In this article we will know about the classification of distribution system. we will also discuss about the primary and secondary distribution system. we will know ac and dc distribution system and radial and ring main system.
Classification of Distribution System
Distribution system Classification
The conductor system, by means of which electrical energy is conveyed from bulk power source or source to the consumers, is known as distribution system. The distribution system may be divided into two systems known as high voltage (primary) distribution and low voltage (secondary) distribution.
From generation stations the electrical energy is actually transmitted to various substations through extra high tension transmission lines at voltage from 33 to 220 kV. At these substations this voltage is stepped down to 11 or 6.6 or 3.3 kV and power at this voltage is conveyed to different substation for distribution and to the bilk supply consumers.
At distribution substation, the voltage is stepped down to 400 volts. From these substation various low voltage (400 volts between phase and 230 volts between phase and neural) distributors radiate out and feed the consumers. it is main classification of distribution system.
Distribution system may be classified in various ways
According to current the distribution systems may be classified as
it is also main classification of distribution system.
According to the character of service the distribution system may be classified as
- General light and Power
- Industrial power
- Street lighting etc.
These are also classification of distribution system.
According to type of construction, the distribution system may be classified as
- Overhead distribution system
- Underground distribution system
According to number of wires the distribution system may be classified as
- Two wire System
- Three wire System
- Four wire Distribution system
In case of d.c. supply 3 wire distribution system is usually employed owing to its advantages over two wire distribution system. In case of ac supply 3 phase 3 wire is employed for balanced loads such as power use phase 4 wire system is employed for unbalanced loads such as light and power loads combined. Single phase two wire system is used for lighting and small appliances.
According to scheme of connections, the distribution systems an classified as
- Radial system
- Ring system
- Interconnected System
1.Radial System .
In this System of distribution, the distributors are fed at one end only.
2.Ring Main System
In this system, each consumer is supplied via two feeders. The arrangement is similar to two feeders in parallel on different routes.
3. Interconnected System
When two or more generating stations are connected together. The system is known as interconnected system. Reliability of the system increased in this case. it is most useful classification of distribution system.
A bundle conductor is a conductor made up of two or more sub-conductors and is used as one phase conductor. It is found that the increase in transmission capacity justifies economically the use of two conductor bundles on 220 KV lines. The following are the advantages in using bundled conductors.
- Reduce Reactance
- Reduced voltage gradient
- Reduced corona loss
- Reduced radio interference
- Reduce surge impedance
Hence these are classification of distribution system. if you will find any incorrect in above article you must comment below in comment box.