A method for suppressing and evaluating the overheating of cable terminal insulation surface
A technology of cable terminals and insulating surfaces, which is applied in the field of cable terminal fault evaluation, can solve the problems of lack of preventive measures and countermeasures, terminal explosion, poor laying environment, etc., and achieve the effect of avoiding terminal explosion problems
Active Publication Date: 2020-04-24
新疆北方交联线缆有限公司
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Problems solved by technology
After statistical analysis, due to the concentrated electric field, uneven heat dissipation or poor laying environment, the cable terminal part is prone to overheating of the terminal insulation surface, which greatly increases the risk of cable insulation breakdown or terminal explosion.
However, there is still a lack of effective preventive measures and solutions for such problems
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[0035] The present invention will be further described below in conjunction with the accompanying drawings.
[0036] figure 1 It is a schematic structural diagram of the evaluation platform for overheating of the cable terminal insulation surface used in the present invention, which is used to suppress and evaluate the overheating of the cable terminal insulation surface. Its structure and connection method are as follows:
[0037]The cable terminal insulation surface overheating evaluation platform consists of copper-plated steel isolation shell 2, lower side halogen-free flame-retardant filling rope layer 4, upper side halogen-free flame-retardant filling rope layer 10, lower side stainless steel liner layer 16, upper side stainless steel liner Layer 23, first semiconductor cooling sheet 5, second semiconductor cooling sheet 6, third semiconductor cooling sheet 7, fourth semiconductor cooling sheet 8, fifth semiconductor cooling sheet 9, sixth semiconductor cooling sheet 25,...
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Abstract
The invention discloses a method for suppressing and evaluating the overheating of the insulating surface of a cable terminal. The suppression method includes steps of measuring the surface temperature of each area of the cable terminal, estimating the internal wire core temperature of the cable terminal, and performing suppression by using a cooling sheet. The evaluation method comprises steps ofperforming comprehensive analysis by acquiring partial discharge information and surface temperature information so as to determine the insulation state of the terminal. The method has the beneficialeffects of effectively and conveniently suppressing and evaluating the overheating phenomenon of the insulating surface of the cable terminal for a urban distribution network, avoiding terminal explosion caused by excessive heat concentration in the cable terminal, and achieving the reliable operation of the cable terminal.
Description
technical field [0001] The invention relates to the field of cable terminal fault evaluation, in particular to a method for suppressing and evaluating the overheating of the cable terminal insulation surface. Background technique [0002] In the distribution network, especially in the urban 10kV distribution network, the application of power cables has become more and more extensive, and plays an irreplaceable role in urban power supply. Compared with overhead lines, power cables have incomparable advantages in terms of power supply reliability, environmental interference resistance and service life. Most of the power cables are laid underground and do not occupy the above-ground space, which can save land resources in the city and avoid problems such as excessive and complicated overhead lines that affect the appearance of the city. Therefore, laying power cables in cities, or transforming overhead lines into cable lines, is the main trend of development. How to ensure th...
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IPC IPC(8): G01R31/08G01R31/12G01N25/20
Inventor 周利军白龙雷邢立勐曹伟东李丽妮车雨轩郭蕾
Owner 新疆北方交联线缆有限公司