Rod insulator also known as: composite insulator or suspension insulator also known as non-porcelain insulator abroad is a polymer insulator consisting of at least two insulating components, a core and a coat with metal attachments. (a polymer is a substance consisting of a molecule whose structure is characterized by repeated repetitions of one or more interconnected atoms or groups of atoms, and whose molecular weight is large enough that the overall performance does not change significantly with the addition or removal of one or more structural units.) A composite insulator is an insulator consisting of at least one polymer base material.
Detection of composite insulator
At present, the commonly used method for external physical defects of composite insulator is direct observation method, which USES binoculars to observe under the tower to find out whether common surface defects such as jacket, umbrella skirt, metal tools and other parts have cracks, and whether there are electric erosion damage, pulverization, leakage traces, etc. If the above phenomena occur, the insulator should be replaced immediately. However, the ground observation is not reliable enough, and it is also necessary to ascend the tower detection and difficult to detect the internal insulation failure such as dendritic channels.
Small but stable surface partial discharge can lead to carbonized channels or electrical erosion of the composite insulator umbrella skirt and sheath. When a carbonized channel is formed on the surface of the insulator, its service life can be greatly reduced or even broken down in a short time. The electron ultraviolet photodetector can be used to detect the carbonation channel and electric erosion loss on the surface of the composite insulator due to partial discharge. The principle is: the charged particle compound will emit ultraviolet light in the process of partial discharge. When the conductive carbon channel is formed on the surface of the insulator, the partial discharge intensifies. The disadvantage of this method is that it is required to operate at night and under positive temperature. In addition, partial discharge is required at the time of detection, which should be carried out in the environment with high humidity and even rainfall. However, the test results are easily affected by the observation Angle, and the test equipment is more expensive.
The infrared imaging method can detect the local temperature rise of insulator caused by dielectric loss or resistance loss when partial discharge or leakage current flows through the insulating material, and can be used for online detection.
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