Detailed Introduction to Vvg, Avvg, Yjlv Series 1kV Low-Voltage Cables
I. From the Perspective of the Product Itself
(I) Specification Parameters
4X240mm² Specification
The 4X240mm² specification cable in the Vvg, Avvg, and Yjlv series has a rated voltage of 1kV and belongs to the category of low-voltage cables. This specification cable contains
4 Conductors, 3 of which are phase conductors and 1 is a neutral conductor. Each conductor has a cross-sectional area of 240mm², suitable for three-phase four-wire distribution systems.
In terms of current-carrying capacity, this specification cable performs excellently. When laid in air, the long-term allowable current-carrying capacity is approximately 320A; when laid in soil, due to the better heat dissipation conditions of the soil, the long-term allowable current-carrying capacity can reach 350A, which can meet the needs of high-power electricity scenarios such as large industrial equipment.
The insulation layer thickness is 1.8mm, made of high-purity PVC material, which can effectively block current and ensure safe transmission under 1kV voltage. The outer diameter of the cable is about 65mm, and its compact structural design allows it to save space during laying.
The bending radius is an important parameter during cable installation. The static bending radius of this specification cable is not less than 12 times the cable outer diameter, and the dynamic bending radius is not less than 20 times the cable outer diameter. It must be strictly followed during installation to avoid damage to the cable due to excessive bending.
3X240mm² Specification
The 3X240mm² specification cable also has a rated voltage of 1kV, consisting of 3 conductors with a cross-sectional area of 240mm², all of which are phase conductors, suitable for three-phase three-wire distribution systems.
Its current-carrying capacity is similar to that of the 4X240mm² specification. When laid in air, the long-term allowable current-carrying capacity is about 310A, and when laid in soil, it is about 340A, which can meet the power transmission needs of centralized power consumption scenarios such as large commercial buildings.
The insulation layer thickness is also 1.8mm, with good insulation performance. The outer diameter of the cable is about 58mm, which is slightly smaller than that of the 4X240mm² specification, making it more advantageous in some laying environments with limited space.
The bending radius requirements are consistent with the 4X240mm² specification, with the static bending radius not less than 12 times the cable outer diameter and the dynamic bending radius not less than 20 times the cable outer diameter, to ensure that the performance of the cable is not affected during installation.
3X185mm² Specification
The 3X185mm² specification cable has a rated voltage of 1kV, containing 3 phase conductors with a cross-sectional area of 185mm², suitable for three-phase three-wire distribution systems, mainly used in medium-load scenarios.
In terms of current-carrying capacity, this specification cable has a long-term allowable current-carrying capacity of about 230A when laid in air and about 250A when laid in soil, which can meet medium-sized power demand such as shopping mall floor branch lines.
The insulation layer thickness is 1.6mm, which can ensure the insulation effect under 1kV voltage. The outer diameter of the cable is about 50mm, and its small outer diameter makes it more flexible during laying.
In terms of bending radius, the static bending radius is not less than 10 times the cable outer diameter, and the dynamic bending radius is not less than 15 times the cable outer diameter, facilitating operation in various installation environments.
(II) Characteristic Uses
4X240mm² Specification
The main power distribution system of industrial plants is the main application scenario of the 4X240mm² specification cable. There are many large production lines, heavy machinery and other high-power equipment in large factories. These equipment adopt three-phase four-wire power supply, with large and stable power demand. This specification cable, which includes a neutral wire, can well adapt to this power supply system, providing continuous and stable power support for the equipment and ensuring the smooth progress of industrial production.
In addition, some public power distribution facilities in large industrial parks, such as transmission lines from centralized distribution boxes to various factories, also often use this specification cable to ensure stable and reliable power supply for various enterprises in the park.
3X240mm² Specification
The 3X240mm² specification cable is mostly used for power trunk lines in large commercial buildings. Places such as large shopping malls and high-rise office buildings have dense electrical equipment and huge total power consumption, and three-phase three-wire power trunk lines are used for power supply. This specification cable has a large current-carrying capacity, which can meet the centralized power demand of these places and efficiently transmit power from the main distribution room to the distribution branch points in various areas.
The main transmission lines of large public buildings such as large stadiums and convention centers also often use this specification cable, which can ensure the normal operation of various electrical equipment during large-scale events.
3X185mm² Specification
Shopping mall floor branch lines are a typical application scenario of the 3X185mm² specification cable. In large shopping malls, each floor has many shops and public facilities, and it is necessary to distribute power from the main line to the power points on each floor. This specification cable has a moderate current-carrying capacity and can meet the power distribution demand of such medium-sized loads.
The municipal street lamp system also extensively uses this specification cable. Street lamps are widely distributed, with small power per lamp but a large total number. The 3X185mm² specification cable can stably provide power for the street lamp system, ensuring road lighting at night.
The power distribution of small and medium-sized factory workshops is also suitable for using this specification cable. The small and medium-sized production equipment in the workshop has relatively small power demand, and this specification cable can meet their normal production power consumption.
(III) Material and Style
Conductor Material
The conductors of these three specifications of cables are all made of aluminum material and processed through circular compacted stranding technology. Aluminum material itself has the characteristics of abundant resources and relatively low price, which can reduce the overall cost of the cable. After compacted stranding, the filling density of the conductor is increased to more than 90%, which not only enhances the mechanical strength, enabling it to withstand stresses such as stretching and bending during laying, but also reduces the gaps between conductors, lowers the power loss caused by the skin effect, and makes the conductivity closer to that of
Copper Conductors, ensuring transmission efficiency while taking into account economy.
Insulation Layer Material
The insulation layer is made of high-purity PVC material and improved through a special formula. The improved PVC material can withstand a long-term temperature of up to 70℃ and a short-term overload temperature of 90℃, which can adapt to temperature changes under different working conditions. At the same time, it has good insulation performance, with an insulation resistance stable above 1000MΩ, which can effectively block current and prevent electric leakage and short-circuit accidents. In addition, this material can resist erosion from moisture, chemical substances, etc., and is suitable for use in complex environments.
Sheath Material
The sheath of the cable also mostly uses PVC material, and some models may use other materials according to different usage scenarios. The
PVC Sheath has good mechanical properties, which can protect the internal conductors and insulation layer from external mechanical damage such as collision and extrusion. It also has certain corrosion resistance and weather resistance, can adapt to different laying environments, and extend the service life of the cable.
Style Design
The three specifications of cables are all designed in a circular shape with a compact structure. The conductor is wrapped with a
PVC Insulation layer, and the insulation layer is wrapped with a sheath to form a multi-layer protection structure. The color of the cable is usually black, which has good dirt resistance and concealment, and can maintain a relatively stable appearance in various laying environments. The surface of the cable is smooth and flat, without obvious protrusions or depressions, which is convenient for operations such as pipe threading and dragging during installation, reducing laying resistance.
(IV) Production Process
Conductor Production
First, the aluminum ingot is smelted to remove impurities, obtaining aluminum water that meets the purity requirements. Then, the aluminum water is cast into aluminum rods through a continuous casting process, and the diameter of the aluminum rods is adjusted according to the specifications of the
Cable Conductor. Next, the aluminum rod is drawn into
Aluminum Wires of the required diameter through a wire drawing process. During the wire drawing process, it is necessary to strictly control the drawing speed, temperature and lubrication conditions to ensure the quality of the
Aluminum Wire. After that, multiple aluminum wires are stranded according to the circular compacted stranding process. During the stranding process, the aluminum wires are compacted through a mold to improve the filling density of the conductor and enhance its mechanical strength and conductivity.
Insulation Layer Extrusion
The extrusion molding process is used to wrap the PVC insulation layer around the conductor. First, high-purity PVC granular material is added to the hopper of the extruder. After being heated and melted, the molten PVC material is transported to the mold through the screw of the extruder. The size of the mold is accurately designed according to the cable specifications to ensure uniform thickness of the insulation layer. During the extrusion process, the extrusion temperature, extrusion speed and pressure are strictly controlled, so that the molten PVC material evenly coats the surface of the conductor to form a continuous and dense insulation layer. After extrusion, the insulation layer is cooled and solidified to set its shape.
Cabling Process
For the 4X240mm² specification cable, 3 phase conductors and 1 neutral conductor are stranded according to a certain stranding direction and pitch; for the 3X240mm² and 3X185mm² specification cables, 3 phase conductors are stranded. The size of the stranding pitch will affect the
Flexibility and structural stability of the cable, and needs to be reasonably set according to the cable specifications. During the stranding process, in order to ensure the roundness and filling rate of the cable, some inert filling materials such as polypropylene ropes are filled between the conductors. The filling materials can also play a buffering role, reducing friction and extrusion between conductors.
Sheath Extrusion
A sheath is extruded on the outer layer of the cabled cable. PVC material is added to the extruder, heated and melted, and then evenly coated on the outer layer of the cabled cable through an extrusion mold. The extrusion parameters are controlled to ensure that the sheath has uniform thickness, a smooth surface, and is closely combined with the internal cabling structure without defects such as bubbles and impurities. The extrusion of the sheath can further enhance the mechanical protection performance and environmental erosion resistance of the cable.
Quality Inspection
Strict quality inspection is carried out in each link of the production process. For the conductor, parameters such as its diameter, resistivity, and tensile strength are tested; for the insulation layer, properties such as its thickness, insulation resistance, voltage resistance, and temperature resistance are tested; for cabling and sheathing, the appearance, size, roundness, and the tensile strength and elongation at break of the sheath are tested. The finished cable also needs to undergo partial discharge tests, aging tests, etc., to ensure that the product meets relevant standards and technical requirements. Only cables that pass all tests can leave the factory for sale.
II. From the Perspective of General Product Information
(I) Packaging
Packaging Materials
According to the specifications and lengths of the cables, appropriate packaging materials are selected. Cables of 4X240mm² and 3X240mm² specifications, due to their large cross-sectional area and heavy weight, are usually packaged with steel cable reels. Steel cable reels have high strength and strong bearing capacity, which can well protect the cables from damage during transportation and storage, and are suitable for long-distance transportation and packaging of long-length cables. Cables of 3X185mm² specification can use wooden cable reels, which have relatively low cost and light weight, suitable for medium and short-distance transportation and small-batch delivery.
Packaging Method
When packaging, the cable is neatly wound on the cable reel, arranged tightly and flatly, avoiding twisting, crossing and overlapping, so as to prevent the cable from being squeezed and worn during transportation and storage. The outermost layer of the cable is wrapped with a plastic film, which has good moisture-proof and dust-proof performance and can protect the cable from pollution by the external environment. For steel cable reels, strong baffles are added on the sides to prevent the cable from slipping; baffles are also added on the sides of wooden cable reels to ensure the stability of the cable. A shaft sleeve is installed at the central shaft hole of the cable reel to facilitate handling and loading/unloading with equipment such as forklifts and cranes.
Packaging Marks
Relevant product information is clearly and firmly marked on the side and end face of the cable reel, including product name (Vvg, Avvg, Yjlv Series 1kV Low-Voltage Cables), specification parameters (4X240mm², 3X240mm², 3X185mm²), length, rated voltage, implementation standard, production date, production batch number, manufacturer's name, address, contact information, etc. These marks facilitate users to identify product information when receiving and inspecting the cable, and are also conducive to product traceability and quality management.
(II) Transportation
Transportation Mode
According to the transportation distance, quantity of cables and customer needs, a suitable transportation mode is selected. For long-distance transportation with large quantities, railway transportation is an ideal choice. Railway transportation has large transport capacity, low cost and stable transportation process, which can effectively ensure the safety of the cable. For medium and short-distance transportation, road transportation can be adopted, which has high flexibility and can realize door-to-door service, facilitating customers to receive goods. For urgent orders or small batches of sample transportation, car express transportation can be used. Although the cost is relatively high, it can shorten the transportation time and ensure the timely delivery of goods.
Transportation Precautions
Before transportation, carefully check the packaging of the cable to ensure that the cable reel is intact, the cable is tightly wound, and the plastic film is tightly wrapped. During transportation, the cable reel must be placed horizontally, and tilting, inverting or stacking are strictly prohibited to prevent the cable reel from rolling and colliding, which may cause damage to the cable. The transport vehicle should drive smoothly, avoiding violent operations such as sudden braking and sharp turns, to reduce the shaking of the cable reel. At the same time, measures should be taken to prevent rain, sun and moisture. A rain cloth can be covered on the cable reel to avoid the cable being soaked by rain, exposed to the sun or damp, which may affect the performance of the cable. When loading and unloading the cable, special lifting equipment such as cranes and forklifts must be used. During loading and unloading, handle with care to avoid impact and damage to the cable and cable reel.
Transportation Fixation
To prevent the cable reel from moving and rolling during transportation, it is necessary to fix it firmly. Steel wire ropes, iron chains, etc. can be used to tightly fix the cable reel on the carriage of the transport vehicle. The fixed points should be selected at the solid parts of the cable reel, such as the flange of the steel reel or the reinforcing ribs of the wooden reel, to ensure reliable fixation. For long-distance transportation, buffer materials such as wooden boards and rubber pads can also be placed between the cable reels to reduce mutual collision and friction between the cable reels.
(III) Delivery
Delivery Process
After the customer places an order and makes payment, the sales department will promptly transmit the order information to the warehouse and production department. Warehouse personnel prepare goods according to the order information. For stock products, it is necessary to carefully check whether the specifications and quantity of the products are consistent with the order; for customized products, the production department organizes production according to the order requirements. After production is completed, the products are inspected by the quality inspection department and then transferred to the warehouse. After packaging the products, the warehouse personnel contact the transportation company to determine the transport vehicle, transportation route and transportation time. Before delivery, the delivery information, such as the name of the transportation company, license plate number, waybill number, estimated arrival time, etc., is promptly informed to the customer to facilitate the customer's preparation for receiving the goods.
Delivery Time
For regular specification cables in stock, delivery will generally be completed within 1-3 working days after receiving the customer's order and confirming payment. For cables that need to be produced according to the customer's special requirements, the delivery time will be determined according to the production cycle, usually 7-15 working days. The specific delivery time will be communicated and confirmed with the customer in advance, so that the customer can clearly understand the production progress and estimated delivery time of the goods.
Delivery Tracking
After the cable is delivered, the company will track the transportation status of the goods throughout the process. By maintaining close contact with the transportation company, timely obtain information such as the location and transportation progress of the goods. If there are abnormal situations during transportation, such as traffic jams, bad weather, etc., which cause transportation delays, the customer will be notified immediately, and active coordination with the transportation company will be made to try to shorten the delay time and ensure that the goods can be delivered to the customer as soon as possible.
(IV) Samples
Sample Provision
To allow customers to better understand the quality, performance, and appearance of Vvg, Avvg, Yjlv series 1kV low-voltage cables, the company can provide samples of the three specifications. Customers can choose samples of the corresponding specifications according to their own needs. The length of the samples is generally 1-2 meters, which can meet the customers' inspection of the conductor material, insulation layer and sheath quality, and structural design of the cable.
Sample Cost
The samples themselves are provided to customers free of charge, but customers
need to bear the express fee for the samples. For large customers with clear cooperation intentions or long-term partners, the company will reduce or exempt the express fee for the samples according to the actual situation to promote cooperation between the two parties.
Sample Delivery
After receiving the customer's sample request, the company will prepare the samples within 1-2 working days and package them properly. During packaging, the specification parameters and other information will be clearly marked on the samples to prevent damage or confusion during transportation. Then, the samples will be sent to the customer via a reliable express method, and the express tracking number will be promptly informed to the customer to facilitate them to check the transportation status of the samples.
(V) After-sales Service
Quality Assurance
The company promises that the Vvg, Avvg, Yjlv series 1kV low-voltage cables produced and sold comply with relevant national standards and industry norms, with a product quality guarantee period of 1-3 years. During the quality guarantee period, if the cable has quality problems caused by non-human factors, such as aging of the insulation layer, sheath damage, conductor breakage, etc., the company will provide customers with free repair or replacement services.
Technical Support
The company has a professional technical team to provide customers with comprehensive technical support. Customers can contact technical personnel at any time through phone calls, emails, online consultations, etc. when encountering any technical problems during the installation, laying, and use of the cable. Technical personnel will give detailed answers and professional guidance in a timely manner. For some complex technical issues, the company can arrange technical personnel to go to the site for guidance and assistance to ensure the installation quality and normal use of the cable.
Fault Handling
If customers find that the cable is faulty during use, they should notify the company in a timely manner. After receiving the notification, the company will respond within 24 hours, arrange professional personnel to communicate with the customer to understand the specific situation of the fault, analyze the cause according to the fault phenomenon, and formulate a solution. For faults that require on-site handling, technical personnel will be arranged to rush to the site for repair or replacement as soon as possible to minimize the losses caused by cable faults to customers.
Customer Feedback
The company attaches great importance to customers' feedback and has set up various customer feedback channels, such as customer service hotlines, emails, and online message boards. Any problems encountered or suggestions put forward by customers during the use of the product can be fed back to the company through these channels. The company will arrange special personnel to sort out, analyze, and handle customers' feedback and reply to customers within a specified time. At the same time, the company will continuously improve product quality and service levels according to customers' feedback to improve customer satisfaction.
In conclusion, the 4X240mm², 3X240mm², and 3X185mm² specifications of Vvg, Avvg, Yjlv series 1kV low-voltage cables have their own advantages in terms of specification parameters, characteristic uses, material styles, and production processes, and can meet the needs of different low-voltage distribution scenarios. Meanwhile, perfect general information services such as packaging, transportation, delivery, samples, and after-sales provide customers with all-round guarantees, making them an ideal choice in low-voltage distribution systems.
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