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Pollution deposition of insulators may lead to flashover, and the factors affect it should be studied to better prevent the occurrence of pollution-induced flashover. In this paper, by taking XP-70 insulator as the sample, the software FLUENT was used to simulate the airflow field distribution as well as the particle collision coefficient (P) around insulator string. At the same time, a natural contamination...
The external insulation contamination on real transmission line is mainly composed by the mixture of NaCl, CaSO4 and other various kinds of constituents. Different constituents have effects on the flashover performance of various types insulator, but it is still not considered by the existing standard about external insulation design in polluted region. This paper investigated the electrical property...
Pollution materials affect insulator flashover performance, and there is long-term significance in researching it. In this paper, common kinds of nitrates were used as the soluble pollution, and the ac flashover tests of typical glass insulator were carried out. During the tests, the samples were polluted by dipping method. Also, up-and-down method was used to obtain the insulator flashover gradients...
Yunnan is one of the largest centres of genetic ecological diversity and the richest area for elite germplasm of rice (O. sativa L.) resources in the world. Its indigenous rice average diversity index of six ecological groups are, in turn, javanica (1.2319) > aman (1.1738) > communis (1.1726) > nuda (1.1618) > aus (1.1371) > boro (0.9889), and there are great differences between indica...
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