A Non-contact Voltage Measurement Method for Ultra-High Voltage DC Transmission Tower

The traditional voltage measurement for the Ultra-High Voltage DC transmission line faces many problems such as high volume and high insulation cost. The non-contact voltage measurement method can solve those problems and improve measurement accuracy. This paper applies the Chebyshev integral method and the Gauss-Legendre integral method to the electric field inversion problem and takes the inductors as the integral interval. The errors of these methods can be less than 0.5%. The windy situation is also considered to test the sensibility of these methods, which shows that the error in the windy situation can be less than 1.5%.