Electromagnetic Radiation Analysis of the Potential Transfer Arc During Live Working on the UHV Transmission Line

The process of potential transfer is an important process during live working on the UHV transmission lines, and the arc produced during the potential transfer process may generate electromagnetic radiation interference to affect the surrounding environment. In order to study the electromagnetic radiation characteristics of the potential transfer arc, the potential transfer experiment in the process of entering equal-potential along the tension string of 1000 kV AC transmission line is conducted, and the potential transfer current is measured. The spectrum characteristics of the potential transfer current are studied by using wavelet analysis, and the main frequency band distribution of the transfer current pulse is obtained. Then, the changes of the radiated electric field and magnetic field caused by the potential transfer arc are calculated based on the dipole antenna theory. Results indicated that the frequency band of the potential transfer current is mainly in 12.5~25 MHz, and the radiated electromagnetic increases in the far-field area with the increase of potential transfer current.