Research on Magnetic Field Detection Method for Live State of High Voltage Direct Current Transmission Lines

Electroscope plays an important role in judging the charged condition of transmission lines and the operating conditions of transmission lines. The commonly used contact electroscope has the disadvantages of cumbersome measurement steps and easy to cause safety hazards to workers. This paper proposes a new type of non-contact electroscope using magnetic field detection to detect power lines. In this paper, the basic principle of the high voltage DC magnetic field electroscope is sorted out, and then the hardware circuit module is built and the software program is compiled. In the finite element software, the distribution characteristics of the magnetic field around the HVDC transmission line under different working conditions and the attenuation characteristics of the magnetic field under different paths are simulated and analyzed. The electroscope alarm threshold is extracted under different analysis paths and different operating conditions. Finally, the developed high-voltage DC magnetic field electroscope was tested. In the experimental test, it was found that the high-voltage DC magnetic field electroscope has good performance, and there are no dead zone and false alarm problems, which can be effectively applied in practical engineering.