Silicone Overhead Line Insulation Sleeves
- CCMT
- CHANGCHUN,CHINA
- Based on the order quantity
- 50,000 meters per month
1. Insulation covers for overhead power lines offer great electrical insulation for substation leads and jumpers.
2. The shell is composed of flame-retardant, tracking-resistant silicone rubber providing exceptional insulation as well as flame retardant characteristics.
3. Safety covers for overhead power lines have a high-performance silicone rubber spiral design permitting wrapping around existing overhead cables easily without dismantling the line or breaking the power continuity.
Overhead transmission lines are exposed to complex environments such as ultraviolet radiation, rain, snow, high temperatures, salt spray, and pollution for a long time. Traditional rigid insulation sheaths are cumbersome to install and cannot adapt to the thermal expansion and contraction of conductors and vibration displacement. They are prone to cracking, loosening, or protection failure, and may also bring risks of electric shock, short circuit, and line faults.
Our overhead line insulation covers have been made with high-performance materials and spiral structure design, which enables an uninterrupted and secure shielding layer over the conductors against the elements.
We developed a solution where the product's electrical insulation and resistance properties such as weather resistance, UV resistance, mechanical protections are combined to not only allow for the changes in conductor's position but also minimize the likelihood of contact, thus greatly improving the lines' capability of environmental protection, while at the same time it's been proved that our product can significantly prolong the service life of overhead lines.
Performance Metrics for Overhead Power Line Safety Covers:
| Test Item | Test Standard | Test Data |
| Tensile strength | IEC 60243 | 5.3Mpa |
| Ultimate Elongation | IEC 60811 | 220% |
| Shore Hardness Ha | ISO868:2003 | A/15:61 |
| Tenasity at low temperature | ～40℃,4h | No Cracking |
| Heat Shock | 90℃,1h | No Cracking |
| Volume Resistance | 6×10⁴Ω.cm | |
| Dielectric Strength | IEC 60243 | 20.7kV/mm |
| Dielectric Constant | IEC 62631 | 483.00% |
| Flamability(Oxygen index) | 0.367 |
The Specific Parameters for Different Models Are as Follows:
| Part No. | Voltage | Max.Dia.of Conductor D (mm) | Min.Dia.of Conductor D (mm) | Max Thickness T (mm) | Cross Section mm2 | Length(m/roll) |
| CCI-25-5 | upto 25kV | 5 | 2 | 2.8-3.3 | 10-50 | 20 |
| CCI-15-10 | upto 15kV | 16 | 9 | 2.5-3.0 | 50-150 | 20 |
| CCI-25-10 | upto 25kV | 16 | 9 | 3.0-3.5 | 50-150 | 20 |
| CCI-15-15 | upto 15kV | 25 | 16 | 2.5-3.0 | 185-400 | 20 |
| CCI-25-15 | upto 25kV | 25 | 16 | 3.0-3.5 | 185-400 | 20 |
Product Advantages:
1. Electrical Insulation Performance, Meeting Protection Requirements for Overhead Power Lines Up to 25kV.
Medium and low voltage overhead power line covers are used as an insulation method for power distribution systems up to 25 kV. These products are made of silicone rubber which is highly insulating and has a dielectric strength of 20.7 kV/mm (according to IEC 60243). They help ensure the insulation of the conductors from contact by external elements and also prevent the occurrence of electrical accidents through accidental touching, short circuits, or the contacting of two conductors with differing loads.
Depending on the conductor type, the insulating jacket is suitable for conductors having cross-sectional areas from 10 to 400 mm², and diameters of the conductor from 2 to 25 mm. By doing so, it creates a continuous and compact insulation layer. Through this, the jacket protects substation leads, jumpers, and distribution lines against electrical insulation failures in a stable and reliable way.
2. Spiral Structure Design for Quick Installation and Long-Term Reliable Fit.
Different from the old methods that required insulation sheaths to be rigid and integral in the design, we have the benefit of not having to remove the line with our novel design or use a complex set of installation tools at all. The installation only needs one to turn or rotate the winding around the line conductor so that the work on location will take lesser time.
The sheath is made up of silicone rubber material which is very flexible. Because of that it can stretch and shrink without resistance freely along with the conductor even under the influence of wind forces, vibration, and thermal expansion and contraction. Thus, it avoids cracking or detachment and ensures stable protection for a long period.
3. Excellent Weather Resistance and Flame Retardant Properties, Suitable for Complex Outdoor Environments.
The protection covers for overhead power lines are made from flame-retardant, anti-tracking silicone rubber material that has outstanding resistance to ultraviolet radiation, ozone, and high and low temperatures, and also to various atmospheric environmental conditions such as rain, and snow.
The sheath is made of a material whose tensile strength is measured at 5.3 MPa. It has an elongation at break of 220%; it was continuously tested for 4 hours in low temperature of -40℃, and no cracking was observed. Similarly, no cracking was observed in thermal shock testing of 90℃. Due to such properties, the material can resist aging from ultraviolet radiation, rain erosion, cover under snow as well as environmental pollution for long time keeping excellent mechanical and electrical insulation under outdoor harsh conditions and thereby significantly prolonging the life-span of the line.
4. Comprehensive Line Protection, Reducing Power Outage and Maintenance Costs.
Bare wire protection covers provide insulation protection while also reducing the impact of the external environment on overhead lines. Its continuous sheathing structure effectively prevents:
·Short circuit faults caused by birds nesting or animals climbing;
·Instantaneous tripping caused by tree branches contacting the conductor;
·Insulation aging caused by ultraviolet radiation, rain, freezing, and urban pollutants;
·Line damage caused by industrial dust, chemical media, and mechanical friction.
Product Application Scenarios:
Owing to the properties discussed above, our open cable guard is one of the products widely adopted in electric power plants or stations, transmission lines of high voltage electricity, urban electricity distribution systems, residential areas, industrial parks, and the mining sector. Among other benefits, this product helps in the prevention of electrical failures, reduction of the number of power outages, it significantly brings down line maintenance and replacement related expenses, and at the same time enhances the performance and reliability of the entire power distribution system.
About CCMT:
You can say we're a manufacturing enterprise that combines scientific research, development and marketing. We first went into business in 1986, and over the years have acquired more than 40 years of industry experience. Now, we're manufacturing factory that runs the entire 10,000 square metres, employs more than 200 people and has 40 professional production lines that allow mass production of cable accessories at different times according to the order types required!
Certification Standards:
We fully comply with the ISO 9001:2015 (No. 00123Q36311R5M/2200) quality management system. Our products have the CE certification and have been type-approved by an external international cable heat and cold shrinkage termination testing laboratory. Moreover, we are fully aware and compliant with such global environmental regulations as RoHS and REACH. In order to guarantee product safety, every item from our company is tested for visual appearance, count, and performance by the quality control department. Product inspection certificates are included along with each product ensuring 100% conformity of standards.
Delivery Guarantee:
We carry out several types of transportation services such Full Container Load (FCL), Less Container Load (LCL), FOB, CIF, airfreight, seafreight and landfreight. Our large-scale capabilities are a big plus to us, we make sure that the goods are delivered on time. On production monthly capability we reach millions to tens of thousands of meters; actual production output depends upon the product type, kindly get in touch with us for more information on the details.
Pre-Sales Service:
We are always at our best to meet the customer at any time, offering detailed descriptions of products, pictures, videos, and other relevant information to help customers make their choices. Also, we can tailor the specifications per customer demands. Post-sales service - we will deliver the goods to the customer's designated port in China and will offer excellent service.
Export Cooperation:
We have been exporting a lot of cable accessories into the Middle East, Southeast Asia, and South America regions, a total of dozens of counties, such as Saudi Arabia, UAE, Iran, India, Thailand, Brazil, and Argentina; we have also made the export of our tape products to the EU countries as well as regions.
Exhibition Activities:
We were part of the Dubai Power 2024 Show where our series of cable accessories, covering up to 220kV, was demonstrated to a large number of customer inquiries mainly from the Middle East countries.
We used the display of international certifications and full-chain quality control capabilities to show our comprehensive strength in being a highly reliable provider of solutions for global power transmission and distribution as wells as new energy sectors.
FAQ:
1. Can silicone cable protective covers be installed while the circuit is energized?
Yes.
2. After long-term use, will the silicone cable protective cover loosen due to thermal expansion and contraction of the cable or strong wind vibration?
No. The silicone rubber material is very stretchy, so it can expand, compress, and bend in the same way as the cable. In addition, the coil design has clamping power, which works well to counter wind vibration and changes in temperature, cracking and shifting are prevented, and therefore, long-lasting and secure connection is achieved.
