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TRANSMISSION LINES

Transmission lines

The Transmission lines are basically Electrical Circuits having distributed constants such as Resistance,Inductance and Capacitance.These contants are uniformly distributed along the length of the line and there concentration at any particular point is not possible
Basically these Transmission lines are Classified based on two cases,
CASE 1: BASED ON LENGTH:-
The Tranmission lines are classified into three types here
1.Short Transmission Lines:When the length of the Tranmission line is below 60 km then they are considered to be under STL
2.Medium Transmission Lines:When the length of the Transmission line is 80-160 km then they are said to be MTL.
3.Long Transmission  Lines: When the length of the Transmission line is above 160 km then they are said to be LTL.
CASE 2: BASED ON OPERATING VOLTAGE:-
Here the Transmission lines are classified into five types
1.Low Voltage:When the operating voltage is upto 1KV.
2.High Voltage:When the operating voltage is 11KV-33KV.
3.Extra High Voltage:When the operating voltage is 66KV,132KV,220KV.
4.Modern Extra High Voltage:When the operating voltage is upto 400KV.
5.Ultra High Voltage:When the operating voltage is upto 765KV and above.
SELECTION OF OPERATING VOLTAGE:
Cost and Size or Insulation is not the Criteria for the Selection of operation voltage.Power Transfer Capacity is the main criteria for the selection of Operating voltage.

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