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2825results about "Transformers/inductances casings" patented technology

Planar inductive element

A storage magnetic element, which minimizes the power loss in the planar winding due to the fringe magnetic field associated with a discrete air gap, is presented. The invention describes a construction technique wherein the magnetic core is formed by an E section made of high permeability magnetic material and an I section made by a material capable to store energy due to its distributed gap structure. The I section of the magnetic core in one of the embodiments is covered by an electrically conductive shied to force the magnetic flux into the I section and to minimize the component of the fringe magnetic field perpendicular on the planar winding. In another embodiment of this invention the electrically conductive shield is replaced by a high magnetic permeability material to accomplished the same goal of reducing the magnetic field component perpendicular on the planar winding. In a prefer embodiment of this invention the I section of the magnetic core has a cavity which will accommodate the middle leg of the E section. This construction will force the fringe magnetic field at the edge of the gap to be parallel with the planar winding of the storage magnetic element. In another embodiment of this invention a flat I section is used with the addition of another high permeability magnetic material placed on the I section on top of the winding. This construction will force the fringe magnetic field around the edge of the gap to be parallel with the planar winding. The embodiments of this invention are aimed at reducing the fringe magnetic field perpendicular on the planar winding, lowering the eddy current induced by this field.
Owner:DELTA ENERGY SYST SWITZERLAND

Opening current transformer capable of being installed in powered-on mode

The invention discloses an opening current transformer capable of being installed in a powered-on mode. A shell is divided into two oppositely-connected half cylinders used as a movable semicircular shell body and a fixed semicircular shell body. The two shell bodies are hinged at one oppositely-connected position. A longitudinally-extending movable beam is arranged at an opening of the movable semicircular shell body. A longitudinally-extending fixed beam is arranged at an opening of the fixed semicircular shell body. The fixed beam and the movable beam are blocky bodies and make contact with each other when the two shell bodies are oppositely connected. The contact face of the movable beam and the contact face of the fixed beam are each provided with a longitudinally-extending notch. An upper piercing wire card is arranged in the notch of the movable beam. A lower piercing wire card is arranged in the notch of the fixed beam. The upper piercing wire card and the lower piercing wire card are oppositely connected to form a wire holding hole. The upper piercing wire card and the lower piercing wire card are each provided with metal teeth piercing a bus metal core. The opening current transformer further comprises an opening and closing mechanism making the upper piercing wire card and the lower piercing wire card opened or closed. The opening current transformer is reliable in insulation, capable of being firmly installed on a bus, and capable of being widely applied to occasions for measuring primary current and temperature of the bus.
Owner:ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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