I. Product - Related Information
(I) Specifications and Parameters
This series of cables (including models such as Yjv22 and N2xby) have a rated voltage of 0.6/1kV and a specification of 3*150+95sqmm. They are cable products specially designed for underground power transmission, and various parameters are suitable for complex underground power transmission environments.
The cable adopts a 4 - core structure, with 3 main wires with a cross - sectional area of 150sqmm and 1
Ground Wire with a cross - sectional area of 95sqmm. The diameter of the main wire conductor is about 14mm, and the diameter of the ground wire conductor is about 11mm. After adding the insulation layer, double steel tape armor layer and outer sheath, the overall outer diameter is about 35 - 40mm.
In terms of electrical performance, the current - carrying capacity of the main wire is about 230 - 250A in a 25℃ environment, which can meet the needs of medium - and high - voltage power transmission. The insulation resistance is not less than 1000MΩ·km at 20℃, and the insulation performance is stable, which can effectively prevent current leakage. Its maximum short - circuit withstand temperature can reach 250℃ for no more than 5 seconds, which can buy time for the operation of circuit protection devices when a short - circuit fault occurs.
In terms of mechanical performance, the bending radius of the cable is not less than 12 times the outer diameter of the cable, which is convenient for steering operations during underground laying. The double steel tape armor layer enables the cable to withstand a radial pressure of not less than 8kN, which can resist the pressure of underground soil. At the same time, the cable has good tensile performance and can bear the traction force during laying.
(II) Characteristic Uses
Underground Power Trunk Lines
In the urban power network, the cable can be used as an underground power trunk line to connect substations in different urban areas and realize long - distance power transmission. For example, in the construction of new urban areas, using it as a trunk line can transmit power from the urban central substation to various districts, providing guarantee for industrial, commercial and residential power consumption in the districts. Due to its good insulation and protection performance, it can operate stably underground for a long time, reducing the impact of line faults on urban power supply.
Municipal Power Grid Laying
The cable can be used for power supply lines of public facilities such as road lighting and traffic lights in municipal engineering. In road reconstruction projects, it is buried underground on both sides of the road to supply power to street lamps, traffic monitoring equipment, etc. The double steel tape armor layer can resist mechanical impact caused by road construction and vehicle driving, ensuring stable power consumption of public facilities. In addition, the cable can also be used for power control lines of supporting facilities such as municipal drainage and heating.
Underground Power Distribution System in Industrial Parks
There are dense enterprises in industrial parks with large and concentrated power demand. The cable can be used as the underground power distribution trunk line of the industrial park to distribute power from the park substation to various factories. For factories with large production equipment, it can also be used as a power distribution branch line in the factory area to provide stable power for the equipment. The underground environment of industrial parks may contain oil, acid, alkali and other substances, and the corrosion - resistant sheath of the cable can adapt to this environment and ensure the safety of power transmission.
Power Distribution in Large Residential Communities
Large residential communities have a large power demand. The cable can be used as the underground power distribution trunk line of the community to connect the urban power grid and the community distribution room, and then the distribution room distributes power to each residential building. Its high current - carrying capacity can meet the power demand of a large number of residents in the community. The double steel tape armor and corrosion - resistant sheath can be used underground in the community for a long time, reducing maintenance costs.
(III) Material and Style
Conductor Material
The conductor is made of high - purity electrolytic copper with a purity of more than 99.95%. High - purity copper has excellent electrical conductivity, which can reduce energy loss during current transmission and improve power transmission efficiency. The copper conductor has a multi - strand stranded structure, which enhances the
Flexibility of the conductor, enables the cable to better adapt to terrain changes during underground laying, and also improves the fatigue resistance of the conductor, extending the service life of the cable.
Insulation Layer Material
The insulation layer is made of cross - linked polyethylene (XLPE) material. After cross - linking treatment, the material forms a three - dimensional network structure, with excellent insulation performance and temperature resistance. It can work stably for a long time under the voltage level of 0.6/1kV, and has a wide temperature resistance range, which can be used in the environment of - 40℃ to 90℃, adapting to the change of underground temperature. The XLPE insulation layer also has good chemical corrosion resistance and can resist the erosion of chemical substances in underground soil.
Armor Layer Material
The armor layer adopts a double steel tape structure. The steel tape is made of high - quality low - carbon steel with uniform thickness and high mechanical strength. The double steel tape armor can provide strong mechanical protection for the cable, resisting the pressure of underground soil, the impact of stones and the gnawing of insects and rodents. The surface of the steel tape is galvanized, which has a certain anti - rust ability and can extend the service life of the armor layer.
Sheath Layer Material
The outer sheath is made of polyethylene (PE) material, which has good corrosion resistance, aging resistance and water resistance. It can effectively isolate water vapor, acid, alkali and other substances underground, protecting the internal structure of the cable from erosion. The surface of the PE sheath is smooth, which can reduce friction with the soil during laying and facilitate the dragging and installation of the cable.
Style Design
The overall cable is round with a compact structure. The
4 Cores are arranged in order, and the outer layer is wrapped with an insulation layer, a double steel tape armor layer and a sheath layer in turn. The surface of the cable is printed with clear marks, including model, specification, rated voltage, manufacturer and other information, which is convenient for identification and selection. Its black sheath appearance can blend with the underground environment and has a certain ultraviolet resistance, so it can be used for a long time in shallow buried environments.
(IV) Production Process
Conductor Stranding
First, the high - purity electrolytic copper is inspected to ensure that its purity and performance meet the requirements. The copper material is drawn into
Copper Wires of specified diameter. During the wire drawing process, the wire drawing speed and die precision are strictly controlled to ensure uniform diameter of the copper wires. Then, according to a specific stranding process, multiple copper wires are stranded to form conductors of 150sqmm and 95sqmm. A regular stranding method is adopted during stranding to ensure that the copper wires are arranged closely with uniform tension, and the stranding pitch is controlled within a reasonable range to ensure the conductivity and flexibility of the conductor. After stranding, the conductor is subjected to surface cleaning treatment.
Insulation Layer Extrusion
The XLPE
Insulation Material is pretreated to remove moisture and impurities. The treated material is sent to the extruder and melted and plasticized at high temperature. The molten XLPE material is evenly coated on the surface of the copper conductor through an extrusion die to form an insulation layer. During the extrusion process, the extrusion temperature, pressure and speed are accurately controlled to ensure that the insulation layer has a uniform thickness, is closely combined with the conductor, and has no defects such as bubbles and pinholes. After that, the insulation layer is cross - linked to make the XLPE molecules form a stable three - dimensional network structure, enhancing its temperature resistance and mechanical strength.
Cabling
Three 150sqmm main wires and one 95sqmm ground wire covered with insulation layers are cabled in a certain order. A cabling machine is used for cabling to ensure that each core wire is in a stable position with uniform tension. To make the cable structure more round, appropriate filling materials are filled between the core wires, and the filling materials have certain flexibility and insulation. After cabling, the cable core is wrapped and fixed with wrapping tape to prevent the core wires from loosening.
Double Steel Tape Armoring
The cabled core enters the armoring process, and two steel tapes are wrapped around the core in a spiral way through an armoring machine to form a double steel tape armor layer. During the wrapping process, the tension and wrapping angle of the steel tape are controlled to ensure that the armor layer is tight and uniform without wrinkles, fractures and other conditions. The overlapping rate of the armor layer is not less than 15% to ensure the armoring effect.
Sheath Extrusion
The PE sheath material is dried to remove moisture from the material. The treated material is added to the extruder and melted at high temperature. The molten PE material is evenly coated on the armor layer through an extrusion die to form a sheath layer. The extrusion process parameters are controlled to ensure that the sheath layer has a uniform thickness, a smooth surface and is closely combined with the armor layer. After extrusion, the cable is cooled and shaped.
Finished Product Inspection
Finished cables need to undergo strict inspection. The appearance inspection checks whether the sheath surface is smooth, whether there is damage, whether the armor layer is flat and whether the marks are clear; the size measurement includes conductor diameter, insulation layer thickness, armor layer thickness, sheath thickness and cable outer diameter, etc.; the electrical performance test covers insulation resistance test, voltage withstand test, etc.; the mechanical performance test includes compression and tensile tests, etc.; in addition, corrosion resistance, aging resistance and other performance tests are also required to ensure that the cable quality meets the requirements.
II. General Product Information
(I) Packaging
Packaging Materials
The cable is packaged with a steel cable reel. The steel cable reel has high strength and strong bearing capacity, which can bear the weight of the cable and the pressure during transportation, and is suitable for long - distance transportation and large - quantity storage. The thickness of the side plate of the cable reel is not less than 12mm to ensure its stability.
After the cable is wound on the cable reel, it is wrapped with a plastic film as a whole. The plastic film can prevent moisture and dust and protect the cable surface from pollution. For exported or long - term stored cables, a layer of linen cloth is wrapped outside the plastic film to further enhance the protection effect and prevent the cable from being worn during transportation and storage.
Packaging Methods
When packaging, the cable is neatly wound on the steel cable reel, and appropriate tension is maintained during winding to avoid loose or excessive stretching of the cable. After winding, the cable is tightly wrapped with a plastic film, and the film interface is sealed with tape.
A label is fixed on the side of the cable reel, which is marked with detailed information such as product model, specification, length, rated voltage, production batch number, production date, manufacturer's name, address and contact information. Warning signs such as "Up", "Do Not Invert" and "Handle with Care" are marked in obvious positions of the cable reel. For cable reels with large weight, lifting holes are also installed to facilitate loading and unloading.
(II) Transportation
Transportation Methods
Long - distance transportation (more than 1000 kilometers) usually adopts railway transportation or road freight. Railway transportation has good stability and is suitable for large - batch cable transportation; road freight has high flexibility and can directly reach the destination, which is suitable for medium - and short - distance and small - batch transportation. For exported cables, container shipping is adopted, which can reduce transportation costs.
Short - distance transportation (within 100 kilometers) can use small trucks, which is suitable for transporting cables from the warehouse to the construction site.
Transportation Precautions
Before transportation, the cable reel must be fixed on the transport vehicle with steel wire ropes, and there are no less than 2 fixed points to ensure that the cable reel does not shake or roll during transportation. When fixing, avoid direct contact between the steel wire rope and the cable, and a soft material can be padded at the contact point to prevent damage to the cable.
During transportation, avoid severe impact and vibration on the cable reel. The driving speed of the vehicle should not be too fast, especially on turning and bumpy sections. The transport vehicle should take rainproof measures and cover with a tarpaulin to prevent the cable from being wetted by rain.
It is strictly forbidden to mix the cable with flammable, explosive and corrosive goods to avoid pollution and damage to the cable. When loading and unloading cables, special hoisting equipment is used, and the hoisting point should be at the hoisting hole of the cable reel. Hoisting on the side of the cable reel is prohibited. Keep stable during loading and unloading to avoid tilting and collision of the cable reel.
(III) Shipment
Shipment Process
After the customer places an order, the customer service personnel will check the order information within 2 hours, including product model, specification, quantity, receiving address, contact information, etc. After confirmation, a delivery note is generated and sent to the warehouse.
After receiving the delivery note, the warehouse retrieves the corresponding cable from the inventory according to the order information, counts the quantity and conducts an appearance inspection to ensure that the cable packaging is intact and free of damage. After passing the inspection, the cable is transported to the shipping area.
The warehouse contacts the transport company to inform the goods information, transportation requirements and shipping time. When the transport vehicle arrives, the warehouse staff and the driver check the goods information together, go through the handover procedures, and assist the driver in loading the cable onto the vehicle. After loading, the warehouse staff fills in the waybill, indicating the relevant information of the goods. After shipment, the customer service personnel inform the customer of the waybill number, the contact information of the transport company and the estimated arrival time.
Shipment Time
When the inventory is sufficient, orders placed before 15:00 on the same day can be shipped on the same day, and orders placed after 15:00 will be shipped the next day. When the order quantity is large (more than 20 reels), it is necessary to sort out the inventory and conduct centralized scheduling, and the shipment time may be delayed by 1 working day.
Cables with customized lengths require additional cutting and packaging time, and are generally shipped within 2 - 3 working days after the order is confirmed. In case of special circumstances such as holidays and bad weather, the shipment time will be delayed, and the customer service personnel will communicate with the customer in advance.
(IV) Samples
Sample Provision
To allow customers to understand the product quality, the company provides sample services. Customers can apply for samples from sales personnel and specify the required model and specification. The length of the sample is generally 1 meter, provided free of charge. The material and process of the sample are the same as those of mass - produced products, which can truly reflect the product situation.
The express fee of the sample shall be borne by the customer, and the customer can choose to pay on delivery or in advance. For customers with large purchase intentions, the sample express fee can be reduced or exempted.
Sample Delivery
After the samples are prepared, they are packed in a sealed bag and put into a hard carton, and buffer materials are filled in the carton to prevent the samples from being damaged during transportation. The sample model, specification, company name and contact information are marked on the package.
Samples are sent by express, and express companies with good service and fast speed are selected. After the samples are sent, the sales personnel inform the customer of the express waybill number, and the customer can check the logistics status. Domestic samples are generally delivered within 3 - 5 working days, and 5 - 7 working days in remote areas.
(V) After - sales Service
Quality Assurance
The company provides a 36 - month warranty period for the cable, calculated from the date when the customer receives and accepts it. During the warranty period, if the cable fails due to its own quality problems (such as conductor breakage, insulation layer aging, armor layer damage and other non - human factors), the company will replace or repair it for the customer free of charge.
If the cable is damaged due to improper use by the customer (such as use beyond the rated voltage, wrong laying method, external impact, etc.), the company provides paid repair or replacement services, and the cost is charged according to the actual situation.
After - sales Service Process
If a customer finds a quality problem with the cable, he can feedback through customer service phone, online customer service, email and other channels. After receiving the feedback, the customer service personnel will record the customer information, product situation and problem description in detail.
The customer service personnel will submit the problem to the after - sales technical team within 24 hours, and the technical team will analyze and judge the problem. If it is initially judged to be a quality problem, the technical personnel will contact the customer to learn more about the situation and arrange for technical personnel to conduct on - site investigation if necessary.
For confirmed quality problems, the company will negotiate solutions with the customer and complete the replacement or repair within the agreed time. The replaced products will be shipped within 3 working days after the customer returns the faulty products and they pass the inspection. For non - quality problems, explain the reasons to the customer and provide solutions and cost estimates.
Technical Support
The company has a professional technical team to provide customers with technical support. When customers purchase, technical personnel can recommend appropriate cable models and specifications according to the customer's use scenarios, power load, etc.
If customers encounter problems during cable laying and installation (such as laying depth, joint treatment, etc.), they can consult technical personnel, who will provide professional guidance. The company's official website provides product manuals,
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