There are three main structures of high voltage cable intermediate joints: combined assembly type, wrapped type and integral prefabricated type.

Wrap-up type has been basically eliminated, the combined assembly type has been reduced year by year, and the integral prefabricated intermediate joint is the current mainstream variety. The State Grid has listed the integral prefabricated intermediate joint as the preferred structure for bidding in the past three years.

Low-viscosity high-temperature vulcanized silicone rubber is the first choice for manufacturing high-pressure intermediate joints, which can effectively eliminate the air gap between the conductive cone and the conductive tube and the insulating glue, effectively avoid the generation of defects between the conductive cone and the conductive tube, and the insulating rubber, which can improve Electrical performance of the product.