The polymer insulators can be divided into electrical load and electrical performance, mechanical load and mechanical properties, thermal load and thermal performance requirements, environmental factors and various loads on the joint effect of the requirements in all four kinds of insulators. According to the voltage types of AC and DC insulators the breakdown possibility points can breakdown insulator and not breakdown insulator. Orcelain and glass insulators for anti aging performance for polymer insulator, the aging rate of the general requirements in 1/10000 following; fouling resistance than the composite insulator, it needs each cleaning time, workload is big; the weight ratio of composite insulator in many; reliability ratio of composite insulator.
The process of insulator
In our case, AC high voltage is 110000 volts and 220000 volts power grid; super high voltage power system refers to a 330000 volt, 500000 volts and 750000 volts of power grid. Ultra high voltage power grid refers to the 1000000 volt power system; HVDC means ± 500000 kV and below DC system, UHV DC to ± 800000 volt DC system. In order to reduce the transmission process of the electric energy loss, must adopt high voltage power transmission technology. The power transmission distance, transmission capacity is bigger, need the higher transmission voltage.
Post insulator
Porcelain and glass insulators, porcelain insulator has no detection problem. Zero detection is still a problem. Glass insulator will be exploded from two respects looks and the low suicide rate is advantageous because from a distance without the tower can be found. But suicide rate is also definitely impossible, and at least it hurts farmer foot. General requirements of post insulator in the lines on the service life are more than thirty years. Ultra high voltage (EHV) usually refers to the 330000 kV and above, the voltage below 1000000 volts. Ultra high voltage (UHV) is defined as 1000000 volts and over voltage. High voltage direct current (HVDC) usually refers to ± 600000 kV and below a DC transmission voltage, ± 600000 volts or more voltage called the ultra high voltage direct current (UHVDC). Good quality can meet the requirement of insulator. Composite insulator on line of life also needs data collection. Insulator in transmission line number, which belongs to the weak link, the most inexpensive, about the cost of circuit 2%, is the most important link in transmission line. Use current input maximum mechanical load strength grade is grade 550kN insulator. With strength grade of 840kN preparation successful products report.
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