Electric power is a powerful driver and solid foundation for economic and social development. A stable and reliable power supply environment is crucial for social stability. As a critical component of transmission lines, the safety of power cables is of paramount importance. According to incomplete statistics, cable faults are most commonly found at cable accessories (joints and terminals). Therefore, strengthening the inspection and preventive measures for power cables is essential to enhance the stability of the power system and ensure the smooth operation of production activities.

Common Methods for Cable Joint Repair

To ensure the long-term safe operation of cables, the following widely adopted cable joint repair methods are recommended:

Cold Shrink Method

This method utilizes elastomeric materials (such as silicone rubber, EPDM rubber, etc.) that are injection-molded and vulcanized in the factory. The electric field control, internal electrode, enhanced insulation, and insulation shielding layers are integrated into a single unit. On-site installation only requires positioning the component and allowing it to automatically shrink, making the process simple, efficient, and adaptable to various conditions.

Wrapping Method

This method involves using insulation tapes with distinct characteristics and applying them in a precise process to restore the cable’s structure and functionality. Each specialized insulation tape offers excellent electrical performance and stability in high electric fields and extreme temperatures. With superior self-adhesive and self-fusing properties, these tapes quickly form a tight bond between the tape layers and the cable itself, reducing air gaps, minimizing partial discharge risks, and preventing moisture ingress. This ensures long-term cable reliability. The wrapping method is highly flexible, easy to implement, and suitable for cable joints across different cross-sectional sizes, making it widely applicable.

Fusion Splicing Method

Based on cable structure principles, this method involves using materials and specifications identical to the original cable. The process includes conductor welding, conductor grinding, restoration of the inner semiconductor layer, restoration and polishing of the main insulation layer, outer semiconductor layer restoration, and restoration of the outer sheath. This multi-step process creates a regenerated cable connection that enhances waterproofing and insulation performance, significantly extending the cable’s service life.

Ensuring Safety Through Quality Products

Regardless of the repair method employed, selecting high-quality and stable-performance insulation tapes and related products is crucial. Only by ensuring safety and reliability can optimal construction outcomes be achieved, thereby enhancing the stable operation of the power system.