Future prospects for the development of synthetic insulators

    Composite insulators have a more widely used in China, the need to break awareness and more for pollution flashover, in order to shake the traditional porcelain, glass insulators dominance. To achieve this goal, the need to focus on the following issues, and to continue further research.

    1 selection ratio distance

    Synthetic insulators than selecting from the home and abroad have two kinds of comments: First, consider the hydrophobic surface material deterioration, taking 1:1; the second is a comprehensive operating experience currently States, than from the appropriate reduction, such as synthetic insulators desirable Insulators 2/3 or 3/4. In order to regulate synthetic insulators dimensions, JB / T8460 industry standards and national dispatch center "synthetic insulators using guidance" Uniform Requirements: Level 0-Ⅱ polluted areas, compared distance of 20 mm / kV; Ⅲ-Ⅳ level contamination areas, than the distance of 25 mm / kV. In fact, this provision, for clean area and general dirty areas, higher than the requirements of GB / T16434; for heavy polluted area, is 3/4 of porcelain insulators.

    Select 2 mechanical strength

    Synthetic insulators mandrel most prominent features are high strength and high specific strength. The tensile strength of up to 7 000 MPa, than five times the strength of high-quality carbon steel. In some areas, the department proposes to use synthetic insulators, mechanical strength than conventional porcelain and glass insulators improve level, such as the use of porcelain insulators to 160 kN, and the use of synthetic insulators to 210 kN. In fact, when the load is less than 40% of rated mechanical load, it can guarantee the reliability of operation [3]. Therefore, fully in accordance with the choice of synthetic insulators porcelain insulators method, without increasing the mechanical allowable load value. Mandrel load deflection measurements show that synthetic insulator has good bending properties, good resistance to vibration performance of dance and the breeze [4]. When used for strain tower, it can withstand a certain bending moments. Different ends of the connection structure of the product in the long run, the changes in mechanical properties will be different, needs further study.

    3 cleaning problem

    Composite Insulator contamination is more important than porcelain insulators, there is no consensus. Some pollution flashover accidents and heavy polluted area of composite insulator contamination too, raised the question whether cleaning is required. Because synthetic insulator flashover voltage is high, even if the hydrophobic fall short even close to disappearing, its pressure is also higher than porcelain insulators pollution by 20%. Therefore, clean area and general cleaning polluted areas are exempt. For particularly serious industrial pollution and salinity regions can be replaced periodically way around according to their own experience, when the surface hydrophobicity decreased, and the salt density is too large (such as greater than 0.2 mg / cm2) when replacing the new insulators, and in order to determine the replacement cycle.