Electrical inductive apparatus having magnetic shielding loops

Claim 1

Single-phase electrical inductive apparatus, comprising: a magnetic core assembly having a main core loop and first and second shielding loops; said main core loop having a plurality of superposed layers of metallic laminations, each having a width dimension A, with each of said layers including a plurality of laminations assembled to provide a closed magnetic loop and define a substantially vertical opening therein; said first and second shielding loops each having a plurality of superposed layers of metallic laminations having a width dimension less than A/3, with each layer including a plurality of laminations assembled to provide a closed magnetic loop and define a substantially vertical opening therein, said fiRst and second shielding loops being disposed adjacent opposite sides of said main core loop, with the axes of the openings in said first and second shielding loops being parallel with the axis of the main core loop, and in the same plane; first and second electrical winding means disposed to encircle said main core loop and said first shielding loop, and said main core loop and said second shielding loop, respectively, to provide a magnetic core-winding assembly; a tank including sidewall and bottom portions; said magnetic core-winding assembly being disposed in said tank, and oriented with the axes of the openings in the main core loop and the first and second shielding loops perpendicular to the bottom portion of said tank, to dispose the main core loop and first and second shielding loops between said first and second electrical winding means and the sidewall portions of said tank.