Distribution Systems

Distribution Systems:

AC Distribution System : Now-a-days electrical energy is generated, transmitted and distributed in the form of alternating current. One important reason for the widespread use of alternating current in preference to direct current is the fact that alternating voltage can be conveniently changed in magnitude by means of a transformer. Transformer has made it possible to transmit a.c. power at high voltage and utilise it at a safe potential. High transmission and …


DC Distribution System : It is a common knowledge that electric power is almost exclusively generated, transmitted and dis­tributed as a.c. However, for certain applications, d.c. supply is absolutely necessary. For instance, d.c. supply is required for the operation of variable speed machinery (i.e., d.c. motors), for electro­chemical work and for congested areas where storage battery reserves are necessary. For this pur­pose, a.c. power is converted into d.c. power at the substation …


Distribution System Connection : All Distribution System Connection of electrical energy is done by constant voltage system. In practice, the following distribution circuits are generally used 1.Radial System: In this system, separate feeders radiate from a single substation and feed the distributors at one end only. Fig. 12.8 (i) shows a single line diagram of a radial system for d.c. distribution where a feeder OC supplies a distributor AB at point A. Obviously, …


Electric Power Distribution System : Electric Power Distribution System states that part of power system which distributes elec­tric power for local use is known as distribution system. The electrical energy produced at the generating station is conveyed to the consumers through a network of transmission and distribution systems. It is often difficult to draw a line between the transmission and distribution systems of a large power system. It is impossible to distinguish the …


Overhead vs Underground System : The distribution system can be Overhead vs Underground System. Overhead lines are generally mounted on wooden, concrete or steel poles which are arranged to carry distribution transformers in addition to the conductors. The underground system uses conduits, cables and manholes under the surface of streets and sidewalks. The choice between Overhead vs Underground System system depends upon a number of widely differing factors. Therefore, it is desirable …


Requirements of a Distribution System : A considerable amount of effort is necessary to maintain an electric power supply within the requirements of various types of consumers. Some of the good Requirements of a Distribution System are : Proper voltage Availability of power on demand Reliability 1.Proper voltage: One important Requirements of a Distribution System is that voltage variations at consumer’s terminals should be as low as possible. The changes in voltage are generally caused due …