Connection Method Of Epoxy Resin Insulator

The joint structure refers to the structural form of the connection between high voltage standoff insulators and the core rod, which mainly includes bonding, wedge-jointing and crimping. Since the installation of the joint shield usually causes a certain degree of stress concentration on the core rod in the joint area, the joint structure is the weak link of the mechanical properties of high voltage epoxy. Improving the existing joint structure and designing a new joint with excellent performance is an effective means to improve the overall mechanical properties of epoxy resin insulator. At present, all major foreign manufacturers only use crimping joints. In 1999, Tsinghua University and high voltage epoxy resin manufacturers in my country successfully developed high voltage standoff products.

As a new joint structure, crimping joints have the practical characteristics of low cost and high efficiency. At the same time, they have unique advantages in some mechanical properties: such as better long-term and short-term static load performance, dynamic load performance, and possible improvements in end sealing. Although the crimping process has been widely used abroad, there are few publicly published documents, and there are almost no public reports on how to apply detection technology to ensure the crimping effect during the crimping process. This chapter will summarize the mechanical properties of hardware materials and different joint structures, and focus on the research of crimped joint structures.