First, the principle of the single-phase optical current transformer by the present invention will be explained one by one referring to
FIG. 1 that is a schematic vertical sectional view. In the invented single-phase optical current transformer, on a part of a cylindrical container
1, inside which an electric conductor
2 is arranged, a Faraday-effect element
10 is placed being intersect, when sectionally viewed, to the axial direction of the electric conductor
2; in other word, the Faraday-effect element
10 is disposed so as to be intersected to the direction the current.