Coupling capacitors are important equipment in the high-frequency channel of the power system and are used to transmit signals in the power network. They are mainly used in power frequency high-voltage and ultra-high voltage AC transmission lines to achieve carrier wave, communication, measurement, control, protection, and energy extraction purposes. It couples and isolates the strong and weak current systems through capacitors, providing a high-frequency signal path to prevent power frequency currents from entering the weak current system and ensuring personal safety
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