Real-time microscopic observation test system for electrical tree characteristics in solid insulation under DC voltage

Abstract

The invention relates to a real-time microscopic observation test system for electrical tree characteristics in solid insulation under DC voltage, which comprises an open container, a supporting base is placed in the open container, a tested sample is placed on the supporting base, a pin electrode of the sample is connected with a high-voltage lead through a high-voltage copper cylinder, a plate electrode of the sample is connected with a low-voltage lead through a low-voltage copper rod, the low-voltage copper rod, a spring and the high-voltage copper cylinder are matched in design so as to be conducive to placement and position fixing of the sample, the open container is covered by a container cover, sloshing of silicon oil in an area above the sample can be effectively weakened through a microscopic observation column inserted at a hole in the container cover, and a direct observation window on the container cover is used for carrying out position observation and adjustment on the microscopic observation column. The real-time microscopic observation test system can fix the position of the tested sample effectively, is convenient for placing and taking the sample, can be applied to solid insulation electrical tree test samples with different shapes and sizes, can carry out real-time observation and photographic recording on a pinpoint area of the sample while applying the DC voltage, and does not need to cut off the power.

Description

technical field [0001] The invention relates to a microscopic observation test system for the characteristics of electric dendrites, in particular to a test system for real-time microscopic observation of the initiation and growth characteristics of electric dendrites in solid insulation under an external DC voltage. Background technique [0002] Due to the advantages of compact structure, convenient installation, easy maintenance, and environmental friendliness, solid insulated power equipment has been widely used in AC and DC transmission and distribution networks, and has replaced oil-paper and gas-insulated structures in many occasions. [0003] The study found that for high-voltage / ultra-high-voltage solid insulation, electrical dendration is the main cause of insulation failure. The research on the characteristics of electrical dendrites of solid insulating materials under AC voltage is extensive, mainly involving the influence of temperature, voltage amplitude, boost ...

AI Technical Summary

Problems solved by technology

[0007] When testing under AC voltage, the system can realize real-time observation and continuous recording of the sample; however, under DC voltage, the electrophoretic effect is extremely significant, silicone oil molecules move along the direction of the electric field and collide with the container wall, resulting in violent shaking of the liquid surface , it is impossible to observe the sample in real time or take a clear picture; in order to solve this problem, the method of applying voltage periodically and intermittently in the DC tree branch test is adopted. After the applicat...

Images