Analysis of potential transfer current characteristics of live workers in UHV AC line based on helicopter winch method

In order to further ensure the safety of UHV line helicopter live operation, the characteristics of potential transfer current for live operators are analyzed. Based on the characteristics and line parameters of on-line maintenance with helicopter winch method, the circuit model of potential transfer for operators is analyzed and the potential transfer current for 1000 kV UHV AC line is simulated. The actual measurement of potential transfer current was carried out by a measuring system triggered by pulse current acquisition and storage, and the current waveform showed pulse characteristics. Statistical analysis was carried out on the number of positive and negative polarity pulses, current peak value, average amplitude and maximum pulse width within 1000 ms. The maximum pulse current peak value exceeded 1000 A, and the simulation calculation and measurement results were in good agreement. The research results provide a technical basis for carrying out helicopter live working safely.