When composite insulators are used in DC systems, how to choose the right creepage distance becomes a big problem. This aspect is due to the fact that there is too little research on the anti-fouling performance of composite insulators under DC resistance at home and abroad; on the other hand, due to the little experience of DC composite insulators, the fouling laws under various pollutions are not enough. Clearly, there is too little data available for reference; the third aspect of the problem is that even under the same contamination, there is a significant difference in the flashover voltage of porcelain insulators under positive and negative polarity, that is, there is a so-called polarity effect, and because of the polarity The effect of the effect, the same shape, creeping porcelain insulators under the same pollution degree DC flashover voltage is lower than the effective value of the AC pollution flash voltage, that is, the orthogonal ratio is less than 1.0. Therefore, when the composite insulator is used in the DC system, the selection of the creepage distance needs to be paid special attention. There should be no frequent tripping caused by the selection of the creepage distance according to the AC pollution flashing characteristics, and there is no need to blindly increase the creepage distance excessively. Conducive to the self-cleaning of the insulator, it is also easy to cause bridging between the sheds, which may have little effect on improving the flashover and wet flash voltage, and even counterproductive.
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