Study On The Compositions Of Electric Porcelain And Glass Used For The Direct Current Insulators

The power transmission technology has been promoted rapidly by the development of the power industry. With the development of AC transmission to extra high voltage and ultra high voltage, high voltage direct current (HVDC) transmission technology has been payed much attention due to its obvious advantages. Traditional insulators contain a certain amount of Na2O, that is some Na~+can be found in these materials. Under the long-term effect in direct current electric field, Na~+gradually migrate to the cathode, which is not reversible that lead to the aging of insulator materials. Therefore, increasing the volume resistivity and controlling Na~+ migration have become an important research subject in the development of DC insulator products.According to the structural characteristics of the company, electric conductivity and its failure mechanism of the DC insulator were investigated, effects of chemical composition on the volume resistivity of the insulator were also analyzed. By optimizing the processing parameters and the compositions of the DC electric porcelain and glass, a valid controlling technique can be found to improve the volume resistivity, which made them to meet the manufacturing requirements of the DC insulator.