Circuit-slide-5 - Transient and Steady-State on a...

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Transient and Steady-State on a Transmission Line We need to give now a physical interpretation of the mathematical results obtained for transmission lines. First of all, note that we are considering a steady-state regime where the wave propagation along the transmission line is perfectly periodic in time. This means that all the transient phenomena have already decayed. To give a feeling of what the steady-state regime is, consider a transmission line that is connected to the generator by closing a switch at a reference time t = 0 . For simplicity we assume that all impedances, including the line characteristic impedance, are real.
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After the switch is closed , the voltage at the input of the transmission line will vary nearly instantaneously from the open voltage of the generator V G to a value V + , with a current I + beginning to flow into the line. A transient takes place in the transmission line, as charges in the conductors move, transporting the current towards the load. Until the front first reaches the end of the transmission line, the load voltage remains zero. Initially, the
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This note was uploaded on 03/09/2012 for the course ECE 450 taught by Professor E.kudeki during the Spring '12 term at Illinois College.

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Circuit-slide-5 - Transient and Steady-State on a...

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