NGR / NER is used to ground the neutral of Transformer / Generator to limit prospective ground fault current to a predetermined safe value. The NGR avoids transient over voltage and gives system stability under fault conditions.
Load Bank is used to test and evaluate performance of Generators and UPS periodically, under various load conditions like full load/Inductive load/ sudden loads and Overload. Sometimes, it is used as Dummy Load for the generator to avoid Glazing of Pistons while running on very low load conditions.
Ever increasing usage of solid state devices like VFD drives and Thyristor controlled Electrical Furnaces etc causes distortion of waveforms with higher frequency Harmonics in supply system resulting in poor quality of power to end users. Harmonic filters are designed to bypass unwanted frequencies using combination of Reactor, Capacitors along with Resistor to achieve better quality power. We specialize in manufacturing medium voltage Filter Resistors for various applications starting from 11 kV onwards.
Traction Resistors are used for field control in DC motors / Dynamic Braking for deceleration of engine / Armature control or as Snubbers. The Resistors are rugged and should withstand severe vibration and shock.
They are used in distribution net works for easy Isolation, RMU, Neutral Grounding of multiple Generators etc., They will come with or without Earth switch.
The applications are innumerable like starting of slip ring Induction motor / Voltage dropping Resistor / Dynamic Braking Resistor for DC Motors / Traction Duty Resistors for Railways etc.,
World Class infrastructure set-up enables NATIONAL SWITCHGEARS to meet the production requirements with compliance to quality standards & time frame. The set-up has integrated facilities for design development, product assembly, quality assessments, storage and shipment. The facility is equipped to manufacture bulk products even in a short turnaround time.
The entire facility is supported by experienced workforce, capable of conceptualizing & understanding clients requirement and developing custom-made products that meet specifications and needs. All pre and post manufacturing operations are conducted in-house.
NATIONAL SWITCHGEARS is located in one of the premier developed industrial area, at Sidco Industrial Estate, Ambathur, Chennai - 600098 INDIA, with 20,000 sq. ft of production area & 4000 sq. ft of office area.
In house fabrication that meets IEC & BIS specification with all latest manufacturing equipment, surface treatment. Well equipped test facility with dedicated testing team, where the quality check takes place from initial stage of procuring raw materials to the product realization till the commissioning of the product at site.
Latest design software, exclusive CAD centre for elite 5 members team of design engineers and expert verification team.
National Switchgears is synonymous with Resistors. It was established in the year 1978 and is in business of designing and manufacturing resistor for various energy control applications since then. It is a professionally managed, highly focused and an ISO company.
We are also manufacturing Switch disconnectors for both indoor and outdoor applications up to 36KV. National Switchgears stands for quality ,Engineering design, reliability and service.
Leading companies, Multinational Engineering organizations and Consultants in India are our regular customers. We have been exporting our products to well over 38 countries which include Australia, Japan, UK, South East, African and Gulf countries. The products have been tested at CPRI (India), KEMA, Netherlands for International Standards. Most of the equipments are manufactured in accordance with relevant IEC, BS and NEMA Standards.
National Switchgears was founded with very purpose of manufacturing high quality resistor for various industrial and research applications in India. Over the years many types of resistors for Traction, Neutral, Grounding, Static VAR compensation, Binary Control, Starter, Load banks and Speed controllers have been supplied to leading firms in India and Abroad. Our innovative design conforming to International specifications and quality have made us as one of the pioneering manufacturers of NGR in India. We are the first company to export NGR from India. Almost all leading consultants in India and well known consulting firms in abroad have approved our NGR.
East Timor – Leste
Kingdom of Saudi Arabia
Kingdom of Bahrain
Sultanate of Oman
Trinidad and Tobago
United Arab Emirates