Supply Systems in Power System

Requirements of Satisfactory Electric Supply Connection: The Electric Supply Connection in India is 3-phase a.c. operating at a frequency of 50 Hz. The power station delivers power to consumers through its transmission and distribution systems. The power delivered must be characterized by constant or nearly constant voltage, dependability of service, balanced voltage, efficiency so as […]

Economic Choice of Transmission Voltages: It has been shown earlier here that if transmission voltage is increased, the volume of con­ductor material required is reduced. This decreases the expenditure on the conductor material. It may appear advisable to use the highest possible transmission voltage in order to reduce the expenditure on conductors to a minimum.

Economic Choice of Conductor Size: The cost of conductor material is generally a very considerable part of the total cost of a transmission line. Therefore, the determination of proper Conductor Size for the line is of vital importance. The most economical area of conductor is that for which the total annual cost of transmission line

Comparison of Various Systems of Transmission: Below is given the table which shows the ratio of conductor-material in any Comparison of Various Systems of Transmission with that in the corresponding 2-wire d.c. system. Cos Φ is the power factor in an a.c. system. The following points may be noted from the above table : There

Comparison of Conductor Material in Underground System: In an Conductor Material in Underground System using multi-core belted type cables, the chief stress on the insulation is usually between conductors. Under such situations, comparison is made on the basis of maximum voltage between conductors. Again assumptions made are The same power (P watts) is transmitted by

Comparison of Conductor Material in Overhead System: In comparing the relative amounts of Conductor Material in Overhead System necessary for different systems of transmis­sion, similar conditions will be assumed in each case viz., same power (P watts) transmitted by each system. the distance (1 metres) over which power is transmitted remains the same. the line

Various Systems of Power Transmission: It has already been pointed out that for transmission of electric power, 3-phase, 3-wire a.c. system is universally adopted. However, other systems can also be used for transmission under special circumstances. The Various Systems of Power Transmission are 1.D.C. system D.C. two-wire. Two-wire with mid-point earthed. Three-wire. 2.Single-phase A.C. system

Advantages of High Transmission Voltage: The Advantages of High Transmission Voltage at high voltages due to the following reasons : (i) Reduces volume of conductor material: Consider the transmission of electric power by a three-phase line. Let P = power transmitted in watts V = line voltage in volts cos Φ = power factor of

Comparison of AC Transmission and DC Transmission: The electric power can be transmitted either by means of d.c. or a.c. Each system has its own merits and demerits. It is, therefore, desirable to discuss the technical Comparison of AC Transmission and DC Transmission of electric power. DC Transmission: For some years past, the transmission of

Electric Supply System: The conveyance of electric power from a power station to consumers’ premises is known as Electric Supply System. An electric supply system consists of three principal components viz., the power station, the transmission lines and the distribution system. Electric power is produced at the power stations which are located at favorable places,