基于悬空场磨的空间直流合成电场测量研究

With the increasing scale of UHV DC transmission projects and the gradual opening of low-altitude airspace in China, the demand for space electromagnetic environment monitoring around transmission lines is becoming more and more urgent. However, there is no instrument and method to measure spatial DC electric field effectively so far. Rotating field-mills are widely used in the measurement of ground-level DC synthetic electric field, but applying the existing field-mill to measure spatial DC electric field directly may cause large measurement error. Aiming at this, the electric field sensor analytical model and a finite element calculation model that couple space charge and wind factors to calculate and analyze the influence of space charge on measurement of spatial DC synthetic electric field. In addition, an experimental platform with DC test lines for the four experimental scenarios was established. The effects of space charge with wind on field-mill were analyzed in experimental comparisons, the sensor measurement errors were researched using ungrounded field-mill quantitatively, and the measurement errors were controlled within a certain range through the correction algorithm. The experimental results provide a useful reference for the accurate measurement of the spatial electromagnetic environment of the high-voltage DC transmission line.