Comprehensive Details of 0.6/1kV Triplex Aerial Bundled (ABC) Overhead Cable with XLPE Insulation & Aluminium Conductor
I. From the Perspective of the Product Itself
(I) Specification Parameters
Voltage and Insulation Matching Specifications
The 0.6/1kV triplex aerial bundled (ABC) overhead cable strictly complies with low-voltage (LV) power distribution system standards, with a phase voltage of 0.6kV and a line voltage of 1kV. It is suitable for scenarios such as urban-rural LV distribution networks, rural power grids, and LV power supply in industrial parks. It can be directly connected to the front-end transmission link of 0.4kV LV power distribution systems without additional voltage conversion equipment. The thickness of its XLPE insulation layer is precisely designed based on the single-core cross-sectional area: small-specification cables (16mm²-50mm²) have an insulation thickness of 1.2mm-1.4mm, while large-specification cables (70mm²-120mm²) have a thickness of 1.4mm-1.6mm. This ensures stable insulation performance under rated voltage. The cable passes the insulation withstand voltage test specified in GB/T 12706.1-2020 and IEC 60502-1 standards, showing no breakdown when subjected to 1.8kV for 1 minute. The partial discharge quantity is ≤10pC (under 1.73 times the rated voltage), far lower than the 50pC required by the standards, effectively avoiding safety hazards such as leakage and short circuits caused by insulation failure.
The temperature resistance of the insulation layer also meets the standards, with a long-term allowable operating temperature of 90℃, enabling it to continuously carry full-load current in high-temperature summer environments (outdoor temperature ≥35℃); the withstand temperature during short circuits (within 5 seconds) does not exceed 250℃, which can resist high-temperature impacts caused by instantaneous large currents and reduce permanent faults. In addition, the dielectric loss tangent value of the insulation layer is ≤0.003 (at 100℃), and the insulation resistance is ≥10¹³Ω·cm, maintaining excellent insulation performance even in complex environments such as humidity and dust. After a 1000-hour damp heat test (40℃, 95% relative humidity), the insulation resistance retention rate is ≥80%, and the dielectric loss tangent value change rate is ≤20%, meeting the requirements for long-term outdoor overhead use.
2. Conductor and Structural Dimension Parameters
The conductor is made of 6061 aluminum alloy material, with an aluminum content of ≥99.7%, added with 0.5% magnesium and 0.3% silicon alloying elements. The single-core cross-sectional area covers 16mm²-120mm², and the conductor
Structure and Performance parameters of different specifications are designed differently: the 16mm² conductor is formed by bundling 37 aluminum alloy wires with a diameter of 0.75mm, with a stranding pitch of 10 times the conductor outer diameter (approximately 6mm), a tensile strength of ≥120MPa, and an elongation rate of ≥15%; the 50mm² conductor is formed by bundling 54 aluminum alloy wires with a diameter of 1.0mm, with a stranding pitch of 8mm and a tensile strength of ≥125MPa; the 120mm² conductor is formed by bundling 91 aluminum alloy wires with a diameter of 1.3mm, with a stranding pitch of 12mm and a tensile strength of ≥130MPa. It can withstand self-weight stretching during overhead installation (the 120mm² cable has a self-weight of approximately 2.5kg per meter, and the maximum tensile force is about 125N when the span is 50 meters) and wind impact (can resist the lateral tension generated by level 8 winds), avoiding conductor breakage.
The overall dimensions of the triplex bundled structure are strictly controlled: the 16mm² triplex cable (2 16mm² phase conductors + 1 8mm² neutral conductor) has an outer diameter of approximately 25mm after bundling, with a weight of about 0.8kg per meter; the 50mm² triplex cable (2 50mm² phase conductors + 1 25mm² neutral conductor) has an outer diameter of approximately 32mm and a weight of about 1.8kg per meter; the 120mm² triplex cable (2 120mm² phase conductors + 1 60mm² neutral conductor) has an outer diameter of approximately 40mm and a weight of about 2.5kg per meter. All are only 1/3 the weight of copper-
Core Cables of the same specification (the weight of copper-core cables of the same specification is approximately 2.4kg-7.5kg per meter), significantly reducing the load-bearing pressure on overhead poles (the load-bearing capacity of existing LV poles is ≥50kg, which can 架设 3-5 120mm²
ABC Cables at the same time). There is no need to reinforce the poles additionally, reducing project construction costs.
The mechanical performance parameters of the cable are also excellent, with a minimum bending radius of 12 times the cable outer diameter: the bending radius of 16mm² cable is ≥180mm, 50mm² is ≥384mm, and 120mm² is ≥480mm, which can flexibly adapt to the corners of
Overhead Lines (such as the line bending angle at road corners ≤90°), avoiding insulation layer cracking caused by excessive bending; the impact resistance performance is such that there is no insulation layer damage or conductor displacement under 10J impact energy (impact with a 1kg heavy hammer falling from a height of 1 meter), which can resist the impact of foreign objects (such as tree branches and birds) in overhead scenarios; after 1000 friction tests (load 5N, grinding wheel speed 1m/s), the wear depth of the insulation layer is ≤0.2mm, with no conductor exposure, adapting to slight friction with pole brackets and insulators during overhead installation.
3. Neutral Conductor and Customized Specifications
As an important part of the triplex structure, the cross-sectional area of the neutral conductor is usually 50%-100% of that of the phase conductors, which can be flexibly adjusted according to customer needs: in conventional scenarios, 16mm² phase conductors are matched with 8mm² neutral conductors (50%), 50mm² phase conductors with 25mm² neutral conductors (50%), and 120mm² phase conductors with 60mm² neutral conductors (50%), meeting the neutral conductor current requirements of general LV power distribution (the neutral conductor current is usually 1/3-1/2 of the phase conductor current); in three-phase unbalanced scenarios (such as residential electricity in urban villages with concentrated single-phase loads), the neutral conductor can be customized to have the same cross-sectional area as the phase conductors (such as 16mm² phase conductors + 16mm² neutral conductor), ensuring that the neutral conductor does not overheat and overload, and avoiding three-phase voltage imbalance caused by neutral conductor faults.
Some special scenarios also support sheath customization. Conventional products have no outer sheath (the bundled structure is directly exposed for overhead use). In high-pollution and strong UV areas (such as around chemical parks and plateau areas), weather-resistant polyolefin sheaths can be customized, with a sheath thickness of 0.8mm-1.0mm, added with 0.5% UV-resistant additive (UV-531 type) and 1.0% anti-aging agent (1010 type). After 168 hours of xenon lamp aging test, the sheath tensile strength retention rate is ≥85% and the elongation at break retention rate is ≥75%, which can resist strong UV radiation and chemical pollutant corrosion; in rainy and humid areas, waterproof sheaths can be customized, using neoprene rubber material with an IP67 waterproof rating. After soaking in 1-meter deep water for 24 hours, the insulation resistance is ≥100MΩ, avoiding insulation performance degradation caused by rainwater seeping into the insulation layer.
In addition, the color of phase conductors can be customized. Conventionally, black (phase conductors) + gray (neutral conductor) is used for easy line identification. It can also be customized to RAL color card colors (such as red and yellow phase conductors, blue neutral conductor) according to customer needs, adapting to the color specifications of distribution lines in different regions (such as some regions requiring phase conductors to be distinguished by red, yellow, and green colors), improving the convenience of line operation and maintenance.
(II) Characteristic Applications
Upgrade and Reconstruction of Urban-Rural LV Distribution Networks
In the upgrade of urban-rural LV distribution networks, this cable is an ideal alternative to traditional bare conductors and single-core Insulated Wires. Taking the reconstruction of the distribution network in an urban village as an example, the original lines used 120mm² bare conductors, which had the problem of short-circuit faults caused by foreign object lapping (such as kite strings and tree branches), with an average of 12 power outages per year and each outage lasting ≥6 hours. After reconstruction, 120mm² Triplex ABC Cables (2 120mm² phase conductors + 1 60mm² neutral conductor) were used. The bundled structure eliminates the exposed gaps between phase conductors, and foreign object lapping cannot form a short-circuit loop. The average number of annual power outages is reduced to less than 3, and the outage duration is shortened to less than 1 hour, with power supply reliability improved by 75%.
This cable is also suitable for the reconstruction of external power supply lines in old residential areas. The roads around the community are narrow (width ≤5 meters), and the original single-core insulated wires require separate neutral conductor poles, which occupy road space and affect the urban appearance. After using 50mm² triplex ABC cables, the phase conductors and neutral conductor are laid in an integrated bundled manner, eliminating the need for additional neutral conductor poles. The number of poles per kilometer is reduced by 5-8 (from 20 for traditional lines to less than 15), freeing up space on both sides of the road. At the same time, the lightweight design of the cable (1.8kg per meter) facilitates manual wire laying, and the construction period is shortened from 7 days to 3 days, reducing the impact on residents' travel.
In the construction of new urban area LV distribution networks, this cable can be used with intelligent power distribution equipment. For example, an optical fiber sensing unit can be integrated into the cable (customized service) to monitor cable temperature, current, and other parameters in real time, and realize fault early warning through a remote monitoring platform. For example, a new urban area uses 70mm² ABC cables with optical fiber sensing. When the line load exceeds 80%, the system automatically issues an early warning, and operation and maintenance personnel adjust the load distribution in a timely manner to avoid overloaded operation of the cable, further improving power supply stability.
2. Construction and Upgrade of Rural Power Grids
Overhead lines in rural areas are long (often crossing villages and field ridges, with a single line length ≥5km) and have complex environments (mostly farmland, woods, and hills). The weather resistance and low-cost advantages of this cable are particularly prominent. In the farmland power supply scenario in plain rural areas, the lines need to cross large areas of farmland (span 50-80 meters). Traditional bare conductors are easily corroded by crop dust and pesticide residues, and their insulation performance degrades quickly (service life is only 5-8 years). However, the XLPE insulation layer of this cable can resist the corrosion of pesticide residues (such as organophosphorus pesticides). Tests show that after soaking in a 10% pesticide solution for 72 hours, the insulation resistance has no significant change, and the service life can reach more than 20 years, reducing the frequency of line replacement.
The terrain in hilly rural areas is undulating, and the lines need to turn frequently (turning angle 30°-60°). The small bending radius advantage of this cable (such as the bending radius of 16mm² cable ≥180mm) can flexibly adapt to the terrain, avoiding insulation layer damage caused by excessive bending. At the same time, pole resources in rural areas are limited, and the lightweight design of this cable allows multiple lines to be erected on the same pole (such as 2 50mm² cables on one pole), meeting the power supply needs of different areas and reducing pole construction costs (the construction cost of each pole is about 5,000 yuan, and reducing the number of poles can save 20%-30% of the cost).
In rural photovoltaic poverty alleviation projects, this cable can be used as the LV output line of photovoltaic
Power Stations, connecting distributed photovoltaic panels and village-level inverters. The output current of photovoltaic power stations fluctuates greatly (affected by light). The XLPE insulation layer of this cable has excellent partial discharge resistance (partial discharge quantity ≤10pC), which can adapt to the electric field changes caused by current fluctuations and avoid insulation aging; the low resistivity of the
Aluminum Alloy Conductor (≤0.028264Ω·mm²/m) can reduce line loss and improve the transmission efficiency of photovoltaic power (loss per kilometer ≤5%), contributing to the utilization of clean energy in rural areas.
3. LV Overhead Lines in Industrial Parks
Small and medium-sized enterprises in industrial parks (such as food processing plants, light machinery factories, and electronics factories) have stable electricity loads (single-plant peak load ≤100kW), but there are current impacts caused by frequent equipment start-stop (such as motors and compressors). The aluminum alloy conductor of this cable has high tensile strength (≥120MPa), which can withstand the mechanical stress caused by current impacts and avoid conductor fatigue fracture; the temperature resistance of the XLPE insulation layer (long-term operating temperature 90℃) can adapt to the high temperature during full-load operation of equipment (the ambient temperature around the equipment ≥40℃ in summer, and the cable surface temperature ≤60℃), ensuring stable power supply of the line.
In the overhead scenario on both sides of roads in industrial parks, the lines need to maintain a safe distance (≥0.5m) from other pipelines (such as water supply pipes and gas pipes). The bundled structure of this cable has a small outer diameter (the outer diameter of 120mm² cable is only 40mm), occupying small space and facilitating coordinated layout with other pipelines; at the same time, some industrial parks have slight dust pollution (such as metal dust in machinery factories), and the XLPE insulation layer of the cable has a smooth surface (roughness ≤0.8μm), so dust is not easy to adhere, reducing the insulation performance degradation caused by dust accumulation and lowering the frequency of operation and maintenance cleaning (extended from once a quarter to once every six months for traditional lines).
For temporary power supply lines in industrial parks (such as factory expansion and equipment maintenance), this cable can be used as a temporary overhead line. Its lightweight design (such as the 16mm² cable weighing 0.8kg per meter) facilitates transportation and laying. 2-3 people can complete the erection of 100 meters of line manually, with a short construction period (completed within 1 day); it can be recycled and reused after temporary use (if the insulation layer is not damaged), reducing temporary power supply costs and avoiding waste caused by one-time use of traditional temporary lines (such as rubber-
Sheathed Cables).
(III) Material and Style
Detailed Explanation of Core Materials
The Conductor Material is 6061 aluminum alloy, using high-purity aluminum rods (aluminum content ≥99.7%) as raw materials. 0.5% magnesium element is added to improve tensile strength and corrosion resistance (magnesium can form an MgAl₂O₄ protective film to prevent aluminum oxidation), and 0.3% silicon element is added to improve casting and processing performance (silicon can refine grains and improve the wire drawing performance of aluminum alloy wires). The aluminum rods are made into aluminum alloy wires of different diameters through continuous wire drawing (wire drawing speed 6-8m/s) (0.75mm wire for 16mm² conductors, 1.3mm wire for 120mm² conductors). Imported wire drawing oil (model LD-200) is used during the wire drawing process to ensure the wire surface is smooth and free of burrs (surface roughness ≤0.8μm), avoiding piercing the insulation layer; the drawn aluminum alloy wires are annealed (annealing temperature 350℃-380℃, nitrogen protection) to eliminate wire drawing internal stress and improve Flexibility (the elongation rate is increased from 8% before annealing to more than 15%).
The
Insulation Material is high-quality XLPE (cross-linked polyethylene), using 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 melting point of HDPE after cross-linking is increased from 130℃ to above 200℃); the antioxidant delays the aging of the insulation layer and avoids molecular chain breakage caused by long-term high-temperature operation; the UV absorber absorbs UV energy and protects the insulation layer from outdoor UV radiation damage (UV absorption rate ≥90%). The dielectric loss tangent value of
the XLPE material is ≤0.003 (at 100℃), with an insulation resistance of ≥10¹³Ω·cm and a breakdown field strength of ≥20kV/mm. All performance indicators are superior to traditional
PVC Insulation Materials (PVC has a dielectric loss tangent value of ≤0.08 and an insulation resistance of ≥10¹²Ω·cm), making it more suitable for long-term outdoor overhead environments with high insulation stability requirements.
Customized sheath materials are selected based on scenario needs: Weather-resistant polyolefin sheaths use linear low-density polyethylene (LLDPE) as the base resin, added with 0.5% UV-resistant additive (UV-531), 1.0% anti-aging agent (1010), and 5% flame retardant (magnesium hydroxide + aluminum hydroxide composite system). The oxygen index is ≥32%, complying with the flame-retardant requirements of GB/T 18380.3-2008. In the vertical burning test, the flame spread height is ≤2.5m and the self-extinguishing time is ≤60 seconds, which can inhibit flame spread in case of line fire; Waterproof neoprene sheaths are based on chloroprene rubber, added with 1.5% vulcanizing agent (sulfur) and 1.0% accelerator (tetramethylthiuram disulfide). After vulcanization, the tensile strength is ≥18MPa, the elongation at break is ≥200%, and the waterproof rating reaches IP67. After soaking in 1-meter deep water for 24 hours, there is no significant drop in insulation resistance, effectively preventing rainwater from penetrating the insulation layer.
Style and Overhead Adaptation
According to different overhead scenarios, the product offers multiple optimized styles. For conventional urban-rural overhead scenarios, an "unsheathed bundled" style is adopted, where phase conductors and neutral conductors are directly bundled without an outer sheath. This reduces material usage and weight (0.2kg-0.3kg lighter per meter than sheathed styles), facilitating overhead installation. Meanwhile, the exposed bundled structure has excellent heat dissipation performance (natural heat dissipation coefficient ≥10W/(m·K)), which can effectively lower the cable operating temperature (5℃-8℃ lower than sheathed styles under full load), adapting to high-temperature summer environments.
For high-pollution and strong UV scenarios (e.g., around chemical parks, plateau areas), a "weather-resistant sheathed bundled" style is used. The outer layer is covered with a weather-resistant polyolefin sheath, which has a smooth surface and is added with UV-resistant additives. It can resist dust pollution and UV radiation, extending the cable service life from 20 years to over 25 years. Additionally, the sheath color can be customized (e.g., gray, black) to coordinate with the surrounding environment and improve urban appearance; For rainy and humid scenarios (e.g., southern rainy areas, near reservoirs/rivers), a "waterproof sheathed bundled" style is adopted. The neoprene sheath has excellent waterproof performance, preventing rainwater from seeping into the insulation layer and avoiding insulation failure caused by moisture, which is particularly suitable for areas with annual rainfall exceeding 1500mm.
For long-span overhead scenarios (span 80-100 meters, e.g., crossing rivers, valleys), a "reinforced conductor bundled" style is applied. The conductor uses more strands of fine aluminum alloy wires tightly stranded (e.g., 120mm² conductor is stranded with 127 wires of 1.1mm diameter instead of the conventional 91 wires), increasing tensile strength from 130MPa to 150MPa. At the same time, the stranding pitch is reduced to 8 times the conductor outer diameter (conventional 12 times), enhancing the structural stability of the conductor and avoiding deformation or breakage caused by self-weight stretching during long-span installation; Reinforced terminal joints can also be customized at both ends of the line (using copper-aluminum transition terminals with a contact resistance ≤50μΩ), improving the connection reliability with insulators and poles and reducing joint heating (joint temperature ≤ cable body temperature +5℃), avoiding overheating damage to the joint.
(IV) Production Process
Conductor Manufacturing Process
Conductor production starts with 6061 aluminum alloy rods (diameter 9.5mm). First, continuous wire drawing machines perform multi-pass wire drawing. The wire drawing machines adopt a frequency conversion speed control system, and the area reduction rate of each pass is controlled between 12% and 18% (adjusted according to wire diameter: 15% for 0.75mm wires, 12% for 1.3mm wires) to ensure uniform wire diameter (deviation ≤±0.01mm). The wire drawing speed is adjusted based on the wire diameter: 8m/s for 0.75mm wires and 6m/s for 1.3mm wires, avoiding overheating and oxidation of the aluminum alloy wires due to excessive speed. During the wire drawing process, imported wire drawing oil (model LD-200) is used for lubrication and cooling, with the oil temperature controlled at 30℃-40℃ to ensure a smooth wire surface (surface roughness ≤0.8μm) and prevent burrs from piercing the insulation layer.
After wire drawing, the aluminum alloy wires enter an annealing furnace for annealing treatment. The furnace uses a mesh-belt continuous annealing process with a nitrogen-protected atmosphere (nitrogen purity ≥99.99%, flow rate 5m³/h) to prevent oxidation of the aluminum alloy wires during annealing. The annealing temperature is controlled at 350℃-380℃ (350℃ for 0.75mm wires, 380℃ for 1.3mm wires), and the holding time is 30-45 minutes. This process eliminates internal stress generated during wire drawing, reduces the tensile strength of the aluminum alloy wires to 120MPa-130MPa, and increases the elongation rate from 8% (before annealing) to more than 15%, improving the flexibility of the conductor and facilitating subsequent bundling.
The annealed aluminum alloy wires are then sent to a bunching machine for bundling into single-core conductors. For 16mm² conductors, 37 strands of 0.75mm aluminum alloy wires are bundled at a bunching speed of 8r/s; for 50mm² conductors, 54 strands of 1.0mm wires are bundled at 6r/s; for 120mm² conductors, 91 strands of 1.3mm wires are bundled at 4r/s. During the bundling process, a tension control system (tension deviation ≤5%) is used to ensure uniform tension of each strand, preventing conductor eccentricity (eccentricity ≤5%). After bundling, the single-core conductors are inspected for roundness (roundness ≥90%) using a laser diameter gauge; unqualified conductors are returned for re-bundling to ensure structural stability.
Insulation Extrusion Process
Insulation extrusion is performed using a single-screw extruder (screw length-diameter ratio 25:1) to coat the XLPE insulation layer on the surface of the single-core conductor. Before extrusion, the XLPE insulation compound (mixed with HDPE resin, DCP cross-linking agent, antioxidant, and UV absorber) is dried in a drying oven at 80℃ for 4 hours to reduce moisture content to ≤0.05%, avoiding bubble formation in the insulation layer during extrusion. The extruder uses zone-specific temperature control: the feeding section is 160℃-170℃, the compression section is 170℃-180℃, and the metering section is 180℃-190℃. This segmented temperature control prevents material degradation caused by overheating and ensures uniform melting and plasticization of the XLPE compound.
The molten XLPE material is extruded onto the conductor surface through a crosshead die. The die size is customized according to the conductor specification and insulation thickness: for 16mm²-50mm² conductors, a die with an inner diameter of 8mm-12mm is used to ensure an insulation thickness of 1.2mm-1.4mm; for 70mm²-120mm² conductors, a die with an inner diameter of 12mm-16mm is used to achieve an insulation thickness of 1.4mm-1.6mm. The insulation thickness deviation is controlled within ±0.1mm, and an online ultrasonic thickness gauge is used for real-time monitoring during extrusion; if the thickness exceeds the deviation range, the extruder speed is automatically adjusted to correct it.
After extrusion, the
Insulated Conductor enters a vertical cross-linking tube for high-pressure steam cross-linking. The cross-linking temperature is 230℃-240℃, the pressure is 1.8MPa-2.0MPa, and the cross-linking time is 15-20 minutes (15 minutes for 1.2mm-1.4mm insulation, 20 minutes for 1.4mm-1.6mm insulation). This process transforms the linear molecular structure of XLPE into a three-dimensional network structure, significantly improving its temperature resistance and mechanical strength. After cross-linking, the insulated conductor is cooled to room temperature using demineralized water (water temperature 20℃-25℃) to avoid insulation layer cracking caused by rapid cooling; the cooling speed is controlled at 3℃/s-5℃/s. Finally, the cooled insulated conductor is sent to a degassing tank (heated to 80℃) for 48 hours of degassing to remove residual cross-linking by-products (e.g., acetophenone), ensuring stable insulation performance during long-term operation.
Triplex Bundling and Quality Inspection Process
After degassing, the insulated conductors (2 phase conductors + 1 neutral conductor) are sent to a special triplex bundling machine for integrated bundling. The bundling machine uses a planetary stranding structure, with a bundling pitch of 100mm-150mm (adjusted according to cable specification: 100mm for 16mm² cables, 150mm for 120mm² cables) to ensure tight bonding between the three conductors without relative movement. During bundling, a semi-conductive water-blocking tape (overlap rate ≥20%) is wrapped around the bundled conductors (for sheathed styles) to enhance longitudinal water-blocking performance; no water-blocking tape is used for unsheathed styles to ensure heat dissipation.
For sheathed styles, after bundling, the conductors enter a sheath extruder (single-screw extruder with a length-diameter ratio of 28:1) for sheath extrusion. For weather-resistant polyolefin sheaths, the extrusion temperature is 165℃-190℃ (feeding section 165℃-175℃, compression section 175℃-185℃, metering section 185℃-190℃); for neoprene sheaths, a cold-feed extruder is used with an extrusion temperature of 90℃-110℃, and after extrusion, the sheath is vulcanized in a continuous vulcanization tube (160℃-180℃ for 10 minutes) to improve elasticity and wear resistance. The sheath thickness is controlled at 0.8mm-1.0mm, with a deviation ≤±0.1mm, and is monitored in real-time using an online thickness gauge.
After the cable is formed, it undergoes a comprehensive quality inspection, which runs through the entire production process:
Raw material inspection: Testing the chemical composition of aluminum alloy rods (using a spectral analyzer), the insulation resistance of XLPE compounds (≥10¹³Ω·cm), and the flame retardancy of sheath materials (oxygen index ≥32%).
Semi-finished product inspection: Conducting DC resistance testing on single-core conductors (Aluminum Alloy Conductors ≤0.028264Ω·mm²/m) using a double-arm bridge; testing the insulation breakdown voltage (≥18kV/1min) using a withstand voltage tester; and checking the insulation thickness deviation (≤±0.1mm) using an ultrasonic thickness gauge.
Finished product inspection:
Electrical performance tests: Measuring the partial discharge quantity (≤10pC under 1.73 times rated voltage) using a partial discharge analyzer; testing the insulation resistance of the entire cable (≥10¹³Ω·km); and verifying the grounding resistance (≤10Ω for cables with grounding structures).
Mechanical performance tests: Testing the tensile strength (≥120MPa) and elongation at break (≥15%) of the conductor using a universal testing machine; testing the impact resistance (10J impact energy, no insulation damage) using a drop weight impact tester; and conducting a bending test (bending radius 12 times the cable outer diameter, 10 cycles of bending, no insulation cracking).
Environmental performance tests: Conducting a damp heat aging test (1000 hours at 40℃, 95% relative humidity, insulation resistance retention ≥80%); a UV aging test (168 hours of xenon lamp irradiation, no sheath cracking); and an oil resistance test (soaked in No. 10 machine oil for 72 hours, sheath volume change ≤5%).
Only cables that pass all inspections are labeled with product information (model, specification, batch number, production date) using a laser coding machine. The labels are required to be clear and wear-resistant, with no fading after 100 rubs with a dry cloth. Finally, the qualified cables are wound onto cable drums (wooden drums for small batches, steel drums for large batches) and stored in a dry, well-ventilated warehouse (humidity ≤60%) to avoid moisture affecting insulation performance. Each batch of cables is accompanied by a quality inspection report, which records all test data for traceability in case of subsequent quality issues.
II. From the Perspective of Product General Information
(I) Packaging
Standard Packaging Solutions
Packaging is designed based on cable specifications, order quantity, and transportation distance to ensure product safety during storage and transportation:
Small-batch orders (≤500m, 16mm²-50mm²): Cables are wound onto wooden cable drums (diameter 1.0m-1.2m, width 0.6m-0.8m). The drum body is made of poplar plywood (15mm thick), reinforced with galvanized steel strips (20mm wide, 1.5mm thick) at the edges to prevent deformation. The cable is wound with a constant tension of 300N to avoid loosening, and a layer of kraft paper is placed between each layer of cable to reduce friction between cable layers. The drum surface is covered with a waterproof plastic film (thickness 0.12mm) to protect against moisture, and a label is affixed, indicating the cable model, specification, length, batch number, and storage instructions (e.g., "Avoid direct sunlight, store in a dry environment").
Large-batch orders (≥1000m, 70mm²-120mm²): Heavy-duty steel cable drums (diameter 1.5m-2.0m, width 1.0m-1.2m) are used. The drum is made of 3mm-5mm cold-rolled steel plates, with an anti-rust coating (zinc plating thickness ≥80μm) on the inner and outer surfaces to prevent rust during long-distance transportation or outdoor storage. The cable is wound with a tension of 500N, and a layer of foam rubber (5mm thick) is laid on the drum surface before winding to protect the cable sheath from scratches by 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.
Sample packaging (1-5m): Samples are coiled into circular coils (diameter 300mm-500mm) and wrapped with moisture-proof aluminum foil bags. Each sample is placed in a hard cardboard box (thickness 5mm) with foam inserts in the gaps to prevent collision damage during transportation. The box is labeled with "Sample" and the product specification, and a copy of the sample test report is enclosed.
Customized Packaging Services
The factory provides customized packaging services according to customer needs and regional characteristics:
High-altitude cold region packaging (e.g., Tibet, northern Xinjiang): Before winding the cable onto the drum, the cable surface is coated with anti-freeze oil (operating temperature -40℃ to 60℃) to prevent the sheath from cracking due to low temperatures. The drum is wrapped with thermal insulation cotton (thickness 50mm) and then covered with a waterproof cloth to avoid moisture absorption by the insulation cotton. This packaging can ensure that the cable remains intact even when transported in environments with temperatures as low as -30℃.
Export packaging: 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 "HT" or "MB" inside) to avoid customs detention in the destination country. For sea transportation, the outer surface of the drum is wrapped with a UV-resistant plastic film (UV resistance level UV3) to protect the drum from salt spray corrosion and sun exposure.
Construction-site-friendly packaging: For customers who need to install cables immediately after receipt, "pay-off drum" packaging is provided. The drum is equipped with a built-in bearing (rotational resistance ≤5N), allowing the cable to be unwound easily during installation without additional pay-off equipment. This reduces labor intensity by 30% and shortens the on-site construction time.
(II) Transportation
Transportation Mode Selection
The choice of transportation mode is determined by the customer’s location, order quantity, and delivery time requirements to balance efficiency and cost:
Road Transportation (≤500km, domestic): For short-distance and small-batch orders (≤500m, 16mm²-50mm²), medium-duty trucks (load capacity 10-15 tons) with air suspension systems are used. The air suspension reduces vibration during transportation, minimizing the risk of cable sheath damage caused by road bumps. This mode offers door-to-door delivery, with a transit time of 1-3 days, making it ideal for emergency maintenance projects (e.g., rural power grid repairs after storms). For example, customers in adjacent provinces can receive goods within 24 hours, ensuring timely power restoration.
Railway Transportation (>500km, domestic large batches): For long-distance and large-quantity orders (≥1000m, 70mm²-120mm²), railway freight is the preferred option. Gondola cars or covered wagons are selected, with a single wagon capable of loading 15-20 steel cable drums. Railway transportation has lower costs (20%-30% cheaper than road transport) and stable schedules, with a transit time of 3-7 days for major industrial zones (e.g., from North China to Southeast China). The factory coordinates with the railway department to reserve wagons 5-7 days in advance and arranges for dedicated personnel to supervise loading and unloading at railway stations.
Sea Transportation (export orders): For international customers, sea transportation is the main mode due to its large cargo capacity and low cost. 20-foot containers can hold 8-12 steel drums (120mm² cables), while 40-foot containers can accommodate 18-25 drums. The transit time varies by destination: 15-20 days for Southeast Asia, 30-40 days for Europe, and 45-55 days for North America. To protect against salt spray corrosion during sea transit, the outer surface of the steel drums is coated with an additional anti-rust layer (zinc plating thickness increased to ≥100μm), and desiccant bags (500g each) are placed inside the containers to control humidity ≤60%.
Air Transportation (urgent orders): For time-sensitive orders (e.g., urgent power supply for industrial park expansion), air freight is available. Cables are packaged in lightweight cartons (gross weight ≤30kg per carton) and shipped via cargo airlines. The transit time is 3-7 days globally, but costs are 8-10 times higher than sea transportation, so it is only used for small-batch urgent needs (≤100m).
Loading, Unloading, and In-Transit Protection
Loading and Unloading Specifications: Professional teams equipped with cranes or forklifts with soft nylon slings (width 50mm) handle loading and unloading to avoid scratching the drum surface or damaging the cable sheath. For wooden drums, the lifting point is strictly aligned with the drum’s central axis to prevent drum deformation; for steel drums, a dedicated lifting bracket is used to distribute weight evenly. The loading sequence follows the principle of “heavy at the bottom, light at the top”—large-specification cables (120mm²) are placed at the bottom, and small-specification ones (16mm²) on top. Gaps between drums are filled with foam boards (thickness 50mm) to prevent collision during transportation.
In-Transit Monitoring: For road and railway transportation, GPS trackers are installed on the vehicles/wagons to monitor real-time location, speed, and temperature. The speed is limited to ≤80km/h on highways and ≤60km/h on national roads to avoid excessive vibration. For sea transportation, the factory tracks the ship’s navigation status via the shipping company’s AIS system and receives daily updates on sea conditions. If abnormal conditions occur (e.g., container tilting, temperature exceeding 60℃), the logistics team is immediately notified to take corrective actions.
Emergency Response: In case of unexpected events (e.g., traffic accidents, port delays), the factory activates an emergency plan. For damaged cables, a replacement batch is produced within 24-48 hours; for delayed shipments, alternative transportation modes are arranged (e.g., switching from sea to air for urgent orders). The factory also compensates customers for losses caused by delays in accordance with the contract (e.g., 0.5% of the order value per day of delay, up to 5% of the total value).
(III) Shipping
Order Confirmation and Production Scheduling
After receiving the customer’s order, the sales department confirms all details (model, specification, quantity, delivery address, packaging requirements) in writing within 24 hours. Once the customer signs the contract, the production planning department formulates a detailed schedule based on the workshop’s current capacity. For standard specifications (e.g., 1000m 50mm² unsheathed ABC cables), the production cycle is 7-10 days, including raw material procurement (3 days), conductor manufacturing (2 days), insulation extrusion and bundling (2 days), and quality inspection (1-2 days). For customized orders (e.g., 120mm² waterproof sheathed cables with optical fiber integration), the cycle is extended to 12-15 days to account for custom die production and additional testing.
The procurement department ensures timely supply of raw materials—high-purity aluminum alloy rods are sourced from qualified suppliers with a lead time of 3 days, and XLPE insulation compounds are stocked in the warehouse to avoid delays. If raw material shortages are anticipated (e.g., due to market fluctuations), alternative suppliers are activated 5 days in advance to maintain production continuity.
Pre-Shipment Inspection and Documentation
A final pre-shipment inspection (PSI) is conducted by the quality control (QC) department 24 hours before dispatch. The inspection includes:
Dimensional verification: Measuring the cable’s outer diameter, insulation thickness, and conductor cross-sectional area using precision tools (e.g., digital calipers, laser diameter gauges).
Sampling tests: Testing 5% of the batch for electrical performance (insulation resistance, partial discharge) and mechanical performance (tensile strength, impact resistance) to ensure compliance with standards.
Only after all cables pass the PSI does the QC department issue a “Certificate of Conformity” (CoC), which includes test results, batch information, and compliance statements with GB/T 12706.1-2020 and IEC 60502-1. The logistics department then prepares the required documentation:
Shipment Notification and Delivery Follow-Up
The logistics department sends a shipment notification email to the customer 24 hours before dispatch, including:
For domestic deliveries, the team coordinates with the customer to confirm the delivery time and on-site conditions (e.g., availability of a crane for unloading steel drums). For export deliveries, the department assists with customs clearance by providing HS codes (73269090 for
Power Cables) and coordinating with the customer’s customs broker 3-5 days in advance.
After delivery, the sales department follows up with the customer within 3 days to confirm receipt and satisfaction. If the customer reports damage (e.g., drum deformation during transit), the sales team arranges for an inspection by the QC department within 48 hours and initiates a claim with the logistics provider. Replacement cables are shipped within 2 days to minimize disruption to the customer’s project.
(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 workshop prioritizes sample production: standard samples are completed within 3 days, while customized samples take 5 days. Sample production follows the same processes as bulk production (e.g., XLPE cross-linking, triplex bundling) to ensure consistency in performance. Each sample is accompanied by a “Sample Test Report” detailing electrical, mechanical, and environmental test results.
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. 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, lightweight design) and application case studies.
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 ≥5000m) and lead times. If modifications are requested, the workshop adjusts the production process and re-delivers the revised sample within 2 days, along with an updated test report.
(V) After-Sales Service
Technical Support
Pre-Installation Guidance: Before installation, the after-sales department sends a digital “Installation Manual” to the customer, which includes 3D diagrams of overhead installation steps (e.g., pole mounting, tensioning, terminal connection) and safety precautions. For example, the manual specifies that the cable’s minimum bending radius must not be exceeded during installation and that the terminal must be crimped with a 10-ton crimping tool for 50mm² conductors.
On-Site Support: For large-scale projects (≥10,000m), 2 senior engineers are dispatched to the site 1 week before installation. The engineers inspect the installation environment (e.g., checking pole load capacity, measuring span distances) and train the customer’s team on cable handling (e.g., proper unwinding speed to avoid conductor damage) and fault detection (e.g., using a megohmmeter to test insulation resistance). During installation, the engineers provide real-time guidance to resolve issues (e.g., adjusting cable tension to prevent sagging).
Remote Technical Assistance: For small-scale projects or urgent inquiries, the after-sales team offers 24/7 remote support via phone, email, or video call. The team can assist with troubleshooting (e.g., identifying the cause of insulation resistance drop) and provide solutions (e.g., cleaning the cable surface with alcohol to restore insulation performance).
Quality Complaint Handling
The factory adheres to a “24-hour response” policy for quality complaints. When a customer reports an issue (e.g., sheath cracking within the warranty period), the after-sales department records the details (order number, installation date, problem description) and assigns an engineer to investigate within 2 hours. The investigation includes:
If the problem is caused by product quality, the factory offers three solutions:
If the problem is caused by improper installation (e.g., exceeding the bending radius), the engineer provides corrective guidance and helps the customer adjust the installation to prevent further damage.
Maintenance and Warranty
Warranty Service: The cable comes with a 10-year warranty covering manufacturing defects (e.g., insulation failure, conductor breakage due to material defects). During the warranty period, any quality issues are resolved free of charge. For customers who purchase extended warranty (optional), the coverage is extended to 15 years, including maintenance and replacement services.
Spare Parts Supply
The factory maintains spare parts warehouses in major domestic and international locations (e.g., Shanghai, Guangzhou, Hamburg). The warehouses stock common spare parts such as cable terminals (copper-aluminum transition terminals for 16mm²-120mm² cables), insulation sleeves (heat-shrinkable sleeves resistant to 125℃), and sheath repair kits. Customers can order spare parts via the official website or after-sales hotline, with domestic delivery within 24 hours and international delivery within 3-5 days. For urgent needs, the factory offers express delivery to ensure minimal downtime.
In summary, the 0.6/1kV triplex ABC cable combines advanced materials, precision manufacturing, and comprehensive services to meet the diverse needs of urban-rural, rural, and industrial overhead power supply scenarios. Backed by strict quality control and customer-centric after-sales support, it provides a reliable, cost-effective solution for low-voltage overhead power distribution, contributing to improved power supply stability and reduced maintenance costs for customers worldwide.
English
Español
Portugues
Pусский
Français
العربية
Türk dili
Indonesia
Tiếng Việt
โทรศัพท์
จดหมาย