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Question

# An overhead line 300 km long and having surge inpedance loading of 100Ω. The line is open circuited at the receiving end and voltage of 500V is applied to the other end. Calculate the sending end voltage and current after 0.002 sec

A
500 V, -5A
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B
1000 V, +5A
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C
500 V, +5A
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D
500 V, -10A
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Solution

## The correct option is A 500 V, -5AIncident voltage V = 500 V Incident current I=VZc=500100=5A Time taken to reach 300 km T=300km3×105km/sec=0.001 sec After 2T = 0.002 sec, voltage and current at sending end side are Vs=V=500 V Is=−I=−5A

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