That is one possible way to have communications in transmission network. Another technology, which is implemented in transmission network, is optical fibers. Optical fibers mostly mounted inside ground wires on overhead lines. In that case, special equipment on the end of fibers are needed.

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Wavetrap the inductive coil offers no reactance to power frequency’s signal and considerably large to communication signal, as Xl= 2(pai)fL....

The best solution for communication is to use OPGW cable (optical power ground wire) for the lightning protection of the overhead line. The o

Sorry, I must continue.

The optical fibers within the OPGW cable are used for communication.

The thecnology of frequency modulation over the power oberhead line conductots, associated with line traps and capacitors (acting as filters) is nowadays out of use and the realibility in communicatiomis much lower than the optical fibers.

Also the amount of data with optical fiber is higher.

in the more or less recent past, since some companies still use it, power lines were used to make communications between substations in high voltage networks. but with technological development this technique is being abandoned in view of its imperfections in terms of the quality of transmission and the phenomena that it may generate in favor of fiber optics that not only allow communication between the stations but also ensure between network protection systems that are digital days. these fiber optic technologies have many advantages and facilitate flexibility in the operation of electrical networks. for example in Benin we have a huge project that has started to replace all LC systems with optical fiber.