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 |