Novel structure of high-voltage superconducting current limiter

Abstract

The invention discloses a novel structure of a high-voltage superconducting current limiter, comprising a superconducting current limiter system and an oil tank unit, wherein the superconducting current limiter system comprises an iron core winding, a refrigerating system, a DC control loop and a monitoring system, wherein the iron core winding comprises a single-phase or three-phase iron core, an AC winding and a DC exciting winding; the oil tank unit provides insulation for a superconducting current limiter AC winding; and only the AC winding is arranged in the oil tank unit. The novel structure of the high-voltage superconducting current limiter solves the problems of overlarge temperature difference between the AC winding and the DC exciting winding and difficult line outgoing of the DC exciting winding by taking a measure of only placing the AC winding into an oil tank, can be flexibly applied to a single-phase or three-phase saturated iron core type superconducting fault currentlimiter and has the advantages of compact structure, small size and resource saving.

Description

technical field [0001] The invention relates to a single-phase or three-phase saturated iron-core type superconducting fault current limiter, which is suitable for high-voltage electromagnetic equipment with DC excitation windings and AC working windings, and is especially suitable for single-phase or three-phase saturated iron-core type used in high-voltage power grids Superconducting fault current limiter. Background technique [0002] In some electrical equipment using insulating oil as a high-voltage insulation and heat dissipation medium, such as a saturated core type superconducting fault current limiter, it is mainly composed of a reactance system, a DC control system, a low temperature system and a monitoring system. Among them, the reactance system is composed of iron core, AC working winding and DC excitation winding; the low temperature system is composed of low temperature Dewar and refrigerator. The insulation between the AC working winding and the DC excitatio...

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Problems solved by technology

[0003] For the saturated iron core type superconducting fault current limiter, because it has a low-temperature system-Dewar, if it is placed in the oil tank, it will cause a large temperature gradient difference between the Dewar and the winding, and the Dewar with a lower oil temperature The distribution and fluidity of the surrounding medium are not uniform, and the strength of the insulating oil is reduced, resulting in a high electric field and uneven distribution of the electric field; at the same time, there are great difficulties in the connection of the lead wires of the low temperature system-Dewar in the oil tank and regular maintenance; in addition, AC The oil tank shared by the working winding, the iron core and the DC control winding still has problems such as a large amount of insulating oil, a large volume of the oil tank, difficulties in transportation, and difficulties in on-site assembly.

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