Fiber-reinforced epoxy resin composite insulating material electrical treeing deterioration experiment method

Abstract

The invention discloses a fiber-reinforced epoxy resin composite insulating material electrical tree degradation experiment method, which is characterized in that a needle-plate electrode system with a specific angle is prepared by designing a curing mold, and the electric field directions of internal defects of a fiber-reinforced epoxy resin composite material and fiber bundles under different included angles can be simulated; and a brand new method is provided for observing the electrical tree degradation condition of the fiber-reinforced epoxy composite material and researching an insulation failure mechanism. The method comprises the steps that firstly, fibers are placed in a designed polytetrafluoroethylene mold, the laying angle of a fiber bundle is controlled to change within the range of 0-90 degrees through an angle scale, a high-voltage needle electrode is pre-buried, and then the mold is sealed; secondly, preparing an electrical tree degradation experiment sample with a preset high-voltage needle electrode; in order to guarantee good contact between the sample and the ground electrode, a copper foil with the thickness of 100 microns is pasted to the bottom of the sample, and the copper foil is connected with the ground electrode; and finally, respectively connecting the high-voltage electrode and the ground electrode to a high-voltage power supply and a ground wire, and observing the growth condition of the internal electric tree by using a microscope.

Description

technical field [0001] The invention belongs to the field of high-voltage equipment insulation, and in particular relates to an experimental method for the deterioration of electrical branches of a fiber-reinforced epoxy resin composite insulating material. Background technique [0002] In recent years, with the further improvement of power system transmission voltage level and transmission capacity, the reliability of UHV combined electrical equipment (GIS) has been greatly challenged. The insulating tie rod is the key structural part of the ultra-high voltage GIS circuit breaker to complete the electrical on-off operation. It needs to bear certain tensile or compressive loads and instantaneous operating impulse voltage during operation. Its operation reliability is directly related to the switchgear and even Safe and stable operation of the power system. [0003] Insulation materials will experience insulation degradation during operation. As a typical form of insulation ...

AI Technical Summary

Problems solved by technology

Electric tree branch is a partial discharge phenomenon caused by local electric field concentration caused by defects such as impurities and air bubbles inside the insulating medium. It can eventually penetrate through the high-voltage electrode and the ground electrode, causing insulation breakdown and becoming a bottleneck problem restricting the safe and reliable operation of the power system.

[0004] Fiber-reinforced epoxy resin insulated rods have defects such as impurities and air bubbles during production or operation. Partial discharges will occur under the action of a strong electric field, and dendritic discharge channels will appear, which can eventually penetrate the high-voltage electrode and the ground electrode, resulting in insulation. Breakdown, causing GIS operation failure and other accidents

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