Statistical evaluation and numerical analysis of effect of transverse wind on ionized field of ±800 kV UHVDC operating transmission lines

- The on-site statistical measurements of the ionized field of ±800 kV ultra-high voltage direct current (UHVDC) lines have been carried out in the presence of different transverse wind velocities.
- The inception conditions are calculated accurately, considering the wavelength of photoionization and photoemission replenishment.
- The ion current environment of the real-size UHVDC transmission lines is simulated by upstream-FVM.
- The impact of wind on the ion current environment is obtained by simulations and measurements.

The effect of transverse wind on the ionized field of ultra-high voltage direct current (UHVDC) projects has not been thoroughly evaluated due to the lack of the long-term statistical measured data under the natural circumstance. In this work, the on-site statistical measurements have been carried out in the presence of different transverse wind velocities. In addition, based on the steady state ionized field model, the ion current environment of the real-size UHVDC transmission lines is simulated by upstream finite volume method to obtain a better physical understanding of the impact of wind. Meanwhile, the corona inception conditions are calculated accurately, considering the wavelength of photoionization and photoemission replenishment. The statistical results show a large oscillation under transverse wind velocities. The impact of wind on the ion current density profile is even more notable than that on the resultant electric field. The on-site statistical measurements are coherent with numerical simulation.