In the selection of filler for medium and high voltage cables, the filler rope and the filler strip have their own characteristics and applicable scenarios.
1. Bending performance:
The bending performance of the filler rope is better, and the shape of the filler strip is better, but the bending performance of the finished line is poor. This makes the filler rope perform better in terms of cable softness and flexibility.
2. Water content:
The filler rope is more dense, almost will not absorb water, and the filler strip because of its large gap, easy to absorb water. Excessive water absorption will affect the shielded copper strip of the cable, resulting in redness and even oxidation.
3. Cost and production difficulty:
The cost of filler is low, and the production process is relatively simple. In contrast, the cost of filler strips is slightly higher, the production cycle is longer, and the production process is more complex.
4. Flame retardant and vertical water resistance:
The filler strip is not suitable for flame retardant cables due to its large gap, poor vertical water resistance, and is not conducive to flame retardant. The filler rope performs better in this regard, providing better flame retardancy and water resistance.
In summary, the choice of filler rope or filler strip mainly depends on the specific application needs, cost budget and production conditions and other factors.
What are the specific application scenarios of filler rope and filler strip in different cable types?
1. Filler rope:
(1) Outdoor layer armored cable: loose sleeve (and filling rope) around the non-metal center reinforcement core (phosphating steel wire) twisted synthesis of compact cable core, used for mining optical cables, pipeline optical cables, overhead optical cables, direct buried optical cables, indoor optical cables and subway pipe gallery special optical cables.
(2) RVV cable: suitable for fixed installation in indoor environment, the filling is generally made of cotton, PE rope or PVC, the main function is to enhance the mechanical strength of the cable.
(3) Flame retardant cable: the filler rope not only plays a supporting role, but also has a flame retardant function, and is widely used in various fields of the national economy.
2. Filler strip:
(1) Multi-core cable: the filler strip is used to fill the gap between the conductors and maintain the circular shape and structural stability of the cable.
(2) Cable for rail transit vehicles: After adding the center filler strip, its structure is more stable, and it is suitable for power cables and control cables.
How does the bending behavior of the filler rope affect the overall performance and service life of the cable?
The bending performance of the filler rope has a significant effect on the overall performance and service life of the cable. First, the cable will frequently experience bending, vibration and mechanical shock during operation, which can cause damage or breakage of the cable. Therefore, the bending performance of the filler rope directly affects the durability and reliability of the cable.
Specifically, the bending stiffness of the packed rope affects the stress distribution and fatigue life of the cable when subjected to external forces. For example, the design of multiple friction coefficients allows the bending stiffness of the rope strands to vary smoothly between the maximum and minimum values, thereby increasing the service life of the cable under wind loading. In addition, the braided structure of the filler rope will also affect the bending fatigue performance of the cable, and the appropriate braided structure can reduce the wear and damage of the cable during use.
The bending property of the filler rope affects the overall performance and service life of the cable by affecting the stress distribution, fatigue life and wear resistance of the cable.
How to prevent redness and oxidation caused by water absorption?
To effectively prevent redness and oxidation caused by water absorption of the filler strip, the following methods can be taken:
1. Use antioxidants: Adding antioxidants to the filling material can effectively prevent the occurrence of oxidation reactions. For example, adding antioxidants to the tin strip prevents the surface of the tin strip from reacting with oxygen to form an oxide film, thus avoiding oxidation.
2. Surface treatment: Surface treatment of the filling material, such as coating treatment, can reduce the influence of water on it, thereby reducing water absorption and the possibility of oxidation.
3. Blending modification: Through blending modification technology, the performance of the filling material can be improved, so that it has better water absorption resistance and oxidation resistance. For example, nylon products can be modified by blending, powder filler filling modification, nano powder modification and other methods to reduce water absorption.
4. Matrix modification method: Adding oxidation inhibitors inside the graphite matrix can improve the oxidation resistance of the material, especially in high temperature environment.
5. Argon arc welding technology: In the welding process, the use of argon arc welding technology can effectively avoid the occurrence of color blackening and oxidation. Specific methods include controlling welding parameters and using appropriate protective gases.
What are the comparative studies on the cost-benefit ratio between filler rope and filler strip?
1. Cost reduction: Generally speaking, fillers are cheaper than resins, so adding fillers can greatly reduce the cost of plastics and has obvious economic benefits. This means that when using filler ropes and filler strips, if they can effectively replace resin, the overall cost will be lower.
2. Improved heat resistance: Although the heat resistance of the filler rope and filler strip is not directly mentioned in the evidence, plastic filler modification usually improves its heat resistance. This shows that when selecting filling materials, in addition to considering cost effectiveness, it is also necessary to consider its impact on product performance.
3. Comprehensive performance improvement: By adding fillers, it can not only reduce costs, but also improve other properties of plastics, such as heat resistance. This is particularly important for the application of filler ropes and filler strips, as they need to have good physical and chemical properties to meet different use needs.
The comparative study of the cost-benefit ratio between the filler rope and the filler strip should focus on the following aspects: cost reduction, heat resistance improvement and overall performance improvement.
In the field of flame retardant cables, how is the performance difference between the filler rope and the filler strip reflected?
1. Density and weight:
The filler rope usually has a lower density, which helps reduce the overall weight and manufacturing cost of the cable. In contrast, the specific density of the filler was not explicitly mentioned in the information I searched, but it can be inferred that the density may be similar to that of the filler rope.
2. Strength and breaking force:
The strength of the filled rope is high, such as the strength of low-smoke halogen-free flame retardant PP rope can reach 2g/d (such as the strength of 3mm ≥60kg). This high strength characteristic makes the filler rope perform well in the cable formation effect, and can provide better support and protection.
3. Flame retardant performance:
The flame retardancy of the filler strip is very good, with an oxygen index of more than 30, which means that they release less heat when burning and burn more slowly. Although the filler rope also has good flame retardant performance, the specific oxygen index value is not explicitly mentioned in the data I searched.
4. Material processing and application:
The filler rope can be made of polypropylene resin and flame retardant masterbatch as the main raw materials, and the mesh tear film can be made by extrusion forming process. This processing method makes the filler rope more convenient in the production process, and does not need to add other raw materials, and the quality is stable. Filler strips can be processed into different materials according to customer needs, such as polyvinyl chloride.
5. Environmental protection and recycling:
Because of its halogen-free flame retardant properties, the filler rope meets the environmental requirements of ROHS, and has good aging resistance and recyclability. The filler strip also has environmental protection characteristics, but the specific environmental standards and recycling capacity are not detailed in the information I searched.
Filler rope and filler strip have their own advantages in the field of flame retardant cables. The filler rope is known for its high strength, low cost and good cabling effect, while the filler strip is outstanding for its high oxygen index and excellent flame retardant properties.
Post time: Sep-25-2024