Saturated core type superconductive current limiter with cable-wound AC winding structure

Abstract

The invention discloses a saturated core type superconductive current limiter with a cable-wound AC winding structure, comprising a reactive system, a DC control system, a monitoring system and a low-temperature system, wherein the reactive system comprises an iron core, an AC winding and a DC winding; the AC winding is wound by at least one turn of cables, and both ends of the AC winding are provided with cable joints; and the cables can be dry-type power cables and oil-filled type power cables or superconducting cables. In the cable-wound AC winding structure, the cables have major insulation per se, and equipment is of a dry-type insulating type; in addition, the invention has the advantages of compact structure, safety, reliability and environmental protection, no need of maintenance, reduces the complexity of an equipment manufacturing process, prevents the complex structure of oil immersion insulation and the potential safety hazards and provides a more extensive space for optimizing the integral structure of the equipment and reducing the volume, the weight and the manufacturing cost of the equipment.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic equipment, in particular to a saturated core type superconducting current limiter. Background technique [0002] Because the saturated core type superconducting current limiter has excellent working characteristics of steady-state low resistance and short-circuit high resistance, it is currently the best option for solving the short-circuit current of the high-voltage power grid. The saturated iron core type superconducting current limiter is composed of a reactance system, a DC control system, a monitoring system and a low temperature system. The reactance system is mainly composed of an iron core, an AC winding and a DC winding. [0003] The AC and DC windings of the saturated core type superconducting fault current limiter generally have two coupling modes: tight coupling mode and loose coupling mode. [0004] For the composition of the tightly coupled AC and DC windings of the saturat...

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Problems solved by technology

[0007] However, the current structural design of superconducting current limiters has certain limitations, especially based on the insulation safety problem caused by high-voltage level tight coupling is a major design problem: for high-voltage levels, the high-voltage winding is inside, the low-voltage The tight coupling structure outside the winding makes insulation difficult, making and maintaining difficult. In addition, the diameter of the control DC winding increases, thereby increasing the amount of DC winding material. For superconducting current limiters, the DC winding is superconducting. Strip, the price is more expensive, thus increasing the production cost

[0008] For the loose coupling method, the applicant invented a compact iron core structure (application number is 200710097089.8), which solved the insulation problem of traditional AC winding design and production of superconducting current limiters, but at the same time sacrificed the coupling coefficient of AC and DC windings. cost

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