Analysis of the reasons for the fracture of post insulators in a 220 kV transmission line
According to a 220 kV transmission line post insulator fracture case,the insulator fracture cause is comprehensively analysed through the on-site inspection combined with ultrasonic flaw dection.The results show that the adhesive part of the fractured porcelain post insulator is not up to the national standards,and the general manufacturing technology such as sandblasting and asphalt coating is not adopted,it can not buffer the stress caused by the difference of expansion coefficient of porcelain,adhesive and metal accessories.Under the long-term effect of the stress,the post insulator iron and porcelain bonding site crack.
support insulatorfracturesandblastingcoated with asphalt
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