Alarm threshold settings and field test of non-contact MEMS UHVDC electroscope

Although a number of 800kV UHVDC (Ultra High Voltage Direct Current) transmission lines have been built, there is lack of general UHVDC electroscope equipment and relevant standards. Therefore, a non-contact electroscope based on MEMS (Micro-Electro-Mechanical System) is proposed in this paper. The reasonable measuring position of the electroscope is selected. The distribution of electric field of UHVDC transmission lines in different operating modes, such as double-pole operation and single pole operation, are obtained through simulation and analysis. The alarm threshold of electroscope is set and the field test is carried out. The effectiveness of the electroscope is verified.