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What is the difference between frequency conversion cables and ordinary cables?

The frequency conversion MV ABC cable has relatively strong pressure resistance and impact resistance, can withstand the pulse voltage of high-speed and frequent frequency conversion, and has a good protective effect on frequency conversion electrical appliances. It is mainly used to connect variable frequency power supply and variable frequency motor, and is widely used in papermaking, metallurgy, metal processing, railway, food processing and other fields. So, what is the difference between such frequency conversion cables and ordinary cables?

Shielding structure The frequency conversion cable generally adopts the overall shielding structure, mainly including copper ribbon combined shielding, copper ribbon shielding, copper wire braided shielding, etc., all of which have a certain proportion. This design can make the frequency conversion cable have better anti-electromagnetic induction, and can also resist the main interference of the power conduction signal, and can reduce the inductance to a certain extent, so that the induced electromotive force is too large. It can be prevented. The shielding layer can also play the role of suppressing the outward emission of electromagnetic waves and protect the wire core. The shielding layer of ordinary cables does not have this function, and the ability to resist trunk line interference is weak.

Electrical performance Frequency conversion cables can increase the capacity and inductance performance requirements on the basis of ordinary cables, and the electrical performance can be designed according to actual use requirements to make the cables more suitable for use conditions and save some intermediate components.

Manufacturing technology In the process of manufacturing cables and cables, compared with ordinary cables, frequency conversion cables need to go through insulated core extrusion and cabling process, the former directly affects the electrical performance of the cable, so in order to improve the performance, we use high-quality materials, in the technology In the manufacturing, great attention is paid to the purification of raw materials, to ensure that the extrusion process is rigorous and rigorous, and to ensure that the insulation eccentricity and insulation outer diameter must be controlled consistently. Further improve the electrical performance of frequency conversion cables. Four, cable symmetry Frequency conversion cables must be designed with a symmetrical structure. Ordinary cables are generally shielded by three insulated core copper tapes, while frequency conversion cables use copper wires pushed into the phase-separated sheath and then symmetrically penetrated into the cable, which has better interchangeability, electromagnetic compatibility and stronger anti-interference ability. In addition to introducing the difference between frequency conversion cables and ordinary cables in detail, it can be seen that the performance advantages of frequency conversion cables are not only significant, but also can greatly reduce the harm of electromagnetic radiation. .

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Aluminum/XLPE insulated wire core-35(XLPE-1.14)ABC-pressed 7*2.55

Insulation thermal extension detection value 60

Insulation thickness detection value 1.34

https://cable-conductor.com/abc-cable-3/

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Classification of wires and cables

"There are many types of cables, and different types correspond to different functions and application fields. Let's share with you the classification and application fields of wires and cables." Classification of wire and cable:

What are the commonly used wires and cables according to their uses? Answer: According to the purpose, it can be divided into bare wire, insulated wire, heat-resistant wire, shielded wire, power cable, control cable, communication cable, radio frequency cable, etc.

What types of insulated wires are there? Answer: Common insulated wires are as follows: PVC insulated wire, PVC insulated flexible wire, nitrile polyvinyl chloride mixture insulated wire, rubber insulated wire, agricultural underground direct buried aluminum core plastic insulated wire, rubber insulated cotton yarn textile soft wire Electric wires, polyvinyl chloride insulated nylon electric power, sheathed wires for lighting, polyvinyl chloride insulated cords, etc.

Where is the cable bridge suitable for? Answer: The cable tray is suitable for indoor and outdoor overhead laying of power cables and control cables in general industrial and mining enterprises. It can also be used for indoor and outdoor erection of telecommunications, radio and television departments.

What are the accessories for the ACSR? Answer: Common electrical accessories include cable terminal junction box, cable intermediate junction box, connecting pipe and terminal, steel plate junction groove, cable tray, etc.

What is the cable intermediate connector? Answer: The device connecting the conductor, insulation shielding layer and protective layer of the cable and the cable connecting the cable wire is called the cable intermediate joint. Wire and cable application:

Power system The wire and cable products used in the power system mainly include overhead bare wires, bus bars (busbars), power cables (plastic cables, oil-paper power cables (basically replaced by plastic power cables), rubber-sheathed cables, overhead insulated cables), branch cables (replacement Some busbars), electromagnetic wires, electric wires and cables for electrical equipment.

Information transmission system The wires and cables used in the information transmission system mainly include local telephone cables, TV cables, electronic cables, radio frequency cables, optical fiber cables, data cables, electromagnetic cables, power communication or other composite cables, etc.

Mechanical equipment and instrumentation system This part applies to almost all products except overhead bare wires, but mainly power cables, electromagnetic cables, data cables, instrument cables, etc. Wire and cable products are mainly divided into five categories:

Bare wire and bare conductor products The main features of this kind of products are: pure conductor metal, no insulation and sheath layer, such as steel cored aluminum stranded wire, copper-aluminum busbar, electric locomotive wire, etc.; the processing technology is mainly pressure processing, such as smelting, rolling, drawing, stranding Line/pressed stranded wire, etc.; products are mainly used in suburbs, rural areas, user trunk lines, switch cabinets, etc.

Power cord The main features of this type of product are: extruding (winding) the insulating layer outside the conductor, such as overhead insulated cables, or multi-core twisting (corresponding to the phase wire, neutral wire, and ground wire of the power system), such as overhead wires with more than two cores. Insulated cables, or sheathed, such as plastic/rubber sheathed wires and cables. Main technology has drawing, stranded, insulation extruded (wrapped), stranding, armouring, sheath to extrude etc., and the different craft combinations of various products are different. This product is mainly used for power generation, power distribution, power transmission, power transformation and power supply lines to transmit high current (tens of amperes to thousands of amperes), high voltage (220V to 500kV and above) strong electric energy.

Wires and cables for electrical equipment The main features of these products are: many varieties and specifications, wide application range, and can be used for voltages of 1kV and below. In the face of special occasions, new products are continuously derived, such as fire-resistant cables, flame-retardant cables, low-smoke zero-halogen/low-smoke low-halogen cables, termite-proof, rodent-proof cables, oil-resistant/cold-resistant/temperature-resistant/wear-resistant and corrosion-resistant cables, medical /agricultural/mining cables, thin-walled wires, etc.

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Low oxygen copper rod and oxygen free copper rod

Difference between the two

Low oxygen copper rod and oxygen free copper rod are different due to different manufacturing methods, which have their own characteristics.

1、 Inhalation, removal and presence of oxygen

The oxygen content of low oxygen copper rod is generally 200 (175) - 400 (450) ppm, so the entry of oxygen is inhaled under the liquid state of copper, while the oxygen free copper rod of upward drawing method is on the contrary. The oxygen is reduced and removed after being kept under the liquid state of copper for a long time. Generally, the oxygen content of this rod is below 10-50ppm, with a minimum of 1-2ppm. Oxygen in oxygen free copper is very low, so the structure of this copper is uniform and single-phase, which is beneficial to toughness.

2、 Difference between amount of sundries and hot rolling defects

Compared with the low oxygen copper rod in all wire diameters, the pull ability of the oxygen free copper rod is superior. In addition to the above organizational reasons, the oxygen free copper rod has less inclusions, stable oxygen content, no possible defects caused by hot rolling, lax oxygen monitoring, and unstable oxygen content, which will directly affect the performance of the rod. If the surface oxide of the rod can be made up in the continuous cleaning of the later process, but it is troublesome that a considerable amount of oxide exists under the "skin", which has a more direct impact on the wire breaking of the stay wire.

3、 The toughness of low oxygen copper rod is different from that of non oxygen copper rod

Both can be pulled to 0.015mm, but the spacing between the filaments of low-temperature oxygen free copper in low-temperature superconducting wire is only 0.001mm.

4、 The wire making process of low oxygen and non oxygen copper rods is different

The wire making process of low oxygen copper rod cannot be transferred to the wire making process of oxygen free copper rod. At least the annealing process of the two is different. Because the softness of the wire is deeply affected by the material composition and rod making, wire making and annealing process, we can not simply say that low oxygen copper or oxygen free copper is soft and hard.

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Application scope of flexible mineral insulated cable

Flexible fireproof cables, also known as "inorganic mineral insulated cables", are developing rapidly in China because they are softer and easier to install and lay than mineral insulated cables.

Bttw copper core rolled copper sheath soft inorganic mineral insulated fireproof cable, rated voltage 750V. Yttw copper core rolled copper sheath soft inorganic mineral insulated fireproof cable, rated voltage 750V. Yttwg copper core smooth copper sheath flexible inorganic mineral insulated fireproof cable, rated voltage 500V. Yttwv rated voltage 750V copper core rolled copper sheath PVC outer sheath soft inorganic mineral insulated fireproof cable. Dw-yttwy copper core rolled copper sheath low-smoke halogen-free polyolefin outer sheath flexible inorganic mineral insulated solar cable, rated voltage 750V. Low installation cost: Due to advanced manufacturing technology and simple installation, under the same conditions, the overall cost of flexible fireproof cables is significantly lower than that of mineral insulated cables. Composition of flexible mineral insulated cables (bbtrz): flexible mineral insulated cables are composed of copper strands, mineral composite insulation and mineral composite sheath. It adopts a flexible structure, and the main material is inorganic materials, which makes up for the defects of hard structure, flammability and toxicity. It also has some advantages that other cables do not have, such as fire resistance, large carrying capacity, impact voltage resistance, mechanical damage resistance, halogen-free and non-toxic, explosion-proof, waterproof, corrosion resistance, long service life, safety, overload resistance, high temperature resistance ,low cost. Flexible mineral insulated cables (bbtrz) have general product characteristics. Since the insulation of wires and cables is made of organic polymer materials, it is easily carbonized under flame conditions and loses its insulation function. Since the main material of the flexible mineral insulated fireproof cable (BBTRZ) is composed of mineral compounds, it will not cause fire by itself, and cannot burn or support combustion. The melting point of these materials is generally above 1500°C, so the fireproof cable can still perform normal power transmission functions even in the presence of flames, and it is a real fireproof cable. The process structure of the flexible mineral insulated fireproof cable (bbtrz) is exactly the same as that of the traditional cable, successfully solving many shortcomings of the product determined by the production process of the magnesium oxide copper rod mineral insulated cable (bttz). Pros summary: Really flexible, construction is as soft as a normal cable. The process structure is the same as that of ordinary cables. The theoretical output is infinite, and a cable can be produced at a fixed length. There are no joints in the installation, the construction is simple, the reliability is improved, and the input cost is reduced. Multi-core can produce 300mm2, which overcomes the shortage of single-core rigid bttz greater than 25mm2. Cables are reusable. The cable can be removed and reused when the line is modified or adjusted.

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MV Aerial Bundled Cable

MV Aerial Bundled Cable

Conductor: Round, Aluminium Conductor Conductor Screen: Extruded semi-conductive layer. Insulation: XLPE insulation Screen: Extruded semi-conductive layer. metallic Screen(optional): Copper wire screen or copper tape screen. Separator: Semi-conductive swellable tape. Outer Sheath: HDPE. Messager wire: Galvanized steel wires. Assembly: Three XLPE insulated screened cores are bundled around the galvanized steel wires in a right hand lay. MV Aerial Bundled Conductor ABC Cables Application: Aerial bundled cables are mainly used for secondary overhead lines on poles or as feeders to residential premises.

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Control cable is a kind of cable protecting circuit. The main material of this cable is PVC. Because of its excellent insulation performance, the cable can work normally under rated 450/750 volts, so it can control the operation of the circuit well. The application range of control cable is very wide, including some factories and mines enterprises and large energy departments.

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As a representative of the wire and cable industry in the field of photovoltaic power equipment, Henan Huaxing Wire and Cable Co., Ltd. participated in this exhibition and brought the company's core product - a new material aluminum alloy Solar Cable. This is a high-end new material alloy photovoltaic cable integrating technology research and development, professional certification, production and processing, green energy saving, and 5G digital intelligent system application. Through the unique heat treatment technology, the elongation rate of the product can reach 25%, which is far higher than the 10% elongation rate standard required by UL in the United States. The comprehensive performance has a leading advantage in the country and even in the world.

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The ACSR cable is a Aluminium conductor steel-reinforced cable, the utility model has the advantages of simple structure, convenient installation and maintenance, low circuit cost, large transmission capacity, favorable laying across rivers and valleys and other special geographical conditions, good electrical conductivity and sufficient mechanical strength, large tensile strength, and the distance between towers and poles can be enlarged. Therefore, it is widely used in various voltage levels of overhead transmission and distribution lines.

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Qualification Standards for Cable Sheathing

Qualification Standards for Cable Sheathing

According to the above two analysis, it is not difficult to see that the first characteristic of product quality is reflected in the appearance quality of the product. No matter what kind of product or semi-finished product, we must pay attention to the appearance in production. Quality is strictly controlled and inspected. The sheath is the appearance of the cable, and its appearance is required to be smooth and round, with uniform luster, no eccentricity (not exceeding the specified deviation), no mechanical damage, flattening, no visible sundries, bubbles, sand holes, obvious particles, bamboo Section shape, twist shape, etc. In addition to meeting the above quality requirements for the sheath, the thickness of the sheath also has a certain influence on the quality of the cable. If the sheath thickness of the cable in production is lower than the standard requirement, it is unqualified, and the thickness exceeds the standard requirement. For example: the MV ABC cable model is DLD-KYJV223*1.5mm2, and the measured average thickness of the sheath is 1.7mm. If this model refers to the requirements of the GB9330-88 standard, the thickness should be 1.2mm. Precautions for sheath production

Calculate the thickness of the control sheath according to the standard, and the calculation formula is: D (outer diameter before extrusion) × 0.035+1; Online measurement of sheath thickness: sheath thickness = (circumference after extrusion sheath - circumference before extrusion sheath) / 2π or sheath thickness = (perimeter after extrusion sheath - circumference before extrusion sheath )×0.1592; Thinnest point of single core sheath: nominal value × 85%-0.1; Thinnest point of multi-core sheath: nominal value×80%-0.2; Increase the temperature of the low-density polyethylene sheathed extruder to increase the stress-cracking resistance, because the extrusion temperature is too high, it is easy to cause the plastic to burn, or "slip" phenomenon; in addition, the shape stability of the extruded layer is poor, shrinkage rate increases, and even cause discoloration and bubbles in the extruded plastic layer; Do a good job in the extruder body and screw cooling system to eliminate frictional overheating, so as to maintain the heat balance during the extrusion process, stabilize the extrusion pressure, promote the uniform mixing of plastics, and improve the plasticizing quality. To sum up, in the production process, only by carefully operating the equipment and strictly controlling the thickness of the sheath according to the standard requirements, can we not only save resources for the enterprise, reduce material consumption, increase profits, but also ensure the quality of cables and create high-quality products. Excellent and cheap product.

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The main products of Huaxing Cable are AAC/AAAC/ACSR/ACAR Conductor, overhead bunched cable (ABC cable),Control cable, concentric cable, low voltage and medium voltage power cable, plastic wire, solar power cable, protection cable, etc.

We have also passed ISO9001 quality system, ISO14001 environment system, OHSAS18001 occupational health system, CCC national product certification. And so on; We can also produce wire and cable products according to IEC, ASTM, BS, DIN, AS, CSA, JIS, KS and other standards to meet the specific needs of customers.tection cable, etc.

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We supply Medium Voltage Aerial Bundle Cables, in voltages of 6.35/11kV, 12.7/22kV and 19/33kV. Manufactured in accordance with IEC 60502-2, we also have variants made specifically to Australian and New Zealand standards AS/NZS 3599 Part 1. In addition to the XLPE insulation, these higher voltage cables are sheathed with High Density Polyethylene (HDPE). They are available with and without additional screening, in light and heavy duty copper wire or tape, depending on the installation parameters and requirements.

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Photovoltaic cables and their characteristics

PV Cable (Solar Cable) PV Cable & Wire (Photovoltaic Cable) main characters are Low smoke without halogen, good cold, ultraviolet, ozone – resistant and weather – resistant. Flame retardant, cutting resistance and penetration resistance. Cable protection level Ⅱ level. With 150℃ photovoltaic cable radiation as insulation materials, halogen free flame retardant is halogen-free, non-toxic modified polyethylene thin resin as the main raw material, add halogen-free, non-toxic, flame retardant, heat stabilizer, eliminate smoke agent, preservative, such as fertilizer, does not contain halogen, heavy metals, phosphorus. It conforms to ROHS, and the insulation resistance is small after immersion. Product features：

PV Cable & Wire (Called photovoltaic Cable) main characters are Low smoke without halogen, good cold, ultraviolet, ozone – resistant and weather – resistant. Flame retardant, cutting resistance and penetration resistance. Cable protection level Ⅱ level. With 150℃ photovoltaic cable radiation as insulation materials, halogen free flame retardant is halogen-free, non-toxic modified. Polyethylene thin resin as the main raw material, add halogen-free, non-toxic, flame retardant, heat stabilizer, eliminate smoke agent, preservative, such as fertilizer, does not contain halogen, heavy metals, phosphorus. It conforms to ROHS, and the insulation resistance is small after immersion.

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Bare Stranded Conductor

Cable products with only conductors but no insulation layer are called bare conductor products. The most widely used conductors today are copper and aluminum. Aluminum conductors include AAC/AAAC/ACSR/ACAR/AACSR, aluminum-clad steel, etc.