Chapter 5, Problem 5.36P

4. The characteristic impedance of a transmission line with impedance and admittance of 16 and 9 respectively is a) 25 b) 1.33 c) 7 d) 0.75

For the following transmission line of length d = 3 m, with Zs = 50 N, Z, = 50 N, Z, = 7 – 18j N, and ß = 2.5 rad/m, x = -d x = 0 Zs 120 Zo, B 8) Find I(x = -d) and V(x = -d). h) Find the power delivered to the load. i) Use V (x = -d) and the reflection coefficient to find V, at the load. j) Write the expression for total voltage wave at any point on the transmission line, V (x).

2. Determine V and I of a short transmission line, if Z is... a. -300 +1200 22 and 200- j300 are in series then in parallel with a 400 resistor b. 2002 is in series with 5H and 15µF that are in parallel j320 230230° 60Hz 2002 I M N V

PROBLEM: Determine the Sending end voHage. V, of the nominal-T given transmission line. 122 4002 V -jlo002 400 <30°V j300.2

The ABCD constants of a 60 Hz, 3-phase long transmission lines are as follows B = 191.62/79.1⁰ C = 0.0012/90.4° A=D=0.877/1.57° This supplies 100 MW load at 230 kV with 90% power factor. What is the sending voltage ? A. 248 KV B. 245 KV C 269 KV D. 238 KV

Transmission Lines Communication Principles Example: A lossy TL has a length of 200 Km and its characteristic impedance is Za 683-j1382. The load Zn = Zo is connected to this TL and it source impedance is equal to 5002 with a voltage source of 10 V.r.m.s, the propagation constant for this TL is measured as 7-0.0074+j0.0356 per km. Calculate E., Is. P, and ER, IR. PR-

A 75 km long 60 Hz transmission line is rated at 220 KV and 150 MVA. The line has the following parameters: r= 0.09 Q/Km x= 0.88 02/km y = 4.1 x 10^-60/km The voltage at the load is 210 KV and the load is rated load that is 150 MVA at a power factor (PF) of 0.85 lagging. 1) Find the series impedance of the line. 2) Find the ABCD parameter of the line. 3) What is the sending end voltage? 4) What is the voltage regulation (VR) of the line? 5) What is the percentage efficiency of the line? Note: For TL short line, the capacitance is neglected. In this problem is assumed that this is a balanced three-phase system. So, we need to convert line to line to a single phase.

2. A three-phase transmission line has parameters Xc-6 k 2, R-3.25 2 and X₁-25 92, and delivers 300 MW to a load with both ends of the line at 230 kV. Draw a pi equivalent per-phase circuit of the line. On a per-phase basis, calculate the active power delivered to the load, the reactive power of the line and the active power delivered by the source. Based on these calculations can the equivalent circuit be simplified further?

Question 1 A three-phase, 50 Hz overhead short transmission line has a line-to-line voltage of 11V3 kV at the receiving end, a total impedance of 3 + j4 0/phase, and a load of 33 MW with a receiving-end lagging PF of 0.707. a. Calculate the line-to-neutral voltage at the receiving end. b. Calculate the line current. c. Calculate the line-to-neutral at the sending end. d. Calculate the line-to-line voltages at the sending end. e. Calculate the load angle.