How to suppress power line spike interference in a power line carrier PLC?

Suppressing power line spike interference in power line carrier PLCs requires a multi-level protection network. At the power line inlet, a 2R600L-8×6 gas discharge tube is first deployed to absorb high-energy lightning surges. The second level uses a 14D511K varistor with a response time of less than 25ns to clamp medium-energy spikes. The third level employs a TVS diode SMCJ24CA to clamp low-energy fast spikes. For differential-mode spikes, an X2 safety capacitor is connected between the live and neutral wires to provide high-frequency bypass. Simultaneously, a PBZ1608E600Z0T ferrite bead is connected in series in the carrier coupling circuit to suppress high-frequency components of the spikes. This three-level protection architecture effectively suppresses 8/20μs waveforms, 6kV lightning surges, and 100kHz repetitive spike interference, ensuring reliable operation of the carrier communication module.