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Neutral Grounding Resistor

Neutral Grounding Resistor

Our product range includes a wide range of punched patti stainless steel grid type ngr, punched stainless steel grid type ngr, wire wound type neutral grounding resistor, ngr & nis panel, ngr with vc panel and cast iron grid type ngr.

Punched Patti Stainless Steel Grid Type NGR

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Product Price: Rs 2,00,000 / PieceGet Best Price

Product Details:

Resistance	53 ohm
Usage/Application	Electrical Industry
Mounting type	Through Hole
Brand	National Resistors
Temperature Coefficient	500 PPM
Resistance Tolerance	5%
Rated Power	24 kW
Operating Temperature	20 ~ +40 Degree

NGR Element 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,1. Suitable for Higher currents & Large time rating2. Cooling is achieved better in this type of construction.
Resistor Element - AISI-304, AISI -430, Fe-Cr-Al (AISI-406)
NGR Enclsoure 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

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Punched Stainless Steel Grid Type NGR

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Product Price: Rs 1,50,000 / UnitGet Best Price

Product Details:

Temperature Coefficient	500 PPM
Resistance	50 ohm
Resistance Tolerance	5%
Rated Power	20 kW
Operating Temperature	20 ~ +40
Standard	IEEE32

NGR Element Material -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,1. Better cooling due to larg surface area2. Element to Elment Bolted Connections3. Easy Replacement of Elements4. Suitable for continuous rating applications
Resistor Element - Material used for this type of construction are AISI-304, AISI-430
NGR Enclsoure 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.

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Wire Wound Type Neutral Grounding Resistor

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Product Price: Rs 1,00,000 / UnitGet Best Price

Product Details:

Temperature Coefficient	500 PPM
System Voltage	1.732
Temperature	375 deg.c
Full load current	5% and 10%
Material	Stainless Steel
Resistance	51 ohm
Resistance Tolerance	5%
Rated Power	21 kW
Operating Temperature	20 ~ +40 Degree

NGR Element Material -Wire wound 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 small current rating i.e. upto 5A
Advantages of This Type Elements,1. Suitable for smaller currents2. Constant Resistance
Resistor Element - Ni-Cr (80-20%), AISI-304, Fe-Cr-Al (AISI-406), Cu-Ni
NGR Enclsoure 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

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NGR & NIS Panel

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Product Price: Rs 3,00,000 / PieceGet Best Price

Minimum Order Quantity: 1 Piece

Product Details:

Resistance	52 ohm
Usage/Application	Neutral Ground
Mounting type	Through Hole
Brand	National Resistors
Temperature Coefficient	500 PPM
Resistance Tolerance	5%
Rated Power	22 kW
Operating Temperature	20 ~ +40 Degree C

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.

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NGR with VC Panel

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Product Price: Rs 3,50,000 / PieceGet Best Price

Product Details:

Resistance	55 ohm
Usage/Application	Electrical Industry
Mounting type	Through Hole
Brand	National Resistors
IP Protection	IP 33
Temperature Coefficient	500 PPM
Resistance Tolerance	5%
Rated Power	26 kW
Operating Temperature	20 ~ +40 Degree C

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.

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Cast Iron Grid Type NGR

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Product Price: Rs 3,00,000 / UnitGet Best Price

Product Details:

Temperature Coefficient	500 PPM
Temperature coefficient of resistance	0.05% per oC
Type	Resistor
Usage	Electrical industry
Material	Cast Iron
Resistance	50 ohm
Resistance Tolerance	5%
Rated Power	20 kW
Operating Temperature	20 ~ +40

NGR Element Material -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,1. Suitable for higher currents2. Resistor element is a continues without breakage
Resistor Element - Cast Iron
NGR Enclsoure 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

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22kV Neutral Grounding Resistors

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Product Price: Rs 2,50,000 / PieceGet Best Price

Product Details:

Mounting type	Through Hole
Brand	National Resistors
Ambient Temperature	Up to 50 C (For higher ambient temperature, consult factory)
Operation Voltage	22 kV line to line system
Rated Current	Up to 5000 A
Resistance Alloy	Stainless Steel
Protection Degree	IP 33

Operation Voltage : 22 kV line to line system
Rated Current : Up to 5000 A
Ambient Temperature : Up to 50 C (For higher ambient temperature, consult factory)
Resistance Alloy : Stainless-steel (AISI-304) , AISI -430 FeCrAl , Cu-Ni , Ni-Cr , Cast Iron
Protection Degree : IP 33 (outdoor) and others on demand
Standards : IEEE 32, IEC 60529

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Neutral Earthing Resistor

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Product Price: Rs 2,50,000 / PieceGet Best Price

Product Brochure

Product Details:

IP Protection	IP 33
Temperature Coefficient	500 PPM
Brand	National Resistors
Material	Cast Iron
Dimensions	1200L x 1200W x 1900H(mm)
Resistance	60 ohm
Rated Power	31 kW

We are engaged in the manufacturing and supplying of Neutral Earthing Resistors.

Three parameters are needed to specify the Earthing Resistor:

U rated voltage line to line voltage or system voltage (kV)
Rated fault current (a)
Rated time (sec) - duration of the fault
Resistance value: r =u 1/3

Calculation of hot resistance value:

The resistance of resistor element changes to an extent with temperature after rated time. The change may be calculated from the temperature coefficient of resistivity
R2 = R (1 + R)
R1 = Hot resistance value (q)
R1 = Resistance value at ambient temperature (£2)
D: = temperature coefficient of resistance material
As per ieee-32 for Neutral Earthing Resistor made from Stainless Steel Resistance material, the allowable temperature rise for 1030 or 60 sec time rating is 7600k,6io"k for extended time rating and 385ck for continuous rating

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NGR with Monitoring (Failsafe) Relay for Mines

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Product Price: Rs 2,50,000 / PieceGet Best Price

Minimum Order Quantity: 1 Piece

Product Details:

Usage/Application	Electrical Industry
Mounting type	Through Hole
Brand	National Resistors
Temperature Coefficient	500 PPM
Resistance	50 ohm
Resistance Tolerance	5%
Rated Power	20 kW
Operating Temperature	20 ~ +40

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.

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33KV Neutral Grounding Resistor

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Product Price: Rs 3,50,000 / PieceGet Best Price

Product Details:

Usage/Application	Neutral Grounding of Transformer/Generator
Mounting type	Through Hole
Temperature Coefficient	500 PPM
Resistance	54 ohm
Resistance Tolerance	5%
Rated Power	33 kV
Operating Temperature	20 ~ +40 Degree C

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.Technical Specifications• Operation Voltage : 33 kV line to line system• Rated Current : Up to 2000 A• Ambient Temperature : Up to 50 C (For higher ambient temperature, consult factory)• Resistance Alloy : Stainless-steel (AISI-304) , AISI -430 FeCrAl , Cu-Ni , Ni-Cr , Cast Iron• Protection Degree : IP 33 (outdoor) and others on demand• Standards : IEEE 32, IEC 60529

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Wire Grid Type NGR

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Product Price: Rs 80,000 / PieceGet Best Price

Product Details:

Country of Origin	Made in India
Full load current	10%
Material	Stainless Steel
Type	Resistor
Temperature	375 degree celsius
Temperature Coefficient	500 PPM
Resistance	56 ohm
Resistance Tolerance	5%
Rated Power	27 kW
Operating Temperature	20 ~ +40 Degree C

We provide an exclusive range of Wire Grid Type NGR.

Features :

Continuous Rating: It is normally 10 % of full load current for healthy system neutral grounding resistor to be designed for continuous rating of 5 % to 10 % of full load current (if required)
The material of Resistance Element: We offer resistor elements made from any stainless steel or FeCrAl or Cu-Ni or Ni-Cr or any other resistance material as per requirement. Normally formed stainless steel element is best and economical for NGRS
Temperature Rise Allowed: Normally Temperature rise is restricted to 375 deg.c. above ambient temperature as per BS-587. It can be 760 deg.c. as per IEEE-32. It can be offered of any other temperature rise as per customer's requirement
Construction: NGR includes resistor assembly, plus required insulators, internal connections and hardware etc
Cabling / Termination: Suitable arrangement and clearance are provided for termination of cable, flats or bus duct as per requirement with undrilled removable gland plate

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Formed Stainless Steel Grid Type NGR

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Product Price: Rs 1,20,000 / UnitGet Best Price

Product Details:

Application	Electrical indusrtry
IP Protection	IP 33
Shape	Cuboidal
Temperature Coefficient	500 PPM
Thickness	0.4-1.0 mm
Zinc coating	60-140g/sq.m
Temperature coefficient of resistance	0.15% / c and 0.094%/ c
Resistance	58 ohm
Resistance Tolerance	5%
Rated Power	29 kW
Operating Temperature	20 ~ +40 Degree C

NGR Element Material -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 Indusrty Industry and High current application
Advantages of This Type Elements,1. High Mechnanical stength 2. Good ability to absorb mechnical vibrations3. Resistor element to element welded connections4. econiomical construction
Resistor Element - Material used for this type of construction are AISI-304, AISI-410 & AISI -406
NGR Enclsoure 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

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NGR with Pulsating circuit

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Product Price: Rs 2,00,000 / PieceGet Best Price

Product Details:

Resistance	50 ohm
Usage/Application	Electrical Industry
Mounting type	Through Hole
Brand	National Resistors
IP Protection	IP 33
Temperature Coefficient	500 PPM
Resistance Tolerance	5%
Rated Power	26 kW
Operating Temperature	20 ~ +40 Degree

Where continuity of service is a high priority, high-resistance grounding can add the safety of a grounded system while minimizing the risk of service interruptions due to grounds. The concept is a simple one: provide a path for ground current via a resistance that limits the current magnitude, and monitor to determine when an abnormal condition exists. This provides for maximum continuity of service, because no tripping occurs for the resistance limited ground fault.The ground current path is provided at the point where the service begins, by placing resistance in the connection from system neutral to ground. Control equipment continuously measures ground current; a relay detects when the current exceeds a predetermined level. An alarm alerts building personnel that a ground exists. The system has built-in fault tracing means to assist in finding the source of the ground. An integral transformer provides control power from the primary source.The pulser circuit offers a convenient means to locate the faulted feeder and trace the fault to its origin. The pulser is available any time a fault has been detected. The pulse intervals are controlled by an adjustable recycle timer. The “pulse” light flashes on and off, corresponding to the on-off cyclesof the pulser contactor. The pulser contactor switches a bank of resistors on and off, thus allowing a momentary increase in the ground current (approximately a 5 A current pulse above the ground current).The current pulses can be noted with a clamp-on ammeter when the ammeter is placed around the cables or conduit feeding the fault. The operator tests each conduit or set of cables until thepulsing current is noted. By moving the ammeter along the conduit, or checking the conduit periodically along its length, the fault can be traced to its origin. The fault may be located at the point where the pulsing current drops off or stops.

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Product Price: Get Latest Price

Product Details:

Resistance	10 Ohm
Power Rating	1/2W
Usage/Application	Industrial
Country of Origin	Made in India
Brand	National Resistors

n Industrial Cement Resistor is a type of power resistor that is widely used in high-power applications for current limiting, voltage division, and surge suppression

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EXPLORE MORE CATEGORIES

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Neutral Grounding Resistor

Punched Patti Stainless Steel Grid Type NGR

Punched Stainless Steel Grid Type NGR

Wire Wound Type Neutral Grounding Resistor

NGR & NIS Panel

NGR with VC Panel

Cast Iron Grid Type NGR

22kV Neutral Grounding Resistors

Neutral Earthing Resistor

NGR with Monitoring (Failsafe) Relay for Mines

33KV Neutral Grounding Resistor

Wire Grid Type NGR

Formed Stainless Steel Grid Type NGR

NGR with Pulsating circuit

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