Saturated core type superconductive current limiter for strengthening insulating performance through nitrogen

Abstract

The invention discloses a saturated core type superconductive current limiter for strengthening the insulating performance through nitrogen. The saturated core type superconductive current limiter comprises iron cores arranged in an outer shell, alternating current windings and a superconductive direct current winding wrapped in a Dewar bottle with the liquid nitrogen, and is characterized in that an air outlet pipe is arranged on the Dewar bottle to be communicated to a heater outside the outer shell, the heater is provided with an air inlet pipe which is communicated to the interior of the outer shell, and an air outlet is further formed in the outer shell. According to the saturated core type superconductive current limiter, the nitrogen discharged out from the Dewar bottle can be recycled through the additionally-arranged air outlet pipe and heated to be discharged into the outer shell for use to enable the pressure inside the outer shell to be higher than the environment pressure, and environment moisture is prevented from permeating into the outer shell; meanwhile, moisture in the outer shell is discharged out of the outer shell through the nitrogen, a dry operation environment is provided for the saturated core type superconductive current limiter, and therefore the problem that insulation resistance is reduced is solved.

Description

technical field [0001] The invention relates to a saturated iron core type superconducting current limiter, in particular to a saturated iron core type superconducting current limiter which utilizes nitrogen to enhance insulation performance. Background technique [0002] The body of the saturated iron core type superconducting current limiter is mainly composed of an iron core included in the casing, an AC winding, and a superconducting DC winding, wherein the superconducting DC winding is set in a Dewar filled with liquid nitrogen; the AC winding is a primary winding, Its voltage is grid voltage and requires good and reliable insulation. [0003] According to the different insulation medium of AC winding, the insulation structure of saturated iron core superconducting current limiter is divided into three categories: air insulation (dry type), oil-immersed insulation and gas insulation. Air insulation (dry type) relies on epoxy resin and air to insulate AC windings from o...

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Problems solved by technology

The pressure inside the shell is equal to the ambient pressure, making it easy for ambient water vapor to penetrate into the shell to form a humid operating environment, which is likely to cause a drop in insulation resistance

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