Induced Voltage on Parallel Phone Line

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SUMMARY

The discussion focuses on calculating the induced voltage on a telephone line parallel to a power line carrying 200A at 60 Hz. It is established that the radius of the lines can be treated as zero due to the assumption of no resistance. The configuration of the telephone line as twisted pairs minimizes the magnetic field exposure and the area available for electromagnetic induction, resulting in negligible induced voltage. Key factors include the distance between the lines and the current in the power line.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Knowledge of twisted pair wiring configurations
  • Familiarity with AC current characteristics, specifically 60 Hz
  • Basic concepts of magnetic fields and their interactions with conductors
NEXT STEPS
  • Research the mathematical models for calculating induced voltage in parallel conductors
  • Explore the effects of distance on electromagnetic induction
  • Study the properties and applications of twisted pair cables in telecommunications
  • Learn about the impact of AC current frequency on induced voltages
USEFUL FOR

Electrical engineers, telecommunications professionals, and students studying electromagnetic theory will benefit from this discussion, particularly those interested in the effects of power lines on nearby communication lines.

sandy.bridge
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Homework Statement


If we know the orientation of a power line that is parallel to a telephone line, how can we determine the voltage induced on the telephone line without knowing the radius' of the lines? We are told the power line is at 200A at 60-Hz, we know how far each of the lines are from each other, but we do not know the radius of each of the lines.
 
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Since we're assuming that there is no resistance in these lines, the radius of the copper should be treated as zero.
Apparently there is no load on the phone line.
 
The telephone and power wires are most probably twisted pairs. That means that (a) there is very little B field escaping the power line, and (b) there is very little area between the telephone wires to pick up an emf.
 

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