Test apparatus for measuring the influence of air pressure on the growing property of electrical trees on XLPE cables
A technology of cross-linked polyethylene and growth characteristics, applied in the direction of testing dielectric strength, etc., can solve problems such as explosion of cable joints, breakage of macromolecular chains, and cracking of insulating layers
Active Publication Date: 2015-11-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
Long-term high-temperature operation will lead to thermal oxygen aging of XLPE, breakage of macromolecular chains, generation of H2, CO, CO2 and other gases, and local high pressure in the cable, resulting in operational failures such as cracking of the insulation layer and explosion of cable joints. Power cables put into operation in altitude areas have been in a low-pressure environment for a long time, and the impact of reduced pressure on the growth characteristics of cable electrical branches has not yet been elucidated.
At present, there are few studies on the influence mechanism of the gas pressure inside the cable on the growth of electric trees, and there is no complete test system and method to observe the law of air pressure on the initiation and growth of electric trees and the measurement of partial discharge. Therefore, it is urgent to develop a Experimental device for measuring the effect of air pressure on the growth characteristics of XLPE electric dendrite induction
Method used
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Embodiment 1
[0022] Measuring air pressure of the present invention affects the test device of cross-linked polyethylene electric dendrite growth characteristics, such as figure 1 As shown, it includes an air pressure control system, a plexiglass tank container, a needle-plate electrode system placed in the container, a connection device between the needle-plate electrode system and the container, a microscope observation system, and a temperature control system: CO2 gas cylinder 1, electronic inlet Air valve 2, air pressure gauge 3, intake hose 4, transparent tank-shaped container (5, scale 6, glass syringe 7, bracket 8, hollow stainless steel needle 9, orange-yellow iodine tungsten (10), plate electrodes 1, 1 No. threaded rod 12, threaded flange 13, tee joint 14, air pump 15, high voltage lead 16, sealing washer 17, sleeve 18, No. 2 threaded screw 19, dimethyl silicone oil 20, digital microscope camera 21, XLPE cutting block 22, temperature sensor 23, heating rod 24, computer test system...
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The invention discloses a test apparatus for measuring the influence of air pressure to the growing property of electrical trees on XLPE cables. The test apparatus comprises a transparent jar-shaped container, a support device for an XLPE specimen placed in the jar-shaped container, a needle-plate electrode system, a temperature controlling system and a detecting system. The electrode needle of the needle-plate electrode system is a hollow stainless steel needle (9); the hollow stainless steel needle is connected to an air pressure controlling system. The air pressure controlling system transmits testing air into a cable to form partially high pressure. The transparent jar-shaped container is provided with an airtight structure. The test apparatus provided by the invention is capable of simulating the pressure change and the operating environment temperature inside an XLPE cable when the cable is in practical use. By imposing varied air pressure to the electric tree channels from a needle tip, a user can monitor the generation of XLPE electric trees and the influence on the growth of the XLPE electric trees by air pressure in real time.
Description
technical field [0001] The invention relates to experimental equipment for electrical insulating materials, especially a test device for measuring the influence of air pressure on the growth characteristics of cross-linked polyethylene electrical branches, which is used to study the relationship between the internal air pressure generated during actual operation of cross-linked polyethylene cables and the growth characteristics of electrical branches of the insulating layer. relationship between. Background technique [0002] In the transmission of urban power, cross-linked polyethylene (XLPE) power cables are widely used because of a series of advantages such as good electrical properties and mechanical properties. Due to the limitations of the manufacturing process, the insulation layer of XLPE cables will inevitably have defects such as air gaps and impurities. In addition, the long-term operating environment of cables buried underground is complex, and many factors such ...
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Inventor 周利军成睿仇祺沛
Owner SOUTHWEST JIAOTONG UNIV