Solid insulation treeing type high temperature test system capable of realizing high efficiency temperature control

Abstract

The invention relates to a solid insulation treeing type high temperature test system capable of realizing high efficiency temperature control. The system comprises a test vessel formed by a container wall and a glass foundation, wherein the test vessel is internally filled with dimethicone, an annular glass tube surrounds an inner side of the test vessel in a spiral mode, the annular glass tube is connected with a high temperature heating source through a heat circulation tube, the high temperature heating source is internally filled with silicone oil, a sample is arranged at the bottom portion of the test vessel, one end of a high voltage leading wire is connected with an anode of the sample, the other end of the high voltage leading wire is connected with a high voltage power source, one end of a low voltage leading wire is connected with a cathode of the sample, and the other end of the low voltage leading wire is externally in grounding connection. The treeing type test on the solid insulation sample can be carried out under the action of external AC / DC voltages, microscopic observation on electrical tree initiation and growth characteristics can be realized, voltage stress and high temperature thermal stress can be simultaneously applied to the sample, treeing type test and measurement can be prevented from being influenced by a heating system, the system employs enclosed circulation, and the system further has advantages of small heat loss, high heat energy utilization efficiency, simple operation, reliable running, no noise and long service life.

Description

technical field [0001] The invention relates to a high-temperature dendrification test system capable of high-efficiency temperature control, in particular to a test system for performing a high-temperature dendrite test on solid insulating materials under the external AC and DC voltages. Background technique [0002] The aging of insulating materials refers to the irreversible changes in the properties of materials under the long-term action of heat, electricity, mechanical force, light, oxygen, moisture, chemicals, high-energy radiation, and microorganisms during storage or use. The phenomenon. The factors that cause the aging of insulating materials mainly include the following categories: electrical stress, thermal stress, mechanical stress and environmental stress. [0003] Electrical aging is a unique aging form of high-voltage insulating materials. It is the deterioration of material properties caused by high voltage or high field strength for a long time; thermal ag...

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Problems solved by technology

But our research found that this system also has some shortcomings: 1) The experimental vessel includes an outer ring and an inner ring, and the silicone rubber pipeline is laid between the inner and outer rings. Such a structure makes the amount of silicone oil to be heated larger , the heating time is long, and the utensils are troublesome to make, waste materials, and the space utilization rate is low; 2) The inner ring is made of polytetrafluoroethylene material, which has poor thermal conductivity and hinders the effective transfer of heat. Make the temperature of the silicone oil in the inner ring meet the test requirements; 3) The system uses high-viscosity (500cps-1000cps) silicone oil, which has poor fluidity and slow heat transfer during the cycle, and it takes a long time to reach the test temperature, especially at high temperatures Heating is difficult; 4) The temperature in the high-temperature heating source and the temperature in the experimental vessel are greatly different, resulting in a narrow test temperature range that the test system can provide

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