Resistor Element:
- Material used for this type of construction are AISI-304, AISI-410 & AISI -406
NGR Enclosure Material:
- Enclosure will be provided in MS (CRCA), Aluminium, Unpainted Stainless Steel (AISI-304/316), painted Stainless Steel (AISI-304/316), Hot Dip Galvanised, Normal Galvanising as per customer requirement and thickness of enclosure will be 1.5mm -3 mm as per customer requirement
Diameter Available: 4 to 12 mm
Punched Grid Type NGR
Request Callback
₹ 150000 / Unit Get Latest Price
| Resistance Value | Depends on Current |
| Usage/Application | Mines, Steel Industry, Power plants, substations, Transformer, Generators |
| Mounting type | Through Hole |
| Shape | Sheet |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V -33kV |
| Brand | National Resistors |
| Material | AISI 304 / AISI 430 |
NGR Element Material:
Advantages of This Type Elements:
Resistor Element:
NGR Enclosure Material:
Thickness Available: 0.5 to 2 mm
- Punched Stainless Steel Grid is one of the Type of construction of Resistor Element. This Type of Resistor elements are used in generally in Oil Industry, BHEL, NTPC, Adani, EIL etc
Advantages of This Type Elements:
- Better cooling due to large surface area
- Element to Element Bolted Connections
- Easy Replacement of Elements
- Suitable for continuous rating applications
Resistor Element:
- Material used for this type of construction are AISI-304, AISI-430
NGR Enclosure Material:
- Enclosure will be provided in MS (CRCA), Aluminium, Unpainted Stainless Steel (AISI-304/316), painted Stainless Steel (AISI-304/316), Hot Dip Galvanised, Normal Galvanising as per customer requirement and thciness of enclosure will be 1.5mm -3 mm as per customer requirement
Thickness Available: 0.5 to 2 mm
Punched Patti Grid Type NGR
Request Callback
₹ 200000 / Unit Get Latest Price
| Resistance Value | Depends on current |
| Usage/Application | Cement Industry, Steel Industry, Power plants, substations, Metro, Transformer, Generators |
| Brand | National Resistors |
| Mounting type | Through Hole |
| Shape | Wire Type |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V -33kV |
NGR Element Material:
Advantages of This Type Elements:
Resistor Element:
NGR Enclosure Material:
- Patti Grid is one of the Type of construction of Resistor Element. This Type of Resistor elements are used in generally in NGR which is having High current rating i.e. 800A-1500A
Advantages of This Type Elements:
- Suitable for Higher currents & Large time rating
- Cooling is achieved better in this type of construction.
Resistor Element:
- AISI-304, AISI -430, Fe-Cr-Al (AISI-406)
NGR Enclosure Material:
- Enclosure will be provided in MS (CRCA), Aluminium, Unpainted Stainless Steel (AISI-304/316), painted Stainless Steel (AISI-304/316), Hot Dip Galvanised, Normal Galvanising as per customer requirement and thickness of enclosure will be 1.5mm -3 mm as per customer requirement
22 kV Neutral Grounding Resistor
Request Callback
₹ 250000 / Unit Get Latest Price
| Resistance Value | Depends on current |
| Usage/Application | Mines, Steel Industry, Power plants, substations, Transformer, Generators |
| Mounting type | Through Hole |
| Brand | National Resistors |
| Shape | Rod, Sheet |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Ambient Temperature | Up to 50 DegreeC (For higher ambient temperature, consult factory) |
| Current | Up to 5000 A |
Neutral Grounding Resistors (NGRs) are used to limit the fault current and ensure safety of equipment and personnel in industrial systems.
Neutral Grounding Resistor systems can be inserted between the neutral and ground in a power system to provide ground fault protection through resistance. The fundamental purpose of a Neutral Grounding Resistor (NGR) is to limit ground fault currents to safe levels so that sensitive and selective earth fault protection relay can take place and all the electrical equipment in a power system is protected. Neutral Grounding Resistors are also commonly referred to as Neutral Earthing Resistors and Earth Fault Protection Resistors
Neutral Grounding Resistor systems can be inserted between the neutral and ground in a power system to provide ground fault protection through resistance. The fundamental purpose of a Neutral Grounding Resistor (NGR) is to limit ground fault currents to safe levels so that sensitive and selective earth fault protection relay can take place and all the electrical equipment in a power system is protected. Neutral Grounding Resistors are also commonly referred to as Neutral Earthing Resistors and Earth Fault Protection Resistors
Wire Grid Type Neutral Grounding Resistor.
Request Callback
₹ 95000 / Unit Get Latest Price
| Resistance Value | Depends on Current |
| Usage/Application | Neutral Grounding of Transformer/Generator |
| Material | AISI 304 / AISI 410 / AISI 406 |
| Mounting type | Through Hole |
| Shape | Rod Type |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V -33kV |
| Surface Treatment | Soft & annealed |
NGR Element Material:
Advantages of This Type Element:
Material used for this type of construction are AISI-304, AISI -406, Ni-Cr (80-20%)
NGR Enclosure Material:
Diameter Available: 4 to 12 mm
Industry:
- Stainless Steel Wire Grid is one of the Type of construction of Resistor Element. This Type of Resistor elements are used in generally in NGR which is having small current rating i.e upto100A.
Advantages of This Type Element:
- Economical solution for low current ratings
- Resistor element is a continuous without breakage
Material used for this type of construction are AISI-304, AISI -406, Ni-Cr (80-20%)
NGR Enclosure Material:
- Enclosure will be provided in MS (CRCA), Aluminium, Unpainted Stainless Steel (AISI-304/316), painted Stainless Steel (AISI-304/316), Hot Dip Galvanised, Normal Galvanising as per customer requirement and thickness of enclosure will be 1.5mm -3 mm as per customer requirement
Diameter Available: 4 to 12 mm
Industry:
- Cement Industry, Steel Industry, Power plants, substations, Metro, Transformer, Generators
33 kV Neutral Grounding Resistor
Request Callback
₹ 350000 / Unit Get Latest Price
| Resistance Value | Depends on current |
| Usage/Application | Mines, Steel Industry, Power plants, substations, Transformer, Generators |
| Material | AISI 304 / AISI 410 / AISI 430 |
| Mounting type | Through Hole |
| Shape | Rod, Sheet, Wire |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Brand | National Resistors |
| Ambient Temperature | Up to 50 DegreeC (For higher ambient temperature, consult factory) |
Neutral Grounding Resistors (NGRs) are used to limit the fault current and ensure safety of equipment and personnel in industrial systems.
Neutral Grounding Resistor systems can be inserted between the neutral and ground in a power system to provide ground fault protection through resistance. The fundamental purpose of a Neutral Grounding Resistor (NGR) is to limit ground fault currents to safe levels so that sensitive and selective earth fault protection relay can take place and all the electrical equipment in a power system is protected. Neutral Grounding Resistors are also commonly referred to as Neutral Earthing Resistors and Earth Fault Protection Resistors
Neutral Grounding Resistor systems can be inserted between the neutral and ground in a power system to provide ground fault protection through resistance. The fundamental purpose of a Neutral Grounding Resistor (NGR) is to limit ground fault currents to safe levels so that sensitive and selective earth fault protection relay can take place and all the electrical equipment in a power system is protected. Neutral Grounding Resistors are also commonly referred to as Neutral Earthing Resistors and Earth Fault Protection Resistors
Cast Iron Grid Type NGR
Request Callback
₹ 300000 / Unit Get Latest Price
| Resistance Value | Depends on Current |
| Usage/Application | Cement Industry, Steel Industry, Power plants, substations, Metro, Transformer, Generators |
| Mounting type | Through Hole |
| Shape | Rod Type |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V - 33kV |
| Brand | National Resistors |
| Thickness | 22 mm |
NGR Element Material:
Advantages of This Type Elements:
Resistor Element - Cast Iron
NGR Enclosure Material:
Thickness Available: 12 mm to 22 mm
- Cast Iron Grid is one of the Type of construction of Resistor Element. This Type of Resistor elements are used in generally in NGR which is having very Hight current rating i.e. 2000-3000A
Advantages of This Type Elements:
- Suitable for higher currents
- Resistor element is a continues without breakage
Resistor Element - Cast Iron
NGR Enclosure Material:
- Enclosure will be provided in MS (CRCA), Aluminium, Unpainted Stainless Steel (AISI-304/316), painted Stainless Steel (AISI-304/316), Hot Dip Galvanised, Normal Galvanising as per customer requirement and thickness of enclosure will be 1.5mm -3 mm as per customer requirement
Thickness Available: 12 mm to 22 mm
Neutral Grounding Resistor With Pulsating Circuit
Request Callback
₹ 200000 / Piece Get Latest Price
| Resistance Value | Depends on Current |
| Capacity | Custmized |
| Usage/Application | Electrical Industry |
| Mounting type | Through Hole |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V |
| Brand | National Resistors |
| Surface Treatment | Soft & annealed |
Minimum order quantity: 1 Piece
High-Resistance Grounding (HRG) Systems for Enhanced Safety & Service Continuity
We offer advanced High-Resistance Grounding (HRG) Systems, engineered to deliver maximum safety, fault detection, and uninterrupted power supply — ideal for critical operations where continuity of service is a top priority.
✅ Key Features & Advantages-
Improved System Safety: Limits fault current via a high resistance between system neutral and ground, reducing damage and enhancing personnel safety.
-
No Trip on First Fault: Allows operation to continue during the first ground fault — preventing unwanted shutdowns.
-
Real-Time Fault Monitoring: Integrated ground current sensing and relay-triggered alarms notify operators of abnormal conditions immediately.
-
Built-In Fault Tracing: Advanced pulser circuit and clamp-on ammeter compatibility help quickly locate fault origin without full shutdown.
-
Control Power Ready: Internal transformer supplies control power from the main source — no external supply required.
-
Adjustable Pulse Timing: Recycle timer allows tuning of fault location pulses for accurate and efficient diagnostics.
-
Data Centers
-
Refineries & Chemical Plants
-
Industrial Manufacturing Units
-
Hospitals & Continuous Process Plants
-
Power Distribution Networks
-
Export Ready: Engineered to meet international standards.
-
Custom Configurations: Voltage, resistance, and enclosure types tailored to your application.
-
Fast Support & Documentation: Datasheets, drawings, and commissioning support available.
�� Contact us today to discuss your HRG system needs or request a technical proposal.
�� Worldwide shipping | �� Quick response team | �� On-site support (on request)
Neutral Grounding Resistor With Monitoring Failsafe Relay
Request Callback
₹ 115000 / Unit Get Latest Price
| Resistance Value | Depends on current |
| Usage/Application | Mines, Oil Industry |
| Mounting type | Through Hole |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V to 33kV |
| Brand | National Resistors |
| Surface Treatment | Soft & annealed |
| Material | S.S -AISI-304, AISI-406, Ni-Cr |
In outdoor distribution station there are many possibilities of damage to the neutral grounding connections due to various environmental effects causing open circuit or burning of NGR. This is a very dangerous continuity i.e. totally floating type. This may also result in failure of earth-leakage protection operating through neutral CT as the leakage current may not be able to flow through open circuit of neutral grounding connection.To prevent this type of failure, Fail Safe Relays must be installed. The fail safe relay will continuously monitor the continuity of NGR and neutral grounding connections and will trip the feeder circuit breaker as and when any open circuit occurs in neutral grounding connection or in NGR. The fail safe relay will ensure fail safe operation of neutral grounding system.This Type of system is generally used in Mines & Oil IndustryFor Mines, as per DGMS Guidelines, for MV System (3.3kV, 6.6kV & 11kV) Fault current is restricted to 50A and for LT system (415V & 230V) fault current is resyricted to 0.750mA
Price Range: 90000 to 450000
Price Range: 90000 to 450000
NGR NIS Panel
Request Callback
₹ 300000 / Unit Get Latest Price
| Resistance Value | Depends on current |
| Usage/Application | Cement Industry, Steel Industry, Power plants, substations, Metro, Transformer, Generators |
| Mounting type | Through Hole |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Range | 415V -33kV |
| Brand | National Resistors |
| Material | AISI 304 / AISI 430 / AISI 410 / AISI 406 |
| Surface Treatment | Soft & annealed |
NGR & NIS Panel normally consist of two separate cubicles attached to each other. The Resistance cubicle consists of number of Resistance Banks (Tiers) mounted one on top other and supported on HT Insulators. The enclosure is fitted with covers, provided with louvers and wiremesh. A Space Heater is provided to prevent condensation of moisture.
A Single Pole Isolator is provided in the Neutral Circuit and the other end is connected to the NGR. The HT Bushings, to connect the NGR Terminals are mounted on the partition wall of the NGR & NIS Cubicles.LT Terminal Box for housing Thermostat and MCB, ON / OFF indicating lamps & LT terminals of Isolator & CTs etc. are provided in the NIS Cubicle.
A Single Pole Isolator is provided in the Neutral Circuit and the other end is connected to the NGR. The HT Bushings, to connect the NGR Terminals are mounted on the partition wall of the NGR & NIS Cubicles.LT Terminal Box for housing Thermostat and MCB, ON / OFF indicating lamps & LT terminals of Isolator & CTs etc. are provided in the NIS Cubicle.
NGTR Panel-Loading Resistor
Request Callback
₹ 150000 / Unit Get Latest Price
| Usage/Application | Generator Earthing |
| Mounting type | Through Hole |
| Material | AISI 304 |
| Brand | National Resistors |
| Max. Overload Voltage | 10% |
| Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
| Country of Origin | Made in India |
| Surface Treatment | Soft & annealed |
This Type of Eathing system is used when High Resistance grounding is required. This type of NGR is mostly used in Generator Earthing. Fault Current rating of such system is 5-10A.
This type of system is used where continuous operation is required though falut is occured.
In this system, a single phase distribution transformer is used in conjunction with a loading resistor, to provide high resistance grounding.
It allows the system to operate like an ungrounded system under normal operating conditions, while still retaining the ability to limit fault currents during a fault conditions.
The primary of the transformer is connected from the system neutral to ground. The loading resistor is connected across the transformer secondary.When a ground fault occurs downstream of the grounding transformer, ground fault current flows through the fault, back through ground to the grounding transformer.The loading resistor limits the current flow in the secondary winding, which in turn limits the flow of the ground fault current upto 5A to 10A back into the system through the primary of the grounding transformer as per customer requirement. Value of Loading Resistor in Secondary circuit is calculted on the basis of how much fault current is required & system voltage.
The transformer primary voltage rating should be the same as the system line-to-line voltage or line-to-Neutral voltage. The secondary voltage is normally 240 or 110 volts.
This type of system is used where continuous operation is required though falut is occured.
In this system, a single phase distribution transformer is used in conjunction with a loading resistor, to provide high resistance grounding.
It allows the system to operate like an ungrounded system under normal operating conditions, while still retaining the ability to limit fault currents during a fault conditions.
The primary of the transformer is connected from the system neutral to ground. The loading resistor is connected across the transformer secondary.When a ground fault occurs downstream of the grounding transformer, ground fault current flows through the fault, back through ground to the grounding transformer.The loading resistor limits the current flow in the secondary winding, which in turn limits the flow of the ground fault current upto 5A to 10A back into the system through the primary of the grounding transformer as per customer requirement. Value of Loading Resistor in Secondary circuit is calculted on the basis of how much fault current is required & system voltage.
The transformer primary voltage rating should be the same as the system line-to-line voltage or line-to-Neutral voltage. The secondary voltage is normally 240 or 110 volts.
X
Contact Us
Vishwanath Jetithor (Partner)
National Resistors
Ground Floor, Gat No. 1559, Shelarvasti, Dehu Alandi Road, Chikhali
Pune - 411010, Maharashtra, India
Send Email