Insulator is a special insulating control which can play an important role in overhead transmission line. Early years insulator for more poles, slowly development in high type high voltage wires to hang a lot at the end of the disc insulators, it is to increase the creepage distance, usually made of glass or ceramic call insulator. Insulator in overhead transmission lines with two basic role, namely support wire and prevent the current back, these two functions must be guaranteed, insulator should not change due to environmental and electrical load conditions lead to various electrical and mechanical stress and failure, or else there won't have a significant role in the insulator, will damage the whole line of use and operating life.
The insulator has about several hundred nucleotide pairs, which is a regulatory sequence usually located between the promoter and the positive regulatory element (enhancer) or negative regulatory factor (for heterochromatin). The insulator itself has neither positive nor negative effects on gene expression, but it does not allow other regulatory elements to play a role in the activation or inactivation of genes.
The main material of the steel glass insulator of structure transmission and distribution line is iron hat, tempered glass or ceramic and steel foot, and the cement glue is used as one.
At one end of the high voltage wire connection tower hangs a number of discs of insulators, which are designed to increase the creepage distance, usually made of glass or ceramic, called insulators.
In order to prevent dust and other impurity in the adhered on the surface of the insulator, forming pathway was breakdown voltage on both ends of the insulator, namely creepage. Therefore, increasing the surface distance, namely the creepage distance, the distance along the surface of the insulating discharge the leakage distance call creepage distance. Distance = surface distance/high voltage system. According to different degree of filth, heavy polluted areas generally adopt the creepage distance is 31 mm/kv.
A zero-value insulator refers to an insulator with a potential distribution near zero or zero at both ends of the operation.
Zero or low insulator: the influence of the insulation of the line conductor depends on the insulator string, due to manufacturing defect or role of the outside world, the insulation of the insulator performance will continue to degradation, when absolutely resistance lower or equal to zero is called low or zero insulator. We have to test the circuit, and the proportion of zero or low insulator was about 9%. This is our company another main cause of the high line lightning trip-out rate. Insulators are smooth and can reduce the resistance between wires to reduce current loss.
The classified insulator can be divided into column type (pillar) insulator, suspension insulator, anti-pollution type insulator and bushing insulator.
Insulators used in overhead lines are commonly used with pin insulators, butterfly insulators, suspension insulators, porcelain crossbars, rod insulators and tension insulators.
Now the commonly used insulators are: ceramic insulators,
Glass steel insulator, composite insulator, semiconductor insulator.
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