The
classification of the transmission line is done according to the line voltage
and length of the line.
( 1 ) Short
transmission line
Length of line
< 50 km
Voltage < 20 kV
- The effect of capacitance is neglected in the short transmission line whereas the effect of resistance and inductance is taken into account.
( 2 ) Medium
transmission line
Length of line :
50 km to 150 km
Voltage : >
20 kV and < 100 kv
- The effect of capacitance is considered in the medium transmission line.
- The medium transmission line is further classified on the basis of considering the effect of capacitance.
- Nominal T method : Total capacitance is considered at the center of the line
- Nominal π method : Half capacitance is considered at the sending end and half capacitance at the receiving end side
- End condenser method : Total capacitance is considered at the receiving end of the transmission line
( 3 ) Long
transmission line
Length of line :
> 150 km
Voltage of the
line > 100 kV
- It is considered that the line constants ( resistance, capacitance and inductance ) are uniformly distributed across the line and rigorous method is employed for the solution of the transmission line.
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