Power cables are cables used to transmit or distribute high-power electrical energy in power systems. With the great development of the petrochemical industry worldwide, medium and low voltage extruded insulated power cables have become an important variety of wires and cables due to their simple structure, convenient manufacturing and processing, and convenient construction and maintenance.
Extruded insulated power cable is also called rubber-plastic cable. It is a power cable with high polymer as the insulation. It is made of copper or aluminum wire twisted into a conductor, and then extruded for insulation, (metal tape), (inner lining/isolation sleeve) ), (armor layer), sheath layer (if there is a cable forming process, add the necessary filling materials). such as PVC XLPE insulated power cable 25-400mm2 Commonly used plastics are polyvinyl chloride, polyethylene, and cross-linked polyethylene.
Finished product production standards
The performance and quality of cable products are directly related to the safety of people’s lives and properties. Therefore, products must be produced in strict accordance with the requirements set by national standards, and various performance tests are also required before leaving the factory. There is a huge market demand for medium and low voltage extruded insulated power cables, and they have a wide range of applications. Once a potential safety hazard occurs, it is very easy to cause fires and other accidents. Therefore, it is necessary to check from the source to ensure product quality.
In 2020, in the latest national standard GB/T 12706.1～3-2020, the main production performance requirements for medium and low voltage extruded insulated cables are as follows:
1. The maximum temperature of the conductor during normal operation: PVC insulation 70°C; XLPE insulation 90°C;
2. When short-circuited (the longest duration does not exceed 5s), the maximum temperature of the conductor of the XLPE insulated cable does not exceed 250℃, and the maximum temperature of the conductor of the PVC insulated cable does not exceed 160℃;
3. The bending radius during cable laying should not be less than the following requirements: single-core unarmored cable 20D; single-core armored cable 15D; three-core unarmored cable 15D; three-core armored cable 12D (Note: D refers to Cable outer diameter)
Product performance advantage
Compared with GB/T 12706.1～3-2008, the latest national standards put forward new requirements on raw materials, processes and testing procedures. Such as cable armoring materials, especially when choosing armoring materials, especially when armoring is used as a shielding layer, the possibility of corrosion should be considered. This is not only for mechanical safety, but also for electrical safety; in terms of technology, The production process of the wrapping lining layer requires the use of single or multiple strips overlapped and wrapped. When multiple strips are wrapped, each one should overlap.
Since the release of the latest national standards for medium and low voltage extruded insulated cables, Far East has actively responded to national requirements, strictly controlling the purchase of raw materials, adjusting the process flow, and increasing the testing items to ensure the quality of the products.
The extruded insulated power cables below 35kV produced by Henan Huaxing are mainly suitable for transmission and distribution lines with AC rated voltages below 35kV. Among them, the main characteristics of flame-retardant cables are that they are not easy to catch fire or the flame spreads slowly after fire and can be controlled within a certain range. They are suitable for power stations, subways, tunnels, high-rise buildings, and large-scale industrial and mining industries with high cable laying density. , Oil fields, coal mines and other places.
Halogen-free low-smoke flame-retardant cables are characterized by their flame-retardant properties, low smoke and harmlessness (less toxicity and corrosion); flame-resistant cables are characterized by their ability to transmit power under normal working conditions , It can also maintain a certain period of safe operation under burning conditions. It is used in occasions where the cable has a higher fire resistance requirement.
For a long time, we have continued to explore the way of quality management and quality management, continue to improve the level of lean management, and set a benchmark for the transformation and upgrading of the cable industry in the new era. In the future, Henan Huaxing Wires & Cable Company will continue to improve its quality management model, from customer needs to customer satisfaction, take quality as its life, innovate and make breakthroughs, and achieve the ultimate in products and services!