Fault current limiter
AssigneeZenergy Power Pty Ltd.
InventorFrancis Anthony Darmann
Life of this patent
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Abstract
A fault current limiter (FCL) includes a series of high permeability posts (1) for collectively define a core for the FCL. A DC coil (2), for the purposes of saturating a portion of the high permeability posts (1), surrounds the complete structure outside of an enclosure in the form of a vessel (3). The vessel (3) contains a dielectric insulation medium (4). AC coils (5), for transporting AC current, are wound on insulating formers (6) and electrically interconnected to each other in a manner such that the senses of the magnetic field produced by each AC coil (5) in the corresponding high permeability core are opposing. There are insulation barriers (7) between phases to improve dielectric withstand properties of the dielectric medium.
Claims34
A fault current limiter for incorporation into an electrical circuit, comprising:
- a magnetically saturable core;
- at least one AC phase coil wound around a portion of the saturable core, wherein the magnetically saturable core and the at least one AC phase coil are housed within an enclosure;
- and
- at least one DC biasing coil disposed outside of and surrounding the enclosure which during no fault operating conditions of the current limiter biases the core into magnetic saturation for low insertion impedance but during fault conditions takes the core out of magnetic saturation to thereby provide an increased current limiting impedance in the electrical circuit;
- wherein the magnetically saturable core and the AC phase coils are immersed in a dielectric.
A fault current limiter for incorporation into an electrical circuit, comprising:
- a magnetically saturable core;
- at least one AC phase coil wound around a portion of the saturable core, wherein the magnetically saturable core and the at least one AC phase coil are housed within an enclosure;
- and
- at least one DC biasing coil disposed outside of and surrounding the enclosure which during no fault operating conditions of the current limiter biases the core into magnetic saturation for low insertion impedance but during fault conditions takes the core out of magnetic saturation to thereby provide an increased current limiting impedance in the electrical circuit;
- wherein the DC biasing coil is in the form of a race track DC coil.
Dependencies are inferred from the claim text.