Consider the following 230 kV overhead-line/cable/overhead-line circuit. Conside

Question

Consider the following 230 kV overhead-line/cable/overhead-line circuit. Consider

that there is a 100 kV square wave traveling down A towards B in the forward

traveling direction, which is initiated at the beginning of A.

a) What are the reflection and refraction/transmitted coefficients of a wave

traveling in the direction from A to B at the Junction AB?

b) What are the reflection and refraction/transmitted coefficients of a wave

traveling in the direction from B to C at the Junction BC?

c) What are the travel times for Line A, Cable B, Line C?

d) What is the peak of the first voltage wave just after it hits the termination of

Line C (open circuit)?

Explanation / Answer

travel times are just length/velocity

so for line A travel time = 50/(300*106) = 166 nanoseconds

so for line A travel time = 25/(150*106) = 166 nanoseconds

so for line A travel time = 50/(300*106) = 166 nanoseconds

peak of the first voltage wave will be = 100*tA*tB*tC = 100*0.4*(12/7)*2 =137.142KV

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