... functioning cable performing the duties of a ground wire and also providing a patch for the transmission of voice, video or data ... , especially in lighting waveform monitoring system, an observation system for overhead test line, maintenance data information system, power line ... the double-layer design ranges from 90mm2 to 200mm2, suitable for rated voltages of 150kV, 250kV, 275kV, 380kV and 500kV. ...