Since 2004, we have been manufacturing, exporting and supplying Neutral Grounding Resistor. Under the proper observation of our experts, the offered resistor is manufactured by utilizing fine grade components with the aid of modish techniques. This resistor is extensively used in industrial power system for the purpose of grounding generators and transformers and are made using steel cast iron, FeCrAl and nichrome. The temperature rise of these resistors is normally 375oC/760oC which can be changed asper the needs of customers. Neutral Grounding Resistors are applicable to AC distribution network for preventing any fault which would occur due to fault in earth wire. Furthermore, the offered NGR can be availed from us at reasonable rates. Basically, Neutral Grounding Resistor is a resistance that is linked between neutral points of earth and transformer.
Neutral Grounding Resistors Operational utilities and benefits:
Eliminates various problems such as transitory over, lower voltages, inverse flash, inadequate current flow and others.
Gives protection to transformers from damage and burning.
The ohmic value remains constant, even if the temperature rises.
Reduces the potential ground-fault current to a predetermined value.
Also named as Earth Fault Protection, this prevents fault damage.
Employed for earth fault protection in the many of the medium voltage electricity generation as well as distribution systems.
Offers the best choice in terms of quick response to figure out the setback.
Prevents and minimizes the overheating and mechanical stress on the conductors.
Permits to hold down the ground faulty current for a short period of time to promptly discover the fault, besides protecting the transformers.
Product Specifications:
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 are 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 customers requirement.
Construction: NGR include resistor assembly, plus required insulators, internal connections and hardware etc.
Different type of Enclosure facility available
Our provided can be install both in indoor or outdoor locations
Is available with both system voltage and operating voltage system
Duty rating 10 sec., 30 sec., 60 sec., & more..
Grounding resistor temperature can rise over ambient temperature
As per IS-12063 having material for enclosure
Cabling / Termination : Suitable arrangement and clearance is provided for termination of cable, flats or bus duct as per requirement with undrilled removable gland plate.
Important Definitions & Construction:
Rated Voltage : For NGR rated voltage means line- to neutral voltage i.e. System Voltage divided by root3 i.e. 1.732.
Rated Current : Means Initial current that will flow through resistor when it is cold. Normally Full load current value is same as Rated current.
Time Rating : It is length of time for which NGR must tolerate rated voltage.
Short Time Rating : Normally it is 10 sec. or 30 sec. or 60 sec. depending on design parameters of protection system. IS-3043 recommends 30 sec. rating.
Continuous Rating : It is normally 10 % of full load current for healthy system NGR to be designed for continuous rating of 5 % to 10 % of full load current (if required).
Tests:
(A) Routine Tests :
Visual and Dimensional
Resistance value measurement with 10 % tolerance
Insulation resistance value measurement by using 500V / 1000V megger before and after dielectric test
H.V. Test of twice the rated voltage +1000 volts for voltage class below 660 volts or 2.25 times of rated voltage +2000 volts for voltages above 1100 volts.
(B) Type Tests :
Temperature rise test i.e., Heat run test if required will be conducted by passing equivalent / rated current for rated / equivalent time keeping IT Constant through a part of Resistor.
Features Provided:
Our range of NGR For Transformers does not need continuous monitoring or maintenance and is directly connected to the MV & LV supply network in order to render shield to transformers from harmful current. Offered Neutral Grounding Resistor comes with better features between the neutral point of the transformer and the ground, which Some features are below:
Engineered with a stainless steel wire grid or punched sheet, this Neutral Grounding Resistor ensures high fault current limitation and resistance to corrosion. Its weatherproof enclosure and powder-coated finish make it suitable for both indoor and outdoor settings, sustaining efficiency in harsh environments.
Customizable for Every System
With resistance values tailored to your specific setup (150 Ohms), adjustable dimensions, and multiple mounting optionsincluding floor and skid mountthis NGR integrates seamlessly into a wide range of industrial applications. Heavy-duty lugs and bolted terminals guarantee secure, adaptable connections.
Compliance and Efficiency Assured
Manufactured in accordance with IEC 60609 and IS 3043 standards, the NGR delivers certified safety and performance. It achieves high operational efficiency (98%), with a unity power factor, low energy consumption, and optional thermal sensors for enhanced overheating protection.
FAQs of Neutral Grounding Resistor:
Q: How does the Neutral Grounding Resistor (NGR) improve electrical system safety?
A: The NGR limits high fault current during ground faults in transformers and generators, thereby protecting equipment from damage and reducing electrical hazards in industrial environments.
Q: What are the main usage applications for this Neutral Grounding Resistor?
A: This NGR is primarily used for neutral earthing of transformers and generators in power plants, substations, and other electrical installations requiring reliable fault current limitation.
Q: When should a customized resistance value be selected for an NGR?
A: A custom resistance value (between 150 Ohms) should be chosen based on the specific systems voltage, desired fault current limitation, and engineering guidelines to ensure optimal protection and compliance.
Q: Where can this NGR be installed?
A: Designed with a weatherproof enclosure and IP23 or higher rating, this NGR is suitable for both indoor and outdoor installations in a variety of site conditions, including altitudes up to 1000 meters.
Q: What is the manufacturing process and material used for this NGR?
A: It is constructed from high-quality stainless steel or alloy in a wire grid or punched sheet configuration, finished with a corrosion-resistant powder coating and insulated with ceramic or porcelain materials for safety.
Q: How is overheating protection implemented in this NGR?
A: An optional thermal sensor can be integrated to monitor temperature and provide timely alerts or system shutdown in case of overheating, ensuring continued safe operation.
Q: What are the benefits of choosing this NGR for industrial projects?
A: Key advantages include customizable resistance, low maintenance, rugged construction, high efficiency (98%), reliable performance under high fault conditions, and compliance with international standards, making it suitable for demanding environments.
Tell us about your requirement
Price:
Quantity
Select Unit
50
100
200
250
500
1000+
Additional detail
Mobile number
Email
Name
Comapny Name
Phone Number
Email Id
City / State
Confirm Your Requirement
Verification Code
Did not receive yet?
Resend OTP
Youre Done!
We have received your requirements and will reply shortly with the best price.
Products You May Like
Other Products in 'Neutral Grounding Resistor' category
"We mainly deals in export markets as Nepal, Kenya, Yemen, Saudi Arabia, Dubai, Riyadh, Sudan, Iraq, Singapore, Vientiane, Bangkok, Manila, Nigeria, Africa, Malaysia, Syria, Amman, Jordan, Iraq, Thailand, Zambia, Rwanda At East Africa, Lusaka, Zambia, Jakarta, West Africa & Ethiopia."
Send Inquiry
Send Inquiry
Send SMS
Call Me Free
English
Spanish
French
German
Italian
Chinese (Simplified)
Japanese
Korean
Arabic
Portuguese