Questions -
Q1. Derive the mathematical model of a long transmission line (ABCD parameters), Length > 250 km, and specify its important characteristics? What is the difference between short transmission line model and long one (compare and discuss)?
Q2. What is Ferranti effect and how it occurs? Please use ABCD parameters for transmission line to discuss about it?
Q3. Given the parameters for the first segment (75 km) of the artificial transmission line (laboratory session) as below:
R = 2.5 Ω, C = 0.2*10-6 F, L = 44*10-6 H, f = 50 Hz
Calculated the ABCD parameters for full length 300 km, propagation constant (y) and Impedance characteristics (Zc)? Calculate the voltage at the receiving end under no-load test for three-phase configurations (assuming the sending-end Line-Line voltage is 415V)? Calculate the short circuit current at the receiving end of the artificial transmission line?
Q4. Explain what the skin effect is and how we can reduce it?
Q5. Explain the mutual coupling and explain why in artificial transmission line experiments for no-load test the receiving end voltage in single-phase configuration had lower voltage than the sending end voltage?
Q6. What is surge impedance and how surge impedance loading (SIL) is utilized for efficient power transfer?
Q7. Derive the power flow equation through sending and receiving end of a typical transmission line? What are the parameters than can be manipulate to increase power flow in transmission line? Illustrate the phasor diagram between sending end and receiving end of a transmission line?
Q8. What is voltage regulation of a transmission line and how it depends on the power factor (please also use phasor notation to illustrate the concepts)? Is there a situation where the receiving end voltage is greater than sending end voltage?
Q9. Why power transmission lines are three-phases rather than 1, 2, or 5?