Feb
7

High Voltage Fuse

A fuse interrupts excessive current (blows) so that further damage by overheating or fire is prevented. Wiring regulations often define a maximum fuse current rating for particular circuits. Over current protection devices are essential in electrical systems to limit threats to human life and property damage. Fuses are selected to allow passage of normal current plus a marginal percentage and to allow excessive current only for short periods. Slow blow fuses are designed to allow higher currents for a modest amount of time longer, and such considerations are and were commonly necessary when electronics devices or systems had electronic tube tech or a large number of incandescent lights were being powered such as in a large hall, theater or stadium. Tubes and incandescent lights each have reduced current needs as they heat up to operating temperatures for their internal resistance grows as they are heated— the same physics principle causes the fuse material to melt, disconnecting the circuit from power.

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Dec
13

High Voltage Insulator

Introduction

The purpose of the insulator or insulation is to insulate the electrically charged part of any equipment or machine from another charged part or uncharged metal part. At lower utilization voltage the insulation also completely covers the live conductor and acts as a barrier and keeps the live conductors unreachable from human being or animals. In case of the high voltage overhead transmission and distribution the transmission towers or poles support the lines, and Insulators are used to insulate the live conductor from the transmission towers. The insulators used in transmission and distribution system are also required to carry large tensional or compressive load.
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Dec
13

About National Switchgears

Author admin    Category Switchgears     Tags

Founded in 1984, Ahmedabad Corporation National Switchgear was started with a primary focus of serving the electrical service shop industry with quality surplus Circuit Breakers, GOAB switch (operated air break switch), Drop Out Fuse and Operating Rod for Drop Out Fuse. Sharad Mehta, company co-founder and president, had a simple mission: operate with integrity and provide our customers with unparalleled responsive service and quality equipment.

Since conception, National Switchgear has moved from strength to strength, but we have never abandoned the focus of providing customers value through quality products and responsive service. Responding to customer needs, national switchgear created a new division focused on full-service electrical testing and onsite electrical maintenance services.

Today, National Switchgear deal’s in HT & L.T. Porcelain Insulators, Transmission line material and sub-station equipment, Overhead Line Material, Lightning Arrester, Fuse Elements, Galvanized Hardware, Stay set, Rubber Hand-Gloves, Rubber Sheet, A.C.S.R. Conductor and many more.

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Dec
12

What Is Switchgear and How Does It Work?

Switchgear refers to electrical equipment that regulates the flow of electricity within an electrical system. It is used by utility providers and private facilities alike for two reasons: to prevent overloads and short circuits, and to de-energize circuits for testing and maintenance. The most familiar types of switchgear are circuit breakers and fuses, which interrupt the flow of electricity to a circuit when its current becomes too high; and power transfer switches, which transfer a buildings source of electricity from a primary source to a secondary source, such as accessing generator power during a power outage.
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Dec
12

Composite insulators have

Composite insulators have

Early years of the insulator used for telegraph poles, with the development of technology, and slowly developed in the high-pressure wire to connect one end of the tower hung a lot of disk-shaped insulator, which is to increase the creepage distance, usually made ​​of glass or ceramic , called insulators. Insulator in the overhead transmission line plays two fundamental roles, namely, support wires and prevent current back to the ground, these two roles must be guaranteed, insulators should not be due to environmental conditions and electrical load changes caused by various electrical and mechanical stress and failure, otherwise the insulator does not have a significant effect, it will damage the whole line use and operational life.

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Nov
22

Shackle Insulators

Shackle Insulator

Shackle Insulator

 

The Shackle Insulator is made from high quality porcelain material since it is one of the best insulators. These are highly reliable for conductors. The Shackle Insulators are designed to meet electricity demands in the most cost effective manner.

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Nov
22

What is Post Insulators?

Post Insulators

Post Insulators

 

 

Post Insulators are made of epoxy resin with threaded inserts made of aluminum alloy. The casting methods we use guarantee products with excellent electrical and mechanical properties and constant quality.

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Nov
21

What Is A Transmission Line ?

Transmission Line is a conductor which is capable of transmitting energy from one point to another. Some examples of transmission lines include electric power lines, wiring, and coaxial cable. Depending on the project, there are a number of characteristics which a transmission line must have in order to function effectively. For large-scale products and systems, specialty products may need to be engineered and designed to meet the specific need.

Several types of energy can be transmitted over a transmission line. Electrical power is a familiar example for many people, but these lines can also carry acoustic energy and electromagnetic energy which may include light. Transmission Line can be designed to carry large quantities or small ones, and can operate in a variety of conditions including extreme temperatures and pressures, along with wet environments. The lines are usually rated to indicate what kind of energy they can transmit and in what volume, with people selecting transmission lines which are rated well above the intended use to increase safety.

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Nov
21

Cable Jointing Kit By National Switchgears.

Cable Jointing Kit Products

Cable Jointing Kit Products


Cable Jointing Materials
jointing materials otherwise called as Cable Assemblies are helpful in assembling of cables. Cable Jointing Materials supplied by National Switchgears are manufactured using quality raw materials by our vendors. National Switchgears believe in quality. In addition these Cable Jointing Kit are products are quality tested by our team of professionals to ensure their long lasting performance and better results. Our products are highly valued among our clients due to their functionality and long lasting time.

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Nov
21

What is Overhead power line & How It Came.

DP Structure

DP Structure

 

An Overhead power line is an electric power transmission line suspended by towers or utility poles. Since most of the insulation is provided by air, overhead power lines are generally the lowest-cost method of transmission for large quantities of electric energy. Towers for support of the lines are made of wood (as-grown or laminated), steel (either lattice structures or tubular poles), concrete, aluminum, and occasionally reinforced plastics. The bare wire conductors on the line are generally made of aluminum (either plain or reinforced with steel, or sometimes composite materials), though some copper wires are used in medium-voltage distribution and low-voltage connections to customer premises. A major goal of overhead power line design is to maintain adequate clearance between energized conductors and the ground so as to prevent dangerous contact with the line. Today overhead lines are routinely operated at voltages exceeding 765,000 volts between conductors, with even higher voltages possible in some cases.

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National Switchgears
403, Ashwamegh Avenue,
Near Mithakhali Six Road,
Navrangpura,
Ahmedabad - 380009
Gujarat - INDIA

Mobile: +91-9879539725
Tel / Fax +91-79-26461471

Email ID: info@national-switchgears.com
sharad.mehta61@gmail.com

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