CLASS NOTES ON ELECTRICAL POWER TRANSMISSION AND DISTRIBUTION
F OREWORD BY THE AUTHOR
The invention of the electric lamp by Edison in the late 1870s led to rapid expansion in the
use of electric power. To facilitate the electric power has to be generated and transmitted to the
consumers via a transmission and distribution network. In 1882 the first electric power station
Pearl street Electric station in New York city went into operation.
The original electrical distribution system developed by Thomas Edison was an
underground direct current (DC) system. This was followed by first ac transmission line by
Westinghouse in 1886. Ferranti constructed a 10kV link from Deptford, Kent to New Bond Street
in London. From the turn of the century to the late 1920s there had been a gradual increase in
machine voltage up to 11kV. In 1928, the first 33kV machine was commissioned. Since then there
have gradual change in technology, which has enabled the system to operate at extra high voltage
220kV, 400kVand ultra high voltage of 750kV, 1500kV.
Thus the study of transmission and distribution has become very fundamental for electrical
engineering students. After studying this subject, the student shall be able to address and
understand the issues related to the transmission and distribution.