Mineral insulated cable, method of manufacturing a mineral insulated cable, and method and system for heating a substance
AssigneeShell USA, Inc.
InventorsDhruv ARORA, David Booth BURNS
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Abstract
A mineral insulated cable includes an elongate core comprising a conducting ceramic-based material having a negative temperature coefficient. The elongate core is arranged on a central axis of the mineral insulated cable, and surrounded by an electrically insulating layer which comprises a mineral material. The conducting ceramic-based material is conductive relative to the electrically insulating layer. A metallic outer sheath concentrically envelopes around the electrically insulating layer. A current may be passed through the elongate core at high voltage, to generate up to 15 kW per meter of cable in heat.
Claims15
A mineral insulated cable, comprising:
- an elongate core on a central axis of the mineral insulated cable;
- an electrically insulating layer concentrically enveloping around the elongate core, comprising a mineral material;
- a metallic outer sheath concentrically enveloping around the electrically insulating layer;
- wherein the elongate core comprises a conducting ceramic-based material having a negative temperature coefficient.
A method of manufacturing a mineral insulated cable, comprising:
- selecting a conducting ceramic-based material, a metallic outer sheath, and an electrically insulating mineral material;
- manufacturing an intermediate assembly comprising:
- providing an elongate core comprising the conducting ceramic-based material;
- placing the elongate core on a central axis of the mineral insulated cable;
- arranging an electrically insulating layer comprising said mineral material concentrically enveloping around the elongate core;
- and
- arranging the metallic outer sheath concentrically enveloping around the electrically insulating layer;
- and
- subjecting said intermediate assembly to diameter reduction comprising steps of mechanically working and heat treating.
Dependencies are inferred from the claim text.