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 for collectively define a core for the FCL. A DC coil, for the purposes of saturating a portion of the high permeability posts, surrounds the complete structure outside of an enclosure in the form of a vessel. The vessel contains a dielectric insulation medium. AC coils, for transporting AC current, are wound on insulating formers and electrically interconnected to each other in a manner such that the senses of the magnetic field produced by each AC coil in the corresponding high permeability core are opposing. There are insulation barriers between phases to improve dielectric withstand properties of the dielectric medium.
Claims16
A fault current limiter, comprising:
- an input terminal electrically connecting to a power source that provides a load current;
- an output terminal electrically connecting with a load circuit that draws the load current;
- a magnetically saturable core;
- an AC coil wound about a longitudinal portion of the core for carrying the load current between the input terminal and the output terminal;
- an enclosure for housing the magnetically saturable core and AC coil, wherein the enclosure includes a cooling means in addition to a dielectric material;
- and
- at least one DC coil for inducing a magnetic field in at least the portion of the core and extending about a longitudinal intermediate zone that receives the core and the AC coil, wherein the field magnetically biases the core such that the AC coil moves from a low impedance state to a high impedance state in response to one or more characteristics of the load current.
Dependencies are inferred from the claim text.