Patent ID: 7312686

Claim:
A sensing transformer comprising: (a) a first transformer segment including: (i) a first magnetically permeable core comprising a sector of a torus having a planar cross-section bounded by a closed curve, said planar cross-section rotated about an axis in said plane of said cross-section but not intersecting said plane of said cross-section; (ii) a winding including at least one turn substantially encircling said cross-section of said core; and (iii) a first segment housing retentively sheathing said winding and a portion of said first core; and (b) a second transformer segment separable from said first transformer segment, said second transformer segment including: (i) a second magnetically permeable core comprising another sector of said torus; and (ii) a second segment housing retentively sheathing a portion of said second core, said second segment housing separable from said first segment housing to enable separation of said first and said second transformer segments and joinable to said first segment housing to restrain said first and said second cores in a substantially toroidal arrangement.