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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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WHERE DOES A CITIZEN GO FOR HELP WHEN LOCAL GOV BREAKS LAW?
You could call the State, but sometimes it works better if you call the "Action Line" of your local newspaper, TV station or radio station. Sometimes shame and bad publicity works better than laws. Or, you can hire a lawyer and file a lawsuit.
