Low-temperature polymer electrical tree initiation method under electromagnetic field combined effect and low-temperature polymer electrical tree initiation device thereof

Abstract

The invention relates to the technology of superconducting magnet insulation reliability, aims at realizing the electrical tree observation and image acquisition functions of a simulation superconducting magnet system in a strong magnetic field environment and a low temperature environment, and provides a low-temperature polymer electrical tree initiation method under the electromagnetic field combined effect and a low-temperature polymer electrical tree initiation device thereof. The low-temperature polymer electrical tree initiation device comprises a digital microscope imaging system, a temperature control system, a constant temperature box, a controllable high-voltage pulse power supply and a magnetic field generation device. The temperature control system controls temperature of the constant temperature box through a liquid nitrogen cooling device. The magnetic field generation device is composed of a constant current electromagnetic field generator and an electromagnet. The electromagnet uses a single-yoke U-shaped structure. The polymer is a polymer sampling for performing electrical tree aging. The polymer is arranged in the middle position of the single-yoke U-shaped structure, and the two ends are connected with the controllable high-voltage pulse power supply arranged outside the constant temperature box through a pin-plate electrode structure. The digital microscope imaging system observes the growing situation of the electrical tree in an epoxy resin sample in real time. The low-temperature polymer electrical tree initiation method under the electromagnetic field combined effect and the low-temperature polymer electrical tree initiation device thereof are mainly applied to the occasion of superconducting magnet insulation.

Description

technical field [0001] The invention relates to superconducting magnet insulation reliability technology, in particular, relates to a low-temperature polymer electric dendrite induction device under the combined action of electromagnetic fields. Background technique [0002] At present, the international thermonuclear fusion project has attracted widespread attention. The leading concept of magnetic confinement high-temperature plasma has been proposed internationally for this project. The magnetic confinement fusion devices worldwide are concentrated in the Tokamak (EAST) annular Magnetic restraint up. The low-temperature superconducting magnet system is an important component unit in the Tokamak device. The composite insulators with epoxy resin as the matrix respectively constitute the insulation parts of the inter-turn insulation, interlayer insulation and magnet-ground insulation (ground insulation) in the superconducting magnet system. . Epoxy glue plays the role of c...

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Problems solved by technology

At present, there are few studies on the growth of polymer electric dendrites in a magnetic field environment, and a complete set of experimental systems and methods have not been established to observe the influence of electromagnetic field interaction on the growth characteristics of electric dendrites. The electrical tree test device to improve the relevant theoretical system

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