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it is a high resistive paralell rezonans circuit which allows to cary signals between to electric station with limited bandwith

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Line traps are a large inductors, suspended at the end of a high-voltage transmission line which prevents high-frequency communications/protection signals from travelling beyond that point, by attenuating those signals. The inductive reactance of the inductor presents a high reactance to high-frequency signals but a low reactance to mains frequency (50/60 Hz).

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