Heat Shrink Stress Control Tubes
- CCMT
- CHANGCHUN,CHINA
- Based on the order quantity
- 5 million meters per month
1. Stress control sleeves homogenize the electric field distribution at medium and high voltage cable terminations and joints, reducing the risk of partial discharge and insulation breakdown.
2. We use a heat-shrink installation method, which, when heated, tightly adheres to the cut position of the cable's outer shielding layer.
3. Stress controlled heat-shrink tubes are suitable for medium and high voltage cross-linked power cable terminations and joints, improving the operational reliability of cable accessories.
At the spot of cutting off outer cover of the medium and high voltage cable, when putting in terminals and joints, the high voltage fields concentrate at that region. The field concentration becomes dangerous and leads to partial discharge, insulation aging, and at the worst case insulation breakdown if only the stress control method cannot meet the demand. Not only that, it also causes the failure of accessories for cables, the necessity for frequent maintenance, and power outages.
We solve this problem by using heat shrinkable polymer materials with semi-conducting functional fillers. After being cut and heated, it firmly sticks to the outer shield of the cable and creates a continuous stress control layer that is stable and smooth. In so doing, it effectively reduces the localized electric field, thereby minimizing the risk of both partial discharge and insulation breakdown, while also distributing the field more evenly over the surface of the insulation.
Stress Control Sleeves:
These are heat-shrink films that can be physically reduced as needed, commonly utilized in electrical cable fittings with a high-voltage range, terminations, and insulation transition areas. They serve mainly to even out the electric field distribution, relax stress in high concentration areas, and lower the threats associated with the partial discharge and insulation breakdown phenomena. The stress controlled heat shrink tube is composed of a heat-shrinkable thermoplastic polymer containing semi-conductive functional fillers. Heating and shrinking are the steps that finally lead to the tight contact with the cable and the formation of a stable stress controlling layer. Moreover, it acts as additional insulation and as a means of mechanical protection and moisture sealing providing more secure, consistent, and longlasting service to the medium and high voltage cable systems.
Product Parameters:
Test Project | Test Methods | Technical Requirements |
Tensile Strength | ASTM D2671 | ≥8 MPa |
Ultimate Elongation | ASTM D2671 | ≥200% |
Heat Shock (200°C, 30 min) | ASTM D2671 | No cracking or dripping |
Permittivity | IEC 60250 | 15–35 |
Volume Resistivity | IEC 93 | ≥1011 Ω.cm |
Advantages of Heat Shrink Stress Control Tubes:
1. Homogenized Electric Field Distribution, Reducing Insulation Failure Risk.
Our heat shrink stress control tubes, which control dielectric constant of 15 to 35 according to IEC 60250, and a volume resistivity above 10 Ω·cm complying with IEC 93 stand as a testimony to stable electrical characteristics that will do their part in equalizing of electric field distribution at high-voltage cable joints and insulation transition zones, therefore reducing localized stress concentration and preventing the risk of partial discharge and insulation breakdown.
2. Convenient Heat Shrink Installation, Reliable Fit and Seal.
Our products display a tensile strength of at least 8 MPa and an elongation at break exceeding 200% (ASTM D2671) that means their combination of strength and flexibility is ideal. Upon heating, they contract fast and form a snug contact with the cable and joint surface and there is no need for adhesives or complicated curing processes. They have the ability to adjust themselves to varying installations and make a stable, gapless control surface that will not come apart or change shape. Additionally, when tested for 30 minutes with 200°C thermal shock, they neither crack nor drip; structural integrity and reliability of the product are maintained and that product is even installable under high-temperature conditions.
3. Combines Electrical Stress Control and Protection.
We manufacture a high-performance stress control heat shrinkable tubing which combines electrical stress control, secondary insulation and environmental sealing functions. The product, while ensuring an even electric field distribution, also offers mechanical protection and environmental protection against, for example, moisture and dust for cable joints. It thus minimizes the amount of additional materials required for cable joints.
4. Improves the Long-Term Reliability of Cable Accessories.
The product offers effective prolonging of the service life of cable terminations and splices through continuously stable electric stress control in combination with a tensile strength of at least 8 MPa or higher, a break-even point of 200 percentage, and heat resistance of undamaged state at 200℃ thermal treatment. The product allows less frequent maintenance, and its application is appropriate for medium and high voltage cables running in adverse conditions and long-lasting operation.
Applications of Stress Control Heat Shrinkable Tubing:
Heat shrink stressed control sleeves are mainly used for MV and HV cable terminations, joints, and transition sections insulation. The stress control sleeve is a kind of material that can distribute the electric field more evenly, thus helping mitigate the risk of the electric field concentration as well as the potential electrical discharges. Our heat shrink stress control products cater different sectors: substations, distribution networks, power engineering, rail transit, wind power, photovoltaic, and industrial power systems; they not only offer the cable accessories a stable stress control, supplementary insulation, and environment protection but also enhance the safety and reliability of the electric power systems in a long run.
About CCMT:
We Have Been Deeply Involved in Cable Accessory Manufacturing for Nearly Forty Years.
Since being established in the year 1986, we have devoted ourselves to research and development and manufacturing of cable accessories. Our product range includes heat-shrinkable materials, cold-shrink cable accessories, insulating material tapes, and compound potting materials for insulating purposes. As an enterprise, we have integrated R & D, manufacturing, quality control, and global logistics into our production system to supply customers in power, electric, communications, and industries sectors.
Large-Scale Manufacturing Ensures Stable Delivery.
Our enterprise has a modern production plant of over 10,000 square meters, a workforce of more than 200 experts, and about 40 production machines. We have set up 13 plastic extrusion production lines, 10 oil expansion machines and 5 air expansion production lines, which altogether form a full heat-shrinkable material manufacturing system capable of producing 5 million meters per month.
Strict Quality Management Meets International Standards.
We continuously optimize product materials and processes and have established a quality management system that complies with ISO 9001:2015 standards. Our products have obtained international certifications such as CE, SGS, and IEC, and comply with environmental regulations such as RoHS and REACH. All products undergo third-party type testing, and quality inspection is implemented throughout the entire process, from raw materials and production to finished products.
OEM and Customized Solutions Offered.
We not only produce standard articles, but we also have OEM and custom manufacturing services available. We are capable of designing and producing goods that meet the customers' specifications in terms of size, color, characteristics of the material, type of packing, and brand. We provide brand owners, distributors, and plant manufacturers with more adapt able product solutions.
Serving the Global Market.
Presently, our product export is spread out to numerous countries and regions in both the Middle East, Southeast Asian, South America, and Europe, with application areas ranging from electric supply engineering, industrial fabricating to rail transport and new energy sector. We have supplied the ultra-thick triple-layer co-extruded shrinkable composite tubing to RAYCHEM and the low-pressure shrinkable heat-shrink tubing to ABB, gaining invaluable international co-operation insights at the same time.
Continuously Expanding International Cooperation.
Having operated as a cable accessory producer with extensive industry knowledge for more than four decades, we highlighted our solid product technology and production capabilities at this year’s Hannover Messe exhibition in Germany. Besides attracting attention of potential international customers on the trade fair, we used the international exhibition platform as a tool of deepened partnerships and global outreach. As for our company, this will help to constantly promote international expansion of the brand.
FAQ:
1. How does heat shrinkable stress control tubing reduce cable fault risk?
By forming a stable stress control layer, it homogenizes the electric field distribution, reducing the risk of partial discharge and insulation breakdown.
2. Are heat shrink stress control tubes easy to install?
We use a heat-shrink installation method, which allows for rapid shrinkage and adhesion to the cable surface after heating, eliminating the need for complex construction processes.
