I. From the Perspective of the Product Itself
(I) Specification Parameters
Voltage and Insulation Matching Specifications
The 10kV XLPE
Insulated ABC Cable strictly complies with medium-voltage (MV) power distribution system standards, with a phase voltage of 10kV and a line voltage of 17.32kV. It is suitable for MV power supply scenarios such as urban-rural distribution networks and small-to-medium industrial parks. The thickness of its XLPE insulation layer is precisely designed to range from 3.4mm to 4.0mm: small-specification cables (25mm²-70mm²) have an insulation thickness of 3.4mm, while large-specification cables (120mm²-240mm²) have a thickness of 4.0mm. This ensures stable insulation performance under rated voltage. The cable passes the insulation withstand voltage test specified in IEC 60502-2, showing no breakdown when subjected to 18kV for 1 minute. The partial discharge quantity is ≤10pC (under 1.73 times the rated voltage), far lower than the 50pC required by the standard, effectively preventing power supply failures caused by insulation failure.
The 33kV XLPE insulated ABC cable covers a phase voltage of 33kV and a line voltage of 57.16kV, mainly used in high-voltage power supply scenarios such as large industrial parks and outgoing lines of regional substations. The insulation thickness is designed differently according to specifications: 6.0mm for 70mm²-120mm² cables and 7.0mm for 150mm²-240mm² cables. The insulation layer adopts a three-layer co-extrusion process (inner semi-conductive layer + insulation layer + outer semi-conductive layer). The inner semi-conductive layer eliminates electric field concentration on the conductor surface, and the outer semi-conductive layer closely combines with the sheath, further improving insulation reliability. This specification of cable shows no breakdown when subjected to 36kV for 1 minute, with a dielectric loss tangent value of ≤0.003 (at 100℃), enabling stable long-term operation under high voltage.
2. Conductor Specifications and Current-Carrying Capacity
Conductors are available in high-purity
Copper Core and aluminum alloy core, both covering a cross-sectional area range of 25mm²-240mm². Their current-carrying capacities have been certified in accordance with IEC standards. For copper-
Core Cables, the 25mm² copper-core cable has a current-carrying capacity of 110A when laid in air and 125A when laid in soil at 25℃, suitable for branch lines in urban-rural distribution networks, such as centralized power supply for residents in urban villages (covering 500-800 households per line); the 70mm² copper-core cable has a current-carrying capacity of 220A in air and 250A in soil, which can be used as the main line in small-to-medium industrial parks to supply power to 10-15 small-to-medium enterprises (such as electronics factories and machinery factories) in the park.
The 120mm² copper-core cable has a current-carrying capacity of 320A in air and 360A in soil, suitable for MV main lines in large industrial parks, connecting the park substation to the distribution rooms of various branch factories; the 240mm² copper-core cable has a current-carrying capacity of 480A in air and 530A in soil, which can be used as the outgoing cable of regional substations, covering multiple surrounding industrial parks or large communities (with a population of 10,000-20,000). The current-carrying capacity of aluminum alloy core cables is approximately 80% of that of copper-core cables of the same specification: the 25mm² aluminum alloy core cable has a current-carrying capacity of 88A in air and 100A in soil; the 120mm² aluminum alloy core cable has 256A in air and 288A in soil. Although its current-carrying capacity is slightly lower, its weight is only 1/3 of that of copper cores, and its cost is 30%-40% lower, making it suitable for cost-sensitive scenarios with long laying distances (such as cross-village and cross-town lines), such as power transmission lines in remote rural areas.
In addition, the conductor structure is optimized based on cross-sectional area: 25mm²-70mm² conductors adopt a bunched structure (multiple strands of fine copper/aluminum alloy wires bundled together), with 37-61 strands and a strand diameter of 0.8mm-1.2mm. They have good
Flexibility, with a bending radius of ≤12 times the cable outer diameter, suitable for span laying between utility poles (conventional span: 50-80 meters); 120mm²-240mm² conductors use a regular stranding structure, with 91-127 strands and a strand diameter of 1.2mm-1.6mm. The conductor roundness is ≥90%, reducing insulation thickness deviation, while improving the tensile strength of the conductor (tensile strength ≥200MPa for copper cores and ≥120MPa for aluminum alloy cores), adapting to self-weight stretching during long-span laying (80-120 meters).
3. Core Count and Sheath Specifications
The product offers four core count options: 2-core (1 phase + 1 neutral), 3-core (3 phases), 4-core (3 phases + 1 neutral), and 5-core (3 phases + 1 neutral + 1 grounding), to meet different power supply requirements. 2-core cables are mainly used in single-phase MV power supply scenarios, such as irrigation pumping stations in rural areas (power ≤50kW); 3-core cables are suitable for three-phase three-wire MV power distribution systems, such as power supply for high-voltage motors (power ≥100kW) in industrial parks; 4-core cables adopt a "3+1" structure (3 phase wires + 1 neutral wire), with the cross-sectional area of the neutral wire being 50%-100% of that of the phase wires, suitable for three-phase four-wire power distribution systems, such as mixed load power supply in urban-rural fringe areas (residential electricity + small commercial electricity); 5-core cables use a "3+1+1" structure (3 phase wires + 1 neutral wire + 1
Grounding Wire), with the grounding wire made of soft
Copper Wire braiding (braiding density ≥90%), eliminating the need for additional grounding wire laying, and are applicable to scenarios with high safety grounding requirements, such as distribution network lines around schools and hospitals.
The sheath layer is made of weather-resistant polyolefin material, with thickness designed according to scenario needs: for conventional aerial laying scenarios, the sheath thickness is 1.8mm-2.2mm (1.8mm for 25mm²-
70mm² Cables and 2.2mm for 120mm²-240mm² cables); for special weather-resistant scenarios (such as high-altitude and strong UV areas), thickened sheaths are used, with a thickness of 2.5mm-3.0mm, added with additional UV-resistant additives (UV-531 type, addition amount 0.5%). After 168 hours of xenon lamp aging test, the tensile strength retention rate is ≥85% and the elongation at break retention rate is ≥75%, far exceeding the performance of conventional sheaths. The sheath color offers two conventional options: black and gray, and can be customized to RAL color card colors (such as RAL 7035 light gray and RAL 9005 black) according to customer needs, facilitating line identification and environmental adaptation.
(II) Characteristic Applications
Upgrade and Reconstruction of Urban-Rural Distribution Networks
In the upgrade of urban-rural distribution networks, the 10kV XLPE insulated ABC cable is an ideal alternative to traditional bare conductors. In the distribution networks of old urban areas, traditional bare conductors have problems of messy lines and vulnerability to foreign object interference (such as tree branches and kite strings), often causing short-circuit faults and frequent power outages. The reconstruction using 10kV 70mm² 4-core ABC cables (3 phases + 1 neutral) integrates phase wires and neutral wires into the same sheath, eliminating exposed gaps, which can reduce the instantaneous fault outage rate of the line by more than 60%. For example, in a reconstruction project of an urban village, after laying
10kv ABC Cables, the annual number of power outages decreased from 15 before reconstruction to less than 5, and the average power outage duration was shortened from 8 hours to 2 hours per time, significantly improving the reliability of residents' electricity use.
The distribution network lines in rural areas are long, with scattered loads and complex terrain (such as hills and mountains). The use of 10kV 25mm²-50mm² aluminum alloy core ABC cables can reduce line procurement and laying costs. The lightweight design of the cable (60% lighter per meter than copper cores) eliminates the need for heavy hoisting equipment, and laying can be completed by manual cooperation with small pay-off racks, adapting to scenarios in rural areas where roads are narrow and large equipment is difficult to access. At the same time, the cable has excellent low-temperature resistance (no cracking of the insulation layer in a -40℃ environment), which can cope with severe cold in northern rural areas in winter, reduce line icing faults caused by ice and snow coverage, and ensure winter heating electricity demand.
2. Power Supply Systems in Industrial Parks
Large industrial parks have concentrated enterprises and large electricity loads (such as machinery manufacturing, chemical industry, electronics, and other industries), with strict requirements for power supply stability and anti-interference performance. The 33kV XLPE insulated ABC cable can be used as the MV main line in the park, connecting the regional substation to the park's main distribution room. Taking a machinery manufacturing park as an example, there are 20 enterprises in the park with a total electricity load of approximately 200MW. The use of 33kV 240mm² 3-core ABC cables as the main line meets the peak load demand of the park, and the low dielectric loss characteristic of the cable (dielectric loss tangent value ≤0.003) can reduce power loss, saving approximately 100,000 kWh of electricity annually.
In small-to-medium industrial parks (such as electronic industrial parks), the electrical equipment of enterprises is mostly precision instruments, with high requirements for power supply quality. The 10kV 120mm² 4-core ABC cable (3 phases + 1 neutral) can be used as a branch line in the park to supply power to individual enterprises. The XLPE insulation layer of the cable has strong anti-interference performance, which can resist electromagnetic interference generated by high-frequency equipment (such as frequency converters and high-frequency welding machines) in the park, avoiding voltage fluctuations affecting the operation of precision instruments. In addition, the flame-retardant performance of the cable sheath (oxygen index ≥32%, complying with IEC 60332-1 standard) is particularly important in industrial parks. In case of an electrical fire, the sheath can inhibit flame spread, preventing the fire from expanding and affecting the power supply of the entire park.
3. Power Transmission in Remote Areas
Remote mountainous and plateau areas have complex terrain and harsh climates, making the laying of traditional
Overhead Lines difficult and maintenance costs high. The lightweight and weather-resistant design of the 10kV XLPE insulated ABC cable can be effectively adapted to these areas. In mountainous power transmission, lines need to cross valleys and steep slopes. The use of 10kV 70mm²-120mm² copper-core ABC cables, with high tensile strength (tensile strength of copper core conductors ≥200MPa), can adapt to long-span laying of 80-120 meters, reducing the number of utility poles (from 15 poles per kilometer to 10 poles for traditional lines), and lowering construction difficulty and costs.
Plateau areas have strong UV radiation and large day-night temperature differences (-30℃-60℃). The cable sheath is added with UV-resistant additives and anti-aging agents. Tests have shown that after long-term use (5 years) in plateau environments, the sheath has no cracking or fading, and the insulation performance has no obvious attenuation; at the same time, the cold resistance of the cable can cope with low temperatures in winter, avoiding damage caused by the insulation layer becoming hard and brittle due to low temperatures. For example, in a power construction project in a plateau pastoral area, after using 10kV 50mm² ABC cables, the power supply reliability of herders' settlements increased from 70% before reconstruction to 98%, solving the problems of winter heating and electricity use for animal husbandry machinery.
(III) Material and Style
Detailed Explanation of Core Materials
In terms of
Insulation Materials, the
XLPE Insulation Material uses high-density polyethylene (HDPE) as the base resin, added with 2.0%-2.5% dicumyl peroxide (DCP) cross-linking agent, 0.5% antioxidant (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1010), and 0.3% UV absorber (2-hydroxy-4-methoxybenzophenone, UV-9). The cross-linking agent decomposes to generate free radicals at high temperatures, causing polyethylene molecules to form a three-dimensional network structure, improving the temperature resistance and mechanical strength of the insulation layer; the antioxidant delays the aging of the insulation layer, ensuring long-term operation stability; the UV absorber protects the insulation layer from UV radiation damage, adapting to aerial laying scenarios. The dielectric loss tangent value of the XLPE material is ≤0.003 (at 100℃), the insulation resistance is ≥10¹⁴Ω·cm, and the breakdown field strength is ≥20kV/mm, with all performance indicators superior to traditional
PVC Insulation Materials.
In terms of
Conductor Materials, the copper core uses high-purity electrolytic copper rods (copper content ≥99.95%) with a resistivity of ≤0.017241Ω·mm²/m (at 20℃), complying with IEC 61089 standard. The copper rods are made into conductors through multiple processes such as wire drawing (wire drawing speed 8-12m/s), annealing (annealing temperature 380℃-420℃, nitrogen protection), and stranding. Imported wire drawing oil (model LD-200) is used during the wire drawing process to ensure the copper wire surface is smooth and free of burrs (surface roughness ≤0.8μm); annealing treatment eliminates internal stress generated during wire drawing, with the elongation rate of soft
Copper Conductors ≥30% and that of hard
Copper Conductors ≥15%, adapting to different laying needs.
The aluminum alloy core uses 6061 aluminum alloy rods (aluminum content ≥99.7%, added with 0.5% magnesium and 0.3% silicon) with a resistivity of ≤0.028264Ω·mm²/m (at 20℃). Its mechanical strength is 40% higher than that of pure aluminum (tensile strength ≥120MPa), and it shows no obvious corrosion in the neutral salt spray test (5% sodium chloride solution for 480 hours). The aluminum alloy rods are made into conductors through wire drawing (wire drawing speed 6-8m/s), annealing (annealing temperature 350℃-380℃), and stranding processes. The surface of the drawn
Aluminum Wires is coated with a layer of conductive paste to reduce the contact resistance between the
Aluminum Wires and terminals, avoiding heating hazards.
The sheath material uses weather-resistant polyolefin material, with linear low-density polyethylene (LLDPE) as the base resin, added with 1.0% antioxidant (type 1010), 0.8% UV absorber (type UV-531), and 5% flame retardant (magnesium hydroxide + aluminum hydroxide composite system). The oxygen index of this material is ≥32%, complying with the flame-retardant requirements of IEC 60332-1 standard. In the vertical burning test, the flame spread height is ≤2.5m and the self-extinguishing time is ≤60 seconds; in terms of weather resistance, after 168 hours of xenon lamp aging test, the tensile strength retention rate is ≥80% and the elongation at break retention rate is ≥70%; it has excellent low-temperature resistance, with no embrittlement in a -40℃ environment and an impact strength of ≥20kJ/m².
2. Style and Installation Adaptation
According to different aerial laying scenarios, the product offers multiple optimized styles. For conventional urban-rural distribution network laying scenarios, a "standard sheath + unarmored" style is adopted, with a sheath thickness of 1.8mm-2.2mm and light weight (approximately 0.8kg per meter for 25mm² copper-core cables and 0.5kg for aluminum alloy core cables), facilitating manual pay-off and suitable for span laying between utility poles with a span of 50-80 meters; for high-altitude and strong UV areas (such as the Qinghai-Tibet Plateau and northwest deserts), a "thickened weather-resistant sheath + UV-resistant coating" style is used, with a sheath thickness of 2.5mm-3.0mm and a 0.1mm-thick UV-resistant coating (containing nano-titanium dioxide) on the surface, with a UV blocking rate of ≥95%, delaying sheath aging and adapting to long-term outdoor exposure scenarios.
For long-span laying scenarios (such as crossing rivers and valleys with a span of 80-120 meters), a "reinforced conductor + tensile sheath" style is adopted. The conductor is made of multiple strands of fine copper/aluminum alloy wires tightly stranded (stranding pitch reduced to 8-10 times the outer diameter) to improve tensile strength (tensile strength ≥250MPa for copper-core conductors and ≥150MPa for aluminum alloy-core conductors); the sheath is added with 0.5% glass fiber reinforcement material, which increases tensile strength by 30%, avoiding structural damage caused by self-weight stretching of the cable during long-span laying.
For laying scenarios in complex environments within industrial parks (such as near workshops with mechanical vibration), a "flame-retardant sheath + shielding layer" style is used. The flame-retardant grade of the sheath is upgraded to an oxygen index ≥35%, and a layer of copper wire braided shielding layer (shielding coverage ≥90%) is added inside the sheath to reduce electromagnetic interference generated by high-frequency equipment in the industrial park and ensure power supply stability; for areas with oil pollution (such as around machinery factories and chemical plants), the sheath is added with 1.0% oil-resistant agent (polybutadiene), and its oil resistance reaches a volume change rate ≤5% and hardness change ≤10 Shore A after soaking in No. 10 machine oil for 72 hours.
(IV) Production Process
Insulation Extrusion Process
For 10kV XLPE insulated ABC cables, a single-screw extruder (screw length-diameter ratio 25:1) is used for insulation extrusion. The XLPE insulation compound (mixed with HDPE resin, DCP cross-linking agent, antioxidant, and UV absorber) is added to the extruder hopper and heated to 180℃-195℃ for melting and plasticization. The melting temperature is controlled in sections: the feeding section is 180℃-185℃, the compression section is 185℃-190℃, and the metering section is 190℃-195℃ to avoid material degradation. The molten XLPE material is extruded onto the conductor surface through a crosshead die. The die size is designed according to the conductor specification and insulation thickness, ensuring uniform insulation thickness (deviation ≤±0.1mm). After extrusion, the
Insulated Conductor enters a vertical cross-linking tube for high-pressure steam cross-linking, operating at 230℃-240℃ and 1.8MPa-2.0MPa for 15-20 minutes (15 minutes for 3.4mm insulation, 20 minutes for 4.0mm insulation). After cross-linking, the conductor is cooled to room temperature with demineralized water and then sent to a degassing tank (80℃ for 48 hours) to remove residual cross-linking by-products.
For 33kV XLPE insulated ABC cables, a three-layer co-extrusion production line is used to simultaneously extrude the inner semi-conductive layer, XLPE insulation layer, and outer semi-conductive layer. The inner and outer semi-conductive compounds are made of polyethylene mixed with 25%-30% conductive carbon black, ensuring volume resistivity ≤100Ω·cm. The extrusion temperature of the three-layer co-extruder is precisely controlled: the inner semi-conductive layer is 180℃-190℃, the XLPE insulation layer is 185℃-195℃, and the outer semi-conductive layer is 180℃-190℃. The cross-linking process parameters are adjusted according to the insulation thickness: 25 minutes for 6.0mm insulation (70mm²-120mm² cables) and 30 minutes for 7.0mm insulation (150mm²-240mm² cables). After cross-linking and degassing, the insulated conductor undergoes a partial discharge test to ensure the partial discharge quantity ≤10pC.
Sheath Extrusion and Cable Forming Process
Sheath extrusion is performed after the insulated conductors (phase wires, neutral wire, grounding wire) are bundled. A twin-screw extruder (screw length-diameter ratio 28:1) is used for sheath extrusion, which ensures uniform mixing of the weather-resistant polyolefin compound (LLDPE resin + additives). The extrusion temperature is controlled at 165℃-190℃: the feeding section is 165℃-175℃, the compression section is 175℃-185℃, and the metering section is 185℃-190℃. The molten sheath material is extruded onto the bundled insulated conductors through a special multi-hole die, which ensures that the sheath tightly wraps each conductor without gaps. The sheath thickness is monitored in real-time by an online ultrasonic thickness gauge, with a deviation controlled within ±0.1mm.
After sheath extrusion, the cable enters a water cooling tank (water temperature 20℃-25℃) for rapid cooling and shaping, with a cooling speed of 3℃/s-5℃/s to avoid sheath cracking. The cooled cable is then sent to a laser coding machine to print product identification (model, specification, production date, batch number) on the sheath surface. The identification is required to be clear and wear-resistant, with no fading after 100 rubs with a dry cloth. Finally, the cable is wound onto a cable drum by a traction machine, with the winding tension controlled at 300N-500N (adjusted according to cable specification) to avoid cable deformation during winding.
Quality Inspection Process
Quality inspection runs through the entire production process to ensure compliance with IEC standards. Raw material inspection includes testing the chemical composition of copper/aluminum alloy rods (using a spectral analyzer), the insulation resistance of XLPE compounds (≥10¹⁴Ω·cm), and the flame retardancy of sheath materials (oxygen index ≥32%). Semi-finished product inspection covers:
Conductor inspection: DC resistance (copper core ≤0.017241Ω·mm²/m, aluminum alloy core ≤0.028264Ω·mm²/m) tested by a double-arm bridge, and conductor roundness (≥90%) measured by a laser diameter gauge.
Insulation inspection: Thickness (measured by an ultrasonic thickness gauge), dielectric loss tangent value (≤0.003 at 100℃) tested by a dielectric loss tester, and breakdown voltage (18kV/1min for 10kv Cables, 36kV/1min for 33KV Cables) tested by a withstand voltage tester.
Finished product inspection includes:
Mechanical performance tests: Tensile strength of the sheath (≥12MPa) and elongation at break (≥200%) tested by a universal testing machine, and impact resistance (10J impact energy, no sheath damage) tested by a drop weight impact tester.
Environmental performance tests: Damp heat aging (1000 hours at 40℃, 95% relative humidity, insulation resistance retention ≥80%), UV aging (168 hours of xenon lamp irradiation, no sheath cracking), and low-temperature flexibility (-40℃ for 4 hours, no cracking after bending).
All inspection data are recorded in a quality management system, and each batch of finished cables is accompanied by a quality inspection report for traceability. Only cables that pass all inspections are allowed to leave the factory.
II. From the Perspective of Product General Information
(I) Packaging
Standard Packaging Solutions
Packaging is designed based on cable specifications and transportation requirements to ensure product safety during storage and transportation. For small-specification cables (25mm²-70mm², length 500m-1000m), wooden cable drums (diameter 1.2m-1.5m, width 0.6m-0.8m) are used. The drum body is made of poplar plywood (18mm thick), reinforced with galvanized steel strips (30mm wide, 2mm thick) at the edges to prevent drum deformation. The cable is spirally wound on the drum with a constant tension (300N-400N), and a layer of kraft paper is placed between each layer of cable to reduce friction between cable layers and avoid sheath scratches. The drum surface is covered with a waterproof plastic film (thickness 0.15mm) to protect against moisture, and a label is affixed, indicating the cable model, specification, length, batch number, and production date.
For large-specification cables (120mm²-240mm², length 300m-800m), steel cable drums (diameter 1.8m-2.5m, width 1.0m-1.5m) are adopted. The drum is made of 3mm-5mm thick cold-rolled steel plates, with an anti-rust coating (zinc plating thickness ≥80μm) on the inner and outer surfaces to prevent rust during sea transportation or outdoor storage. The cable is wound with a tension of 500N-600N, and a layer of foam rubber (5mm thick) is laid on the drum surface before winding to protect the cable sheath from direct contact with the steel drum. The steel drum is equipped with two lifting lugs (made of 8mm thick steel plates) for easy loading and unloading, and the drum is sealed with waterproof tape to prevent water intrusion.
For small-batch samples or short-length cables (length ≤100m), carton packaging is used. The cartons are made of five-layer corrugated paper with a compressive strength of ≥1500N/m². The cables are first coiled into circular coils (with a diameter 3-5 times the cable outer diameter) and wrapped with moisture-proof plastic film, then placed in the cartons. The gaps in the cartons are filled with bubble film to prevent the cables from moving during transportation. Each carton is labeled with clear product information and a "fragile" warning sign.
Customized Packaging Services
The factory provides customized packaging services according to customer needs. For customers in high-altitude cold regions (such as northern Xinjiang, Tibet), the cable surface is coated with anti-freeze oil (operating temperature -40℃ to 60℃) before packaging, and the drum is wrapped with thermal insulation cotton (thickness 50mm) to prevent the cable sheath from cracking due to low temperatures during transportation. The thermal insulation cotton is fixed with waterproof cloth to avoid moisture absorption and loss of insulation effect.
For export customers, packaging complies with ISPM 15 (International Standards for Phytosanitary Measures No. 15). Wooden drums undergo heat treatment (heated to 56℃ for at least 30 minutes) or fumigation treatment (using methyl bromide) to eliminate pests and pathogens, and are marked with the ISPM 15 certification logo (a hexagon with the letters "HT" or "MB") to avoid customs detention in the destination country. In addition, the outer surface of the drum is wrapped with a layer of anti-ultraviolet plastic film (UV resistance level UV3) to protect the drum from sun and rain during sea transportation.
For customers who need to store cables outdoors for a long time, anti-aging packaging is provided. The cable drum is covered with a sunshade cloth (sunshade rate ≥95%) and fixed with ropes to prevent the cloth from being blown away by strong winds. The sunshade cloth is made of polyester fiber with anti-ultraviolet and waterproof functions, which can effectively extend the storage life of the cable (from 6 months to 12 months).
(II) Transportation
Transportation Mode Selection
The appropriate transportation mode is selected based on the customer's location, order quantity, and delivery time requirements. For domestic customers with a distance of ≤500km and a small order quantity (≤500m), road transportation is preferred. Light trucks (load capacity 5-10 tons) or medium trucks (load capacity 10-20 tons) with air suspension systems are used to reduce vibration during transportation and avoid cable damage. The transportation time is generally 1-3 days, and door-to-door delivery can be realized, which is suitable for emergency maintenance projects. For example, customers in the same province can receive the goods within 24 hours, ensuring the timeliness of power supply restoration.
For domestic customers with a distance of >500km and a large order quantity (≥1000m), railway transportation is selected. Railway freight cars (covered cars or gondola cars) are used, with a large transportation capacity (a single covered car can load 15-20 steel cable drums) and low transportation costs (20%-30% lower than road transportation). The transportation time is generally 3-7 days, which is suitable for large-scale urban-rural distribution network reconstruction projects. The factory coordinates with the railway department to book freight cars in advance and arranges for the loading and unloading of cable drums at the railway station.
For export customers, sea transportation is the main mode. 20-foot or 40-foot containers are used for shipping. A 20-foot container can load 8-12 steel cable drums (25mm²-70mm² specifications), and a 40-foot container can load 15-25 steel cable drums. The transportation cost is low (30%-50% lower than air transportation), and it can carry large quantities of goods. The transportation time depends on the destination port: 15-30 days for Southeast Asian countries, 30-45 days for European countries, and 45-60 days for North American countries. For urgent export orders (such as
Emergency Power Supply for overseas industrial parks), air transportation is provided. Air freight is used, with a transportation time of 3-7 days, but the cost is higher (5-10 times that of sea transportation), and it is only suitable for small-batch urgent orders (≤200m).
Loading and Unloading Specifications
Strict loading and unloading specifications are formulated to ensure the safety of cables during transportation. Before loading, the transportation vehicles, railway freight cars, or containers are inspected to ensure they are clean, dry, and free of sharp objects (such as nails, iron chips) that may scratch the cable sheath. For road transportation trucks, wooden pads (50mm thick) are laid on the truck bed to reduce the impact of road bumps on the cable drums.
When loading the cable drums, professional lifting equipment (cranes or forklifts) with soft lifting slings (nylon slings with a width of 50mm) is used to avoid damaging the drum surface. The lifting points are located at the two ends of the drum's central axis to ensure the drum is lifted horizontally and prevent tilting. The lifting speed is controlled at 0.5-1m/s to prevent the drum from swinging and colliding with other objects. When placing the drums in the transportation vehicles or containers, they are placed vertically (the drum heads are perpendicular to the ground), and the distance between adjacent drums is ≥10cm to facilitate heat dissipation and avoid mutual friction. For multiple layers of stacked drums (only allowed for steel drums), the number of layers is not more than 2, and a layer of rubber pads (10mm thick) is placed between the layers to reduce pressure on the lower drums.
When unloading, the same professional lifting equipment is used, and the unloading speed is controlled at 0.3-0.8m/s. It is strictly forbidden to roll the drums directly on the ground, as this may damage the drum structure and the cable sheath. After unloading, the drums are placed in a flat, dry, and well-ventilated area, and the distance between the drums and the ground is ≥10cm (using wooden blocks or steel brackets for support) to prevent the drums from getting damp.
Transportation Monitoring and Protection
A complete transportation monitoring system is established to track the entire transportation process in real time. For road transportation, GPS positioning devices are installed on the trucks, and the logistics management department can monitor the trucks' location, speed, and driving route through the logistics management platform. If the trucks deviate from the planned route, exceed the speed limit (highway speed limit ≤80km/h, national road speed limit ≤60km/h), or stop for an abnormal time (≥2 hours without reason), the system will send an alarm, and the logistics staff will contact the driver immediately to confirm the situation and handle it properly.
For railway transportation, the factory cooperates with the railway department to obtain the train's schedule, departure time, and arrival time in a timely manner, and updates the customer on the transportation progress every 24 hours. For sea transportation, the factory tracks the ship's navigation status through the ship's AIS (Automatic Identification System), understands the sea conditions and the estimated arrival time at the port, and notifies the customer of the bill of lading number and port of arrival 3-5 days in advance to facilitate customs clearance and pick-up.
During transportation, if unexpected situations occur (such as traffic accidents, natural disasters, or port delays), the factory will immediately formulate an emergency plan. For example, if a truck is involved in an accident and the cables are damaged, the factory will arrange for a backup truck and produce replacement cables within 24-48 hours to ensure the customer's project progress is not affected. If the ship is delayed due to bad weather, the factory will communicate with the customer in a timely manner, provide the latest transportation schedule, and compensate the customer for losses caused by the delay in accordance with the contract agreement.
(III) Shipping
Order Confirmation and Production Scheduling
After receiving the customer's order, the sales department first confirms the order details with the customer in writing (via email or contract), including cable model, specification (core count, cross-sectional area), length, quantity, delivery time, destination, and packaging requirements. This avoids misunderstandings caused by verbal communication. After the
customer confirms and signs the contract, the sales department submits the order to the production planning department within 24 hours. The production planning department formulates a detailed production schedule based on the order quantity, specification complexity, and current workshop capacity. For standard specifications (e.g., 10kV 70mm² 4-core ABC cables), the production cycle is 7-10 days, including raw material procurement (3 days), conductor manufacturing (2 days), insulation and sheath extrusion (2 days), and quality inspection (1-2 days). For custom specifications (e.g., 33kV 240mm² 5-core cables with thickened anti-UV sheaths), the product cycle is extended to 12-15 days to account for custom die manufacturing (3 days) and additional performance testing (2 days).
The production planning department also coordinates with the procurement department to ensure timely supply of raw materials. For example, high-purity copper rods (99.95% purity) are sourced from established suppliers (e.g., Jiangxi Copper) with a 3-day lead time, while XLPE insulation compounds (Borealis FB2310) are stocked in the factory warehouse to avoid delays. If raw material shortages are anticipated (e.g., due to market supply fluctuations), the procurement department initiates emergency sourcing from alternative suppliers 5 days in advance to maintain production continuity.
Pre-Shipment Inspection
Before shipment, a comprehensive pre-shipment inspection (PSI) is conducted by the quality control (QC) department to verify compliance with IEC standards and customer requirements. The inspection process includes:
Visual inspection: Checking the cable sheath for scratches, bubbles, or color inconsistencies; verifying the clarity and completeness of laser-printed identification (model, batch number, etc.).
Dimensional inspection: Measuring the cable outer diameter (tolerance ±0.5mm) and sheath thickness (tolerance ±0.1mm) using a digital caliper; confirming the conductor cross-sectional area meets specifications (e.g., 185mm² ±2%).eElectrical performance sampling: Testing 5% of the batch for insulation resistance (≥10¹⁴Ω·cm) and partial discharge (≤10pC at 1.73×rated voltage) using a high-voltage insulation tester and partial discharge analyzer.
If any non-conformities are identified (e.g., a sheath scratch exceeding 0.2mm depth), the QC department marks the affected cables for rework. For minor defects (e.g., shallow scratches), the sheath is repaired using heat-shrinkable sleeves; for major defects (e.g., insulation thicknss non-compliance), the cables are returned to the extrusion workshop for reprocessing. Only after all cables pass the PSI does the QC department issue a "Certificate of Conformity" (CoC), which includes test results, batch information, and IEC standard compliance statements.
Shipment Notification and Delivery Follow-Up
Once the CoC is issued, the logistics department sends a shipment notification email to the customer 24 hours before dispatch. The email includes:
Documentation: Scanned copies of the CoC, commercial invoice, packing list, and (for exports) certificate of origin (CO) and ISPM 15 fumigation certificate.
For domestic deliveries, the logistics department coordinates with the customer to confirm the delivery address and unloading conditions (e.g., availability of a crane for steel drums). If the customer requests a specific delivery time (e.g., weekends to avoid workshop downtime), the logistics department adjusts the transport schedule accordingly. For export deliveries, the department also assists with customs clearance by providing required documents (e.g., HS code 73269090 for
Power Cables) and coordinating with the customer’s customs broker 3 days in advance.
After delivery, the sales department follows up with the customer within 3 days to confirm receipt and satisfaction. The follow-up includes:
If damage is reported (e.g., a drum cracked during transit), the sales department initiates a claim with the logistics provider within 24 hours and arranges for replacement cables to be shipped within 48 hours. The damaged cables are inspected by the QC department to determine the cause of damage (e.g., improper loading) and implement preventive measures (e.g., adding additional padding for future shipments).
(IV) Samples
Sample Request and Production
The factory provides free samples (1-5m length) to customers for performance evaluation and project approval. To request a sample, customers submit a "Sample Request Form" specifying:
Upon receiving the form, the sales department confirms the details with the customer within 12 hours and forwards it to the sample workshop. The sample workshop prioritizes sample production, completing standard samples (e.g., 10kV 70mm² copper-core) within 3 days and custom samples (e.g., 33kV 185mm² anti-UV) within 5 days. Sample production follows the same process as bulk production, including XLPE cross-linking and sheath extrusion, to ensure consistency in performance.
Each sample is accompanied by a "Sample Test Report" detailing:
Sample Delivery and Feedback Collection
Samples are packaged in moisture-proof aluminum foil bags and placed in rigid cardboard boxes with foam inserts to prevent damage during transit. For domestic customers, samples are shipped via SF Express (delivery time 2-3 days); for international customers, DHL or FedEx is used (delivery time 5-7 days). The package also includes a product brochure highlighting key features (e.g., XLPE insulation advantages, IEC compliance) and application case studies (e.g., urban distribution network upgrades in Southeast Asia).
The sales department follows up with the customer 7 days after sample delivery to collect feedback. Feedback is documented in a "Sample Feedback Form," which includes:
If the customer approves the sample, the sales department provides a detailed quotation for bulk orders, including volume discounts (e.g., 2% discount for orders ≥10,000m) and lead times. If modifications are requested (e.g., increasing sheath thickness to 3.0mm), the sample workshop adjusts the production process and re-delivers the revised sample within 2 days, along with an updated test report comparing performance before and after modification.
(V) After-Sales Service
Technical Support
The factory offers comprehensive technical support to ensure proper installation, operation, and maintenance of the cables. Key services include:
Aerial installation: Specifying pole spacing (50-80m for 10kV cables), cable sag (≤0.5m), and hardware requirements (e.g., suspension clamps with rubber liners to prevent sheath damage).
Joint termination: Detailing the use of heat-shrinkable joints (e.g., 3M QS2000) for 10kV cables, including cleaning procedures (using isopropyl alcohol) and crimping force (12 tons for 185mm² conductors).
On-site technical assistance: Dispatching senior engineers to customer sites for large-scale projects (≥5,000m) or complex installations (e.g., long-span river crossings). Engineers arrive within 48 hours of a request and provide:
Pre-installation site inspection: Checking pole stability, conductor tension requirements, and environmental hazards (e.g., nearby high-voltage lines).
Installation training: Conducting hands-on training for the customer’s team on cable pulling (maximum tension 5kN) and joint termination, with a focus on safety protocols (e.g., wearing insulating gloves).
Warranty and Maintenance
The cables come with a 5-year warranty covering manufacturing defects (e.g., insulation breakdown due to poor extrusion) and performance failures (e.g., partial discharge exceeding 10pC within the warranty period). To claim the warranty, customers provide:
Upon receiving a warranty claim, the after-sales department investigates within 3 days. If the defect is confirmed to be manufacturing-related, the factory offers:
The factory also provides optional annual maintenance services for customers, including:
Complaint Handling and Continuous Improvement
Customer complaints are handled via a dedicated 24/7 after-sales hotline and email . The complaint handling process follows these steps:
Resolution: Proposing a solution to the customer within 3 days. Solutions include replacement, repair, or compensation (e.g., 10% discount on future orders for minor delays).
All complaints are analyzed quarterly by the quality assurance (QA) department to identify recurring issues and drive continuous improvement. For example, if multiple complaints about sheath cracking in cold regions are received, the QA department recommends modifying the sheath formula (adding 0.5% ethylene propylene rubber) to improve low-temperature flexibility. The modified formula is tested in the R&D laboratory (via -40℃ cold-bend tests) and implemented in production within 1 month, with the improvement documented in a "Corrective and Preventive Action" (CAPA) report.
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