Optimum design of calibration device for field mill type electric field sensor based on finite element method

Abstract

Field mill type electric field sensors are widely used to measure the total electric field at ground level under the high voltage direct current( HVDC) transmission lines. The size of the traditional calibration device is extremely large and it is not very convenient to move for outdoor measurement usage. To overcome this disadvantage,a new kind of reduced scale calibration device with preferable portability was elaborated applied in measurement of the total electric field at ground level under the high voltage direct current transmission lines. The finite element analysis method was employed to establish the three dimensional model of the electric field sensor calibration device. The numerical simulation analysis based on the finite element method was made with the respect to the dimension and structure and other key parameters for the portable calibration device. The structure parameter of the calibration device was optimally designed based on the simulation result. In addition,the reduced-scale portable calibration device was compared with the traditional calibration device by experiments. Based on the experimental and the simulation results,the proposed portable device demonstrates that it can accomplish the accurate and flexible demands of the electric field calibration.