Why Can't Pre-insulated Bushings Be Immersed In Water For Extended Periods?

pre insulated sleeve is an insulating component in the power system, which plays an important role in insulation and sealing at connection points or joints. The insulation material for pre insulated junction sleeve is typically a polymer composite material, which provides stable insulation support and mechanical protection under normal construction and operating conditions. However, when moisture continues to penetrate the interior of insulated joint sleeve, it will have a complex effect on the material itself and its electrical properties. As can be seen from the moisture behavior of cable insulation, water entering the insulation structure reduces the dielectric strength of the material, and long-term water contact accelerates the insulation degradation process, such as causing water treeing and hygroscopic deformation, leading to problems such as decreased insulation withstand voltage and distorted electric field distribution.