As the core carrier of power transmission in substations across urban power supply, mining, chemical, and other sectors, 10KV-35KV busbars are directly pivotal to the reliability of power grids. Busbar heat shrink tubing, leveraging its outstanding insulation and protection performance, has emerged as a key component in the comprehensive protection of power systems, erecting an all-round safety barrier for high-voltage busbars.

This type of heat shrink tubing is manufactured from environmentally friendly polyolefin materials through electron beam cross-linking, integrating high-strength insulation with excellent processability. Boasting a breakdown strength of 20-25KV/mm and a volume resistivity of no less than 1.0×10¹³Ω・cm, it effectively eliminates common faults such as short circuits caused by small animals and foreign object touch,while preventing pollution flashover, condensation flashover, and salt spray corrosion. In extreme environments, the product can withstand a wide temperature range from -55℃ to 125℃ and maintains stable performance after a 158℃ thermal aging test, making it suitable for various indoor and outdoor scenarios.

In terms of installation and application, the heat shrink tubing offers distinct advantages: with a shrinkage ratio of 2:1 to 2.5:1, it can closely adhere to copper and aluminum busbars by heating with a heat gun. While not affecting current-carrying capacity, it reduces phase spacing, saving space for switchgear design. Its flame-retardant and halogen-free properties comply with RoHS standards, releasing no toxic gases during combustion and enhancing equipment safety levels. For the 10KV grade, the product can withstand 42KV power frequency withstand voltage and 75KV lightning impulse; the 35KV grade can endure 95KV power frequency withstand voltage and 185KV lightning impulse, meeting stringent standards such as GB311.

From a practical application perspective, the product has been implemented in numerous substations with remarkable results. Taking a 35KV suburban substation in Henan Province as an example, the substation previously suffered frequent condensation flashover and discharge phenomena in switchgear due to high temperature and humidity in summer, with an average of 6 busbar-related faults per year and unplanned downtime exceeding 30 hours cumulatively. During the 2024 renovation, over 1,200 meters of busbars and joint parts across the entire station were fully equipped with 35KV-grade busbar heat shrink tubing. Through a dual protection scheme of semi-conductive tape wrapping + heat shrink tubing sealing, the hidden danger of tip discharge was completely eliminated. Since the renovation, no insulation failure faults have occurred, the equipment failure rate has dropped by 100%, the maintenance cycle has been extended from the original 3 months to more than 1 year, and the annual operation and maintenance cost has been reduced by over 80,000 RMB.

Another typical case is the renovation project of an aging 220KV substation in Fujian Province. Due to its long service life, the substation faced issues such as insufficient phase spacing and high pollution flashover risk. After fully wrapping the busbars with 10KV-35KV series heat shrink tubing, the safe phase spacing of the busbars was reduced from 125mm to 65mm, saving 40% of switchgear space. Additionally, it successfully withstood the challenges of coastal salt spray corrosion and high humidity during the plum rain season. Data shows that after the renovation, the pollution flashover trip rate of the substation decreased from 0.8 times per year to 0, and the thermal aging life of the equipment was extended to over 20 years, fully verifying the long-term reliability of the heat shrink tubing under complex working conditions.

Furthermore, data from State Grid pilot projects indicates that substations fully applying this type of heat shrink tubing have achieved an average 32% reduction in busbar-related failure rates and a 27% improvement in operation and maintenance efficiency. Its simple construction process also provides strong support for project quality and efficiency improvement. For instance, Henan Jiyuan Power Supply Company shortened the installation time of 35KV busbar heat shrink tubing for a single main transformer from 30 minutes to 2 minutes through standardized installation processes, significantly minimizing the impact of power outages on users.

In summary, 10KV-35KV busbar heat shrink tubing, with its multiple values demonstrated in practical applications-including fault prevention and control, cost savings, and efficiency improvement-has become the core insulation protection solution for new substation construction and old substation renovation, providing solid guarantees for the safe and stable operation of power systems.