Power System Structure

For the economic development of any country power is the basic need. The availability of electricity has been the most powerful tools to drive the economic and social change through the world. Improvement in the standard of living of the people, increase in the productivity in industry, agriculture basically depends upon the adequate supply of the electricity. Mainly generation, transmission and distribution of the electrical energy have been the major component in national planning process.

Mainly generating stations and distribution systems are connected through the transmission lines, connects power of one system to another. Whereas, distribution system connects all the loads in particular area to the transmission line. The transmission system of an area is called grid. The various grid are interconnected through tie lines to form a regional grid and the different regional grid are interconnected to form national grid. Power is transmitted from one grid to another through lines with certain loss of generation.

In Nepal, NEA has  Hydroelectric Plants connected to the grid of capacity 480 Megawatts. It also buys power from Independent Power Producers (IPP) of capacity 230 Megawatts. It operates two fuel operated plants generating 53 Megawatts of Electricity. The total capacity of the Integrated Nepal Power System (INPS) which NEA operates stands at 757 Megawatts. The voltage used for the distribution are 11,6.6 and 3.3kv for primary distribution and 230 volts at secondary distribution.

The electrical energy is normally generated at the power stations which are far from the consumers. So the large bulk of the power is to be transmitted from the generating station to the consumer which is more economical and involves the different techniques of transmission and different equipment’s.

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