What is the effect of line loss on traveling wave transmission?

2022/07/19

Author: Noyafa–CCTV Tester

Question: What is the effect of line loss on traveling wave transmission? Answer: In the above analysis of the line wave process, it is assumed that the line has no loss, that is, R=G=0. The actual power cable line has a large series resistance loss. Skin effect, cable resistance follow-up Question: What effect does line loss have on traveling wave transmission? Answer: In the analysis of the above line wave process, it is assumed that the line has no loss, that is, R=G=0, and the actual power cable line has a large The series resistance loss of the cable increases with the signal frequency due to the skin effect of the conductors. Theoretical analysis and practical test show that the existence of line loss will make the traveling wave attenuate in amplitude and cause distortion during line transmission. Effect of Line Loss on Rectangular Pulse Transmission Suppose a rectangular pulse is injected into the cable, and the shape of the pulse after a certain distance L is transmitted is shown in Figure 2.17.b.

It can be seen that the amplitude of the waveform drops and a tail is dragged. The longer the transmission distance, the more serious the drop in amplitude and the longer the tail of the waveform. The waveform of the DC voltage after transmitting L distance in the cable shows the voltage waveform observed at a certain distance L from the voltage application point by adding a DC voltage at one end of the cable. It can be seen that the voltage rises approximately exponentially. The rise is slower.

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