Our product range includes a wide range of neutral grounding resistor with vc panel, neutral earthing resistor, punched grid type ngr, punched patti grid type ngr, 22 kv neutral grounding resistor and formed stainless steel (fss grid) type neutral grounding resistor.
₹ 3.50 Lakh /Unit Get Latest Price
Usage/Application | Generators |
Brand | National Resistors |
Mounting type | Through Hole |
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
Range | 415V - 33kV |
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.
₹ 2.50 Lakh /Unit Get Latest Price
Usage/Application | Electrical Industry |
Mounting type | Through Hole |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
Frequency | 50 Hz |
Range | 415V -33kV |
Brand | National Resistors |
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:
₹ 1.50 Lakh /Unit Get Latest Price
Usage/Application | Mines, Steel Industry, Power plants, substations, Transformer, Generators |
Brand | National Resistors |
Mounting type | Through Hole |
Shape | Sheet |
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
NGR Element Material:
₹ 2 Lakh /Unit Get Latest Price
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 |
NGR Element Material:
₹ 2.50 Lakh /Unit Get Latest Price
Usage/Application | Mines, Steel Industry, Power plants, substations, Transformer, Generators |
Brand | National Resistors |
Mounting type | Through Hole |
Shape | Rod, Sheet |
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
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
₹ 1.25 Lakh /Unit Get Latest Price
Usage/Application | Cement Industry, Steel Industry, Power plants, substations, Metro, Transformer, Generators |
Mounting type | Through Hole |
Brand | National Resistors |
Shape | Rod Type |
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
NGR Element Material:
₹ 3.50 Lakh /Unit Get Latest Price
Usage/Application | Mines, Steel Industry, Power plants, substations, Transformer, Generators |
Material | AISI 304 / AISI 410 / AISI 430 |
Brand | National Resistors |
Mounting type | Through Hole |
Shape | Rod, Sheet, Wire |
Max. Overload Voltage | 10% |
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
₹ 3 Lakh /Unit Get Latest Price
Usage/Application | Cement Industry, Steel Industry, Power plants, substations, Metro, Transformer, Generators |
Brand | National Resistors |
Mounting type | Through Hole |
Shape | Rod Type |
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
NGR Element Material:
₹ 2 Lakh /Piece Get Latest Price
Usage/Application | Oil Industry |
Brand | National Resistors |
Mounting type | Through Hole |
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
Range | 415V |
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.
₹ 1.15 Lakh /Unit Get Latest Price
Usage/Application | Mines, Oil Industry |
Brand | National Resistors |
Mounting type | Through Hole |
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
Range | 415V to 33kV |
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
₹ 1.50 Lakh /Unit Get Latest Price
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
Material | AISI 304 |
Usage/Application | Generator Earthing |
Brand | National Resistors |
Mounting type | Through Hole |
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.
₹ 3 Lakh /Unit Get Latest Price
Usage/Application | Cement Industry, Steel Industry, Power plants, substations, Metro, Transformer, Generators |
Brand | National Resistors |
Mounting type | Through Hole |
Max. Overload Voltage | 10% |
Warranty | 12 months from commissioning or 18 Months from supply whichever is earlier |
Range | 415V -33kV |
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.
₹ 95,000 /Unit Get Latest Price
Usage/Application | Neutral Grounding of Transformer/Generator |
Material | AISI 304 / AISI 410 / AISI 406 |
Mounting type | Through Hole |
Brand | None |
Shape | Rod Type |
Max. Overload Voltage | 10% |
NGR Element Material:
Vishwanath Jetithor (Partner)
National Resistors
Ground Floor Gat No. 1559 Dehu Alandi Road Shelarvasti Chikhali
Pune - 411010, Maharashtra, India