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Experiment of composite insulator
Composite insulators and porcelain insulators because of the structure and information is not the same, its mechanical and electrical function evaluation and inspection methods and porcelain insulators there is a big difference between the experimental methods are not the same.
Therefore, the development of composite insulators earlier in some countries, such as Germany, the United States, the former Soviet Union have developed a special specification for composite insulators.
International Electrotechnical Commission IEC in Europe and the United States consider induction on the basis of the experimental method, on March 1992 formally announced the "world standard definition, test method of composite insulator and accepted principle of" communication overhead line extra voltage higher than 1000V, laid a solid foundation for the future development of composite insulator.
Now, IEC is still exploring and perfecting some experimental methods suitable for composite insulators.
The experiment of composite insulator in LEC specification is composed of four parts: planning experiment, type experiment, sampling and routine experiment. In addition to the mechanical and electrical experiments, the experiments and data experiments of composite insulators are carried out in addition to mechanical and electrical experiments. Sampling and routine experiments are basically the same as porcelain insulators.
Planning experiment is inductive function experiment of composite insulators for mechanical and electrical interface, dielectric strength, core rod and umbrella skirt material function, attachment strength of mechanical connection. The intent is to examine the reasonableness of planning, materials and manufacturing techniques.
The creepage distance and shape of umbrella skirt, skirt its hydrophobicity, mandrel quality, bonding technology of interface function, resolution of composite insulator quality. Because the composite insulator core rod and the umbrella skirt is made of organic materials, so there is an aging question, electricity, heat, mechanical and other factors will also aggravate the aging, although not rod insulator breakdown, but perhaps because of bad bonding occurs along the interface of the internal breakdown. In addition, also perhaps because of questions about the quality of mandrel and the occurrence of cracking, these are not the same place with a porcelain insulator.
For these characteristics, planning experiment of composite insulators including the experimental contents of four aspects: interface experiment, mechanical load, insulator damage experiment experiment, experimental data of mandrel coat.