Comparison of 2D 3D models for simulations of electric-field in OVS

摘要

In this paper, the basic principle of Optical Voltage Transformer (OVT) based on Pockels effect is introduced. A comparison is made between transverse Pockels effect and longitudinal Pockels effect. And OVT is unable to present the distribution of internal field directly. Therefore, it is necessary to simulate its electric filed, and the accuracy of the simulation results is important for OVT's design. For the axisymmetric model, in order to improve the efficiency of calculation a three-dimensional (3D) structure is usually simplified as a two-dimensional (2D) model. To compare and analyze the differences between the calculated results obtained by using OVT's voltage sensor head with 2D and 3D models, different shapes of BGO crystal in voltage sensor head are constructed respectively, and the finite element simulation software Ansoft Maxwell is used. The simulation results indicate that the maximum electric field intensity is quite different between 2D and 3D models of sensor head. And in the 3D simulation, different shapes of BGO crystal have different maximum electric field intensity of the sensor head. Compared with 2D simulation, 3D simulation is more real. So in an actual operation situation, it should analyze the OVT with 3D model.