Common Issues and Solutions in the Construction of Heat-Shrinkable Bus Bar Protection Sleeves

In the insulation protection of substations, the use of heat-shrinkable bus bar protection sleeves often encounters the following issues:

1. Cracking: This is the most common problem, which mainly arises due to several reasons: the cut of the sleeve is not smooth, there are burrs on the copper or aluminum bus bar, uneven baking leading to severe local heating. These issues can be resolved during construction. Additionally, there may be quality issues with the bus bar itself, such as excessive radiation dosage, low tensile strength of the sleeve, and defects like small pinholes on the sleeve surface.

2. Bubble Formation: In many cases, after shrinking, it is found that the bus bar sleeve does not fit tightly against the copper bus bar, resulting in bubbles in some areas. The main causes include: a. Failure to shrink from one end to the other or from the middle towards both ends as required by the operating instructions, which helps to expel air. b. Not preheating the copper bus bar and directly shrinking the sleeve onto it. c. Insufficient radiation dosage leading to material decomposition.

3. Wrinkles at Large Bends After Shrinking: The solution is to first shrink the straight sections, then bake from the outside of the bend towards the inside, while simultaneously one person applies slight tension to the bus bar from the other end to resolve the wrinkling issue.