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Line traps are used to restrict high-frequency communication/protection signals to the length, or section, of transmission lines to which these signals apply. They are found in substations, not power stations, and can be seen hanging off transmission-line terminal towers.

Line traps are inductors whose inductive reactance opposes the flow of a.c. current and is directly-proportional to frequency. Line traps are used to block, or significantly attenuate, high-frequency signals that are impressed on the line for the purpose of communcations/protection, while having an insignificant effect on the supply-frequency (50/60 Hz) current.

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