A. Electromagnetic induction
B. Electrostatic induction
C. Both 1 & 2
D. None of the above
Answer: C. Both 1 & 2
Explanation:
High voltage transmission lines and substations can cause radio interference.
Since radio noise is associated with corona, it mainly depends on the potential gradients at the conductors.
Radio interference due to corona is of the importance for lines above 200 kV.
In electromagnetic effect, the current flowing in the power line produces magnetic flux linkage with the communication line conductor which induces an emf in the telecommunication line conductor.
An electrostatic affect the electric field is produced by the charges of the earth induces a voltage in between the conductors of the telecommunication lines.
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