Application of Kerr electro-optic effect to electric field measurements in transformer oils

This paper presents an original method suitable for measurement of electric field distribution in liquid dielectrics (nanosecond time domain). Electric field is reconstructed in two steps: 1) multiangular laser scanning of inter-electrode space provides projections for each laser beam, 2) using a numerical algorithm called Modified Arithmetic Reconstruction Technique (MART) electric field is reconstructed in the plane of laser scanning. Finite Difference Method (FDM) is used to compare and verify experimental results for symmetrical and asymmetrical electrode configurations. Comparison of experimental (Computerized Laser Tomography) and numerical approach (FDM) confirmed that experimental approach is accurate enough to be used in initial design of many oil-immersed dielectric systems.