Ground fault sensor current transformer

Abstract

Abstract The transformer includes a rectangular core of ferromagnetic metal, such as iron, having four legs disengageably interengaged, at the corners of the core, at right angles to each other. Each leg is constituted by several laminae of iron, and the laminae are interleaved at the four corners. The laminations of each leg are secured so that the core will maintain a true rectangular shape. Secondary winding sections are wound on two legs of the core which are parallel to each other, the windings being wound on insulation tubes and preferably being connected in series with each other. Respective outer tubes of dielectric material are telescoped over each leg, so that the winding sections are enclosed. Four split corner brackets of dielectric material, preferably molded, are provided, and each bracket receives and clamps the ends of two outer tubes at a respective corner of the core. The two brackets connecting a third leg of the core to corresponding ends of the two legs carrying the windings are readily removable, together with the tube and the core leg extending therebetween, to provide for installation of the transformer over existing duct work and bus-bars. One of the corner brackets connecting the fourth leg of the core to the two legs carrying the windings is provided with externally accessible terminals connected to the winding sections, whereby the secondary winding of the transformer, constituted by the interconnected winding sections, may be connected to ground current sensor components.

Inventors

• 👤 John A Pagon
• 👤 Spotz Erwin

Bibliographic Details