... 8 28 Annotate T| Edit 97% v - + eFinal_2020_Rules A A A eFinal_2020 O O Toi Problem B. EMTP Ideal Line (20 marks) A transmission line with the receiving end short circuited is energized with a unit step function. I=90 km A to K a = 300 Kmus Zc ss00 0 7 vf st=10ous short, circuted ZCA Uxl4C ix(t) Chr(t) ehut) int) Velt) t Chw(t) = Uk (t-2) + Zc 4 (t-2) ehk (t) = Vnit-)+ Zc ive (t-a) Assume zero initial conditions. Plot the current at the receiving end m from t = 0 to t = 500 us with At = 100 us by two methods: 1. By elementary wave propagation theory. (10 marks) 2. Using the EMTP cp-Line model for an ideal line. (10 marks) Problem C. Conceptual Questions (20 marks) (4 marks each) (4 marks bonus) 1. Indicate three reasons why mixed transformer connections (e.g., Y-A, or A-Y) are preferred over non-mixed connections (e.g., Y-Y, or A-A). Show the connection mana caile to malo V20 and 1.7 of connection ... 8 28 Annotate T| Edit 97% v - + eFinal_2020_Rules A A A eFinal_2020 O O Toi Problem B. EMTP Ideal Line (20 marks) A transmission line with the receiving end short circuited is energized with a unit step function. I=90 km A to K a = 300 Kmus Zc ss00 0 7 vf st=10ous short, circuted ZCA Uxl4C ix(t) Chr(t) ehut) int) Velt) t Chw(t) = Uk (t-2) + Zc 4 (t-2) ehk (t) = Vnit-)+ Zc ive (t-a) Assume zero initial conditions. Plot the current at the receiving end m from t = 0 to t = 500 us with At = 100 us by two methods: 1. By elementary wave propagation theory. (10 marks) 2. Using the EMTP cp-Line model for an ideal line. (10 marks) Problem C. Conceptual Questions (20 marks) (4 marks each) (4 marks bonus) 1. Indicate three reasons why mixed transformer connections (e.g., Y-A, or A-Y) are preferred over non-mixed connections (e.g., Y-Y, or A-A). Show the connection mana caile to malo V20 and 1.7 of connection