Underground DC SystemWhen the DC electric power is transmitted from the power generating station to the consumer through the underground cables, then the electric power transmission system is called the underground DC system.The underground DC transmission system is classified into three types −Two-Wire DC SystemTwo-Wire DC System with Mid-Point EarthedThree-Wire ... Read More

Suspension InsulatorThe suspension type insulator is the one which consists of a number of porcelain discs connected in series by metal links in the form of a string as shown in Figure-1.Potential Distribution over Suspension Insulator StringAs we know the string of suspension insulators consists of a number of porcelain ... Read More

Three-Phase Transmission SystemA three-phase transmission system is the one in which three line conductors are used to transmit the AC electric power from generating station to the substations. The three-phase system is universally adopted for transmission of electric power.Depending upon the number of conductors used, the three-phase AC transmission system ... Read More

Single-Phase AC Transmission SystemThe electric power transmission system in which two conductors viz. phase conductor and neutral wire are used to transmit the electric power is known as single phase AC transmission system.The single phase AC transmission system can be classified into following three types viz. −Single-phase two-wire system with ... Read More

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 ... Read More

The choice of operating frequency for electric heating is a significant factor for heating because it greatly affects the work to be heated and the method of its heating, whether dielectric heating or induction heating.In practice, the furnaces operating on power frequency of 50 Hz can be of 1 MW ... Read More

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 ... Read More

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 ... Read More

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 ... Read More

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 ... Read More