Branch cable structure characteristics and performance technology advanced analysis-Henan Sanheng Cable Co.,Ltd

Branch cable structure characteristics and performance technology advanced analysis

Jun 15,2018

The branch cable is a new kind of building distribution cable, which is widely used in the power distribution of medium and high-rise buildings, large-scale factory buildings, sports venues, and street lamp power supplies. The product will be based on the structural characteristics and distribution requirements of each specific building, The special design and manufacturing of the branch cable and the branch connection body have excellent technical and economical indicators. Compared with the traditional cable and busbar (busway), the engineering economy, technology advancement and installation convenience have outstanding advantages. . This article aims to briefly introduce the product's compliance with the relevant specifications of building electrical, and analyzes and introduces the technological advancement of branch cable structure and performance.

Analyze branch cable structure features and performance technology advancement

First, the branch cable production, structure and performance

Branch cable structure characteristics and performance technology advanced analysis

1, production and technical standards

Due to the development of modern civilization, high-rise buildings are becoming more and more popular. In the electrical design of high-rise building distribution systems, power supply reliability, engineering economics, and construction convenience are more and more important, but ordinary power cables are used to add T boxes or busbars. (Busbar) power supply, the contradiction between the three is difficult to unity, can only be focused on different projects. There are three commonly used methods in floor distribution design:

Branch cable structure characteristics and performance technology advanced analysis

1) Radiating type: The low-voltage power distribution room directly supplies power to the cables at each floor. This method has the best reliability, but it requires a large number of cables, bridges, and large electrical shafts. The cost is high and the economy is the worst.

2) Linking method: from the low-voltage distribution room to the cable to a certain distribution box, and then a layer upward (or downward) link power supply, this method is the best economy, but because of the more layers, the safety factor The lower the  safety factor is multiplied step by step, so the reliability is the worst and less used.

3) Partitioned trunk: A high-rise building is divided into a number of unit areas. Each unit is powered by cables from a low-voltage distribution room, and then through radial distribution to various floors in the unit area. This method is more reliable and economical and is often used.

Analyze branch cable structure features and performance technology advancement

4) Trunk cable branching method: One or several trunk cables are led from the power distribution room, and each floor is connected to the trunk cable. This method is the most economical, and theoretically it also has the reliability of radial power distribution. But construction is the most troublesome. More importantly, when the main branch cable is used as the floor branch head, the quality of the joint is not uniform due to the influence of the cable structure, on-site construction conditions, and the quality of the personnel, and the reliability of the actual operation is not satisfactory. However, this approach has prompted people to think of the special manufacture of connectors and cables, which led to the birth of a new generation of building distribution cables - branch cables.

Branch cables are based on common all-plastic power cables in order to meet people's needs.

Branch cable structure characteristics and performance technology advanced analysis

2, branch cable structure and performance

According to the current market conditions, branch cables are divided into pre-branch cables and puncture branch cables. They have similarities and differences.

Common points:

In terms of structure, they are divided into single-core type and multi-core type. Each single-core branch cable can be divided into three parts: (1) trunk cable; (2) branch cable; (3) branch connector . The backbone cable conductor has no joints and has good continuity, reducing the failure point and contact resistance.

In terms of performance, the branch cable is a new type of power distribution cable. The contact resistance of the branch joint is extremely small, and it is not affected by thermal expansion, contraction and slight vibration. Has excellent shock resistance, airtightness, waterproof, and maintenance-free. There are two key performance features:

First of all, the branch cable is a type of cable developed from the cable. Its conductor performance, insulation performance, and mechanical physical properties of the material should all meet the GB 12706-91 standard. This is the basic indicator of the branch cable product.

Second, the performance of the branch connector is crucial. This is the key performance of the branch cable. Its professional manufacturing and processing ensure the reliability of the product. The branch connector connects the trunk cable with the conductor of the branch cable and is insulated and protected against moisture.

At present, due to the simple structure of the single-core branch cable, which is convenient for production and construction, it has obtained numerous applications. The multi-core type branch cable is essentially a stranded body of a plurality of single-core type branch cables instead of the structure of a conventional concept multi-core cable. Each multi-core type branch cable has a separate insulation and sheath outside each phase conductor. The core has separate branch connectors. The multi-core branch cable has the performance of the general multi-core cable. Only a few large-scale integrated cable factories in China have the production capacity. Generally, they are only applicable to small-section backbone cables, and they are currently being applied.

difference:

Structurally:

1) The prebranch cable is a single-core power cable that has undergone specialized processing as a construction backbone cable. According to the structural features and dimensions of each specific building, the branch connector is designed in advance with the branch line and trunk cable, and is completed by a professional manufacturer. The reliability of the joint is greatly improved, and the process consistency ensures the consistency of quality and achieves the purpose of ensuring operational reliability.

2) The main cable of the puncture branch cable adopts the common ordinary plastic cable, and the branch joint adopts the advanced imported insulated core puncture clamp technology. It is connected at the installation site, which increases the flexibility of the installation site and makes installation and transportation more convenient. Puncture clips have many specifications, branch lines are flexible, any combination, and simple operation.

In terms of performance:

1) From the appearance point of view, the pre-branch cable cannot know the quality of the internal joint. Only two important tests can test the performance of the joint, namely the mechanical tensile test and the electric heat cycle test. For mechanical tensile tests, the breaking force of the branch connector (including trunk and branch conductors) should be maintained at more than 80% before connection, and for the electrothermal cycling test, rated load and no load at 125 intervals. After cycling, the temperature rise of the branch connector shall not be higher than 8 °C at the branch head temperature of 25 cycles. The key to determining the mechanical and electrical properties of the branch connector is the material and process of the branch connector. For the majority of users, it should pay full attention to the cable quality of branch cables, the material selection of joints, and the production process equipment.

2) The IPC insulation piercing clamp of the puncture branch cable has a torque nut and a piercing structure. The moment nut is used to ensure a constant contact pressure, ensure good electrical contact, and is easy and reliable to install together with the piercing structure. Only the visual moment is needed during installation. Whether the nut is twisted or not and the position of the wire is appropriate can ensure reliable quality. After testing, the contact resistance and the line insulation resistance meet the requirements of the construction specification. The use of IPC insulation puncture clips has little effect on the mechanical and electrical properties of the mains. The puncture branch joint structure is generally made using the advanced imported insulated core puncture clamp technology. The branch joint production has strict technical standards and inspection requirements, as well as a strict quality assurance system. The installation does not require special tools and does not require special handling of wires and clamps. The operation is simple and quick. Compared with the conventional wiring method, it eliminates the need to strip insulating layers, solder tin or crimp terminals, and insulate and wrap. The construction waste such as insulation layer and electric wire head is reduced, the construction electricity consumption and the potential safety hazards caused by electricity consumption are reduced, the environmental pollution that is difficult to prevent from conventional practices is reduced, the installation space required is small, and the installation efficiency can be greatly improved. Save on labor and installation costs.

Henan Sanheng Cable Co., Ltd , founded in 2000, It is one of the top wire and cable manufacturers in China's wire and cable industry for nearly 20 years. the company has more than 5 production lines.

The production cable can be divided into more than 50 varieties and subdivided into 1000 specifications.All products have passed national certification, such as China compulsory certification, bv certification, Nigerian SONCAP certificate, China national industrial certification, etc. China national industrial production license, etc.It also has the ability to produce products that meet international standards, such as iec, ce, rohs, etc.
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