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Chapter: Transmission and Distribution : Structure of Power System

Classification of Distribution Systems

A distribution system may be classified according to ;

CLASSIFICATION OF DISTRIBUTION SYSTEMS

 

A distribution system may be classified according to ;

 

i)Nature of current

According to nature of current, distribution system may be classified as

 

(a)  d.c. Distribution system

(b)   a.c. Distribution system

 

Now-a-days, a.c. system is universally adopted for distribution of electric power as it is simpler and more economical than direct current method

 

ii) Type of construction

According to type of construction distribution system may be classified as

 

(a)Overhead system

(b) Underground system.

 

The overhead system is generally employed for distribution as it is 5 to 10 times cheaper than the equivalent underground system. In general, the underground system is used at places where overhead con struction is impracticable or prohibited by the local laws

 

(iii) Scheme of connection

According to scheme of connection, the distribution system may be classified as

 

(a)Radial system

(b) Ring main system

(c)  Inter-connected system

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