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Found 203 Articles for Power Systems
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
12K+ Views
String EfficiencyThe suspension insulator is the one which consists of a number of porcelain discs connected in series by metal links in the form of a string.The voltage applied across the string of the suspension insulators is not uniformly distributed across the various discs, i.e. the disc nearest to the line conductor has much higher potential than the other discs. This unequal potential distribution is undesirable and it is usually expressed in terms of string efficiency. Therefore, the string efficiency of the suspension type insulator is defined as follows −“The ratio of voltage across the whole string to the product ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
8K+ Views
Transmission Line SupportsThe supporting structures used for overhead transmission line conductors, such as poles and towers, are called the transmission line supports.Generally, the transmission line supports supposed to possess the following properties −The line supports should have high mechanical strength so that it can withstand the weight of conductors and wind loads, etc.It should be light in weight without the loss of its mechanical strength.It should have longer life.It should be cheap in cost and economical to maintain.Accessibility of line conductors for maintenance is to be easy.There are various types of line supports available. The choice of supporting structure for ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
6K+ Views
What is Electric Supply System?The carrier of electrical power from power generating station to the consumer’s premises for its utilisation is called the electrical supply system.The whole electric supply system is segmented into three principle components, viz. −Power generating stationTransmission systemDistribution systemThe electric power is produced at the power generating station which are located quite away from the consumers. Then, the power is transmitted over large distances to load centres with the help of conductors called transmission lines. Finally, it is distributed to a large number of consumers through a distribution system.Types of Electric Supply SystemDepending upon the types of ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
6K+ Views
The element of the transmission line by which the line conductors are insulated from supports is known as line insulator. The insulators used in the transmission lines are of various types. Some of the important types of insulators are given as follows −Pin Type InsulatorSuspension Type InsulatorStain InsulatorShackle InsulatorPin Type InsulatorsThe pin type insulator is shown in the figure. The pin type insulator is fitted to the cross-arm on the pole. The pin type insulator has a groove on the upper end of the insulator for housing the line conductor. The line conductor passes through this groove and is bounded ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
16K+ Views
Corona Effect in Overhead Transmission LineThe phenomenon of violet glow, hissing sound and production of ozone gas in an overhead transmission line is known as corona.When a very high voltage is applied across two conductors of the overhead transmission line whose spacing is large as compared to their diameters. When this applied voltage exceeds a certain value (called critical disruptive voltage), then the conductors are surrounded by a faint violet glow that is known as corona effect.In practice, the corona effect is accompanied by a hissing sound, production of ozone, power loss and radio interference. The higher is the transmission ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
6K+ Views
What are Insulators?Insulators are the elements of transmission system which provide necessary insulation between line conductors and supports and hence, prevent any leakage current from the conductors to the earth.The line conductors in the overhead transmission lines should be supported on the poles or towers in such a way that the current from the conductors do not flow to the earth through the supports which means the line conductors must be properly insulated from the supports. This is achieved by using the insulators between the line support and conductors.The commonly used material for manufacturing the insulators of overhead transmission line ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
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The transmission voltage for which the cost of conductors, transformers, insulators, switchgears and other terminal apparatus is minimum is called the economical transmission voltage.As we know, if the transmission voltage is increased, the volume of conductor material required for the transmission lines is reduced. Hence, this decreases the expenditure on the conductor material. It is advisable to use the highest possible transmission voltage in order to reduce the expenditure on the conductor material to a minimum. Although, it may be remembered that as the transmission voltage is increased the cost of insulation, transformers, switchgears and other terminal equipment also increases. ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
310 Views
Underground Electric Transmission SystemThe system of electric power transmission uses underground cables for transmitting the electric power from the generating station to the consumers is known as underground electric transmission system.Underground cables have low visibility and are not affected by bad weather. However, the cost of these cables is comparatively high and their laying process is also time consuming.Types of Underground Transmission SystemBased on the type of supply (i.e. AC or DC) and the number of conductors used, the underground electric transmission system can be classified into the following types −Underground DC SystemTwo-Wire DC SystemTwo-Wire DC System with Mid-Point EarthedThree-Wire ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
19K+ Views
AC (Alternating Current) and DC (Direct Current) are the two different types of electric current that are used in the welding process. AC arc welding is commonly used for down-hand heavy plate welds, fast fills and with aluminium TIG welding with high frequency, while DC welding is better for welding thinner metals. Also, the equipment used for DC arc welding are also cheaper than AC arc welding machinery.The specifications of equipment used in practice for AC and DC arc welding are given as follows −Specifications of AC Arc Welding Machinery - AC transformer − Step down, oil cooled, 3-phase, 50 ... Read More
![Manish Kumar Saini](https://www.tutorialspoint.com/assets/profiles/334420/profile/60_45466-1624275142.png)
4K+ Views
Resistance WeldingResistance welding is the process of joining of metals by applying mechanical pressure and by passing high electric current for a length of time through the metal area which is to be joined.The process of resistance welding was discovered by Professor Elihu Thompson in 1885 in Philadelphia. It was an accidental discovery, while experimenting with a spark coil operated form a bank of batteries, he accidentally welded two steel rods of about 0.635 diameter.The principle of resistance welding is the production of heat in the weld joint by passing a heavy current through the parts and this being followed ... Read More