Design of 130 mw, 200 km transmission line

 

Design of 130 mw, 200 km transmission line

The most economical voltage is given by the following empirical formula:

Economical Voltage (V _eco)        

Where,

Ø  Lt = length of transmission line =200 Km

Ø  P = Power to be transmitted =130 MW

Ø  cosØ = Power factor =0.96

Most Economical Voltage Calculation

For Nc= 1	For Nc= 2
Then, using the above values Nearest Standard Voltage= 220 kV	Then, using the above values Nearest Standard Voltage= 132 kV

 

Checking technical criterion

For Nc= 1	For Nc= 2
Surge impedance Loading (SIL) = V2 / Z0  =2202 / 400 =121 Multiplying factor (MF) = = 130/121 = 1.0834 MFlimit for 160 KM from provided standard table = 2.0614 MFcalculated (1.08) < MFlimit (2.0614) Power transfer capability = MFlimi* SIL =2.0614*121=249.4294	Surge impedance Loading (SIL)  = V2 / Z0= 1322/200 =87.12 Multiplying factor (MF) =                         = 130/87.12 = 1.4921 MFlimit for 160 KM from provided standard table = 2.25 MFcalculated(1.1921) < MFlimit (2.0614) Power transfer capability = MFlimi* SIL  =2.0614*87.12=179.58

Since the power transfer capability for double circuit is near to the power to be transferred.  s so Nc=2 is taken in this design. Since the voltage level 132Kv is not meet the voltage regulation for any conductor available. So we have to choose double circuit 220 KV.

 

Voltage Level for given Power Transmission	=220 KV
Number of Circuit	=2
Power Factor ( cosØ )	= 0.96
Length of Transmission Line (L)	= 200Km