Problem 1 The parameters for a 500kV 3 transmission system w

Problem 1. The parameters for a 500-kV 3 transmission system with bundled conductors are as follows: Zc = 250 and R = 1.75x10-2 /km. Please calculate the value for the Surge Impedance Loading SIL and the percentage power loss in this transmission line if it is 300 km long and is loaded to its SIL.

Problem 2. The 500- kV line of the type in Problem 1 is a short- length line, 75 km long. It is loaded to three times its SIL. Please calculate the power loss in this line as a percentage of its loading.

Solution

1)surge impedance loading =V^2/Zc

Per phase voltage =500kv/1.732=288kv

SIL=288^2k/250=331.76kw