Single line diagram of power system

The single line diagram of power system is very important for electrical engineering students, professionals and those are working in this sector.  The whole electrical power system is consists of four sections like generation, transmission, distribution and consumption.

A single line diagram is a diagram which shows us the overall power system with a single line.

Power generation: Where there electrical power is generated is called power station or power plant. There are 146 power generating stations in Bangladesh. Bangladesh has now a capacity of 25235 megawatt power generation. The major components of a power plants are generation and prime moover and step up transformer. In Bangladesh, electrical power is usually generated in 11kv and then it’s voltage level is stepped up by the step up transformer like 11kv/132kv or 11kv/230kv or 11kv/400kv as per economic considerations of transmission. All the power station supplies their generated power in a single transmission line called national grid. There are 193 grid sub-station in Bangladesh.

Single line diagram
photo: single line diagram of power system

Power then stepped down with voltage level 33kv or 66kv as per need. And then distribute through distribution network to different distributors. Large consumers get the supply of electricity from 33 kv or 11kv distribution line as per their demand. On the other hand, the voltage level again stepped down in 440 volt for the consumer who need three phase supply and 230 volt for small consumers who need single phase supply. The length of total distribution line is 6.12 lakh kilometers. The number of electricity consumer is 4 crore 1 lakh. At present 99.5% people of Bangladesh are enjoying the benefits of electricity.

To know more about the power sector of Bangladesh, please click on the link below.


Bangladesh government has set a target to generate 40000 Megawatt electricity by 2030 and 60000 Megawatt by 2060.

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