Patent ID: 11955781
Assignee: SCHNEIDER ELECTRIC USA, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A draw out circuit breaker with reduced partial discharge in insulation surrounding a primary stab bus, comprising:
a circular disk plate with an inward-facing surface placed coaxially on one end of a cylindrical conductor, the disk plate including a plurality of raised embosses formed on the inward facing surface of the disk plate and positioned along a circle coaxial with the conductor, the embosses facing in an inward axial direction from the inward-facing surface of the disk plate, the embosses placed at a radial separation distance from an outer cylindrical surface of the conductor; and
an insulator sleeve surrounding the conductor, having an annular cross section with a radially inward-facing surface and an end portion flush with the raised embosses on the circular disk plate, the end portion of the insulator sleeve having encapsulating portions that encapsulate a plurality of tapped inserts positioned along a circle coaxial with the annular insulator sleeve and aligned with the raised embosses on the circular disk plate, each of the tapped inserts of the insulator sleeve abutting a respective one of the raised embosses and fastened thereto by a respective screw to support the circular disk plate and cylindrical conductor in a mutually coaxial configuration with the annular insulator sleeve,
wherein the raised embosses on the circular disk plate separating the end portion of the insulator sleeve by a first gap distance from the inward facing surface of the disk plate, are configured to reduce formation of a triple point region between the surface of the disk plate and the insulator sleeve, thereby reducing occurrence of partial discharges in the insulator sleeve near the first gap; and
wherein the encapsulating portions of the insulator sleeve surrounding the inserts having a radially inward-facing surface separated by a second gap distance from the outer cylindrical surface of the conductor, are configured to reduce formation of a triple point region between the outer cylindrical surface of the conductor and the insulator sleeve, thereby reducing occurrence of partial discharges in the insulator sleeve near the second gap.