Electrical performance: The volume resistivity of the insulation layer (usually cross-linked polyethylene XLPE) must be ≥1×10¹⁴Ω·m, the dielectric loss tangent value (tanδ) at 90°C must be ≤0.003, and after 1000 hours of thermal aging test, the insulation performance attenuation must not exceed 20%; the cable must pass the 1-hour partial discharge test at 1.73 times the rated voltage (about 57KV), and the partial discharge amount must be ≤10pC.

Mechanical performance: The bending radius of the cable must be ≥20 times the cable outer diameter (cold state) and 25 times the cable outer diameter (hot state) to adapt to complex environments such as underground direct burial and pipeline laying; after 1000 bending tests, there must be no cracks, fractures, or other damages to the conductor and insulation layer.

Environmental resistance performance: The cable must pass the -40°C low-temperature impact test (no cracks), 70°C high-temperature pressure test (insulation layer deformation ≤50%), and acid and alkali corrosion resistance test (after immersion in solutions with pH=2 and pH=12 for 72 hours, the performance has no significant changes), ensuring stable operation in harsh environments such as severe cold, high temperature, and chemical pollution.

"S2" usually represents the type of shielding layer structure, meaning that the cable adopts a double-layer shielding design. The inner layer is a semi-conductive shielding layer (thickness ≥0.8mm), which is used to evenly distribute the electric field and avoid breakdown caused by excessive local electric field strength in the insulation layer; the outer layer is a metal shielding layer (mostly copper tape or Copper Wire braiding) with a thickness of ≥0.15mm, which has both electric field shielding and fault current conduction functions, and its shielding effectiveness is ≥80dB (at 1MHz frequency).

"10" indicates the fire resistance level of the cable, that is, the cable can maintain normal power supply capacity for 10 minutes under the condition of a flame temperature of 950°C ~ 1000°C (in line with the "flame propagation and fire resistance" requirements in the EU EN 50200 standard), suitable for places with high requirements for power supply continuity (such as hospitals, data centers, subway tunnels).

Conductor: High-purity electrolytic copper (purity ≥99.95%) is used, made through continuous casting and rolling processes, with excellent electrical conductivity (conductivity ≥100% IACS) and mechanical strength (tensile strength ≥300MPa). The conductor has a circular compacted structure with a compaction coefficient ≥0.9, which can reduce the electric field concentration on the conductor surface and reduce the cable outer diameter to save laying space.

Insulation layer: Cross-linked polyethylene (XLPE) is selected, which is treated by a peroxide cross-linking process to transform the linear molecular structure into a three-dimensional network structure, with high temperature resistance (long-term operating temperature 90°C, short-term overload temperature 130°C), aging resistance, chemical corrosion resistance, and other characteristics. The thickness of the insulation layer is ≥8.5mm (meeting the requirements of 33KV voltage level), and it is produced by a three-layer co-extrusion process (conductor shielding + insulation + insulation shielding) to ensure that each layer is tightly combined without bubbles or impurities.

Shielding layer: The inner semi-conductive shielding layer is made of carbon black-filled polyethylene with a volume resistivity ≤100Ω·m, which can be closely attached to the conductor and insulation layer to eliminate interface air gaps; the outer metal shielding layer is made of annealed soft copper tape (thickness 0.15mm ~ 0.3mm), overlapped and wrapped (overlap rate ≥15%) or copper wire braided (braiding density ≥85%), with both shielding and conductive functions.

Sheath: High-density polyethylene (HDPE) or polyvinyl chloride (PVC) is used, selected according to the application scenario - HDPE sheath has excellent weather resistance and ultraviolet resistance, suitable for outdoor laying; PVC Sheath has good flame retardancy (oxygen index ≥30) and mechanical strength, suitable for indoor or tunnel laying. The sheath thickness is ≥2.5mm, and clear marks (model, specification, standard number, production batch number, etc.) are printed on the surface for easy identification and traceability.

Raw material screening: Electrolytic copper rods with a purity of ≥99.95% are selected, and the impurity content is detected by spectral analysis (such as the content of iron, lead, and other elements ≤0.005%) to ensure electrical conductivity.

Wire drawing and compaction: The copper rod is drawn into φ2.5mm copper wires by a continuous wire drawing machine, and then multiple copper wires are compacted into a circular conductor through a multi-head compaction die (60 ~ 80 dies). During the compaction process, an online annealing process (temperature 350°C ~ 400°C) is adopted to eliminate internal stress in the conductor and avoid cracking in subsequent processing.

Three-layer co-extrusion: Using an imported three-layer co-extrusion production line from Germany, the conductor shielding material (semi-conductive polyethylene), Insulation Material (XLPE), and insulation shielding material (semi-conductive polyethylene) are simultaneously extruded onto the conductor surface. The extrusion temperature is controlled at 120°C ~ 150°C, and the linear speed is 8m/min ~ 10m/min to ensure uniform thickness of each layer (deviation ≤±0.5mm).

Cross-linking and curing: The extruded cable enters the vulcanization pipe and completes the cross-linking reaction in a steam environment at 180°C and 1.8MPa (for about 15 minutes), making the XLPE molecules form a network structure, and then is shaped through a cooling pipe (water temperature 20°C ~ 30°C).

Shielding layer wrapping: An automatic wrapping machine is used to wrap the copper tape around the insulation shielding layer with an overlap rate of 15%. The wrapping tension is controlled at 50N ~ 80N to ensure that the copper tape is tightly attached without wrinkles.

Sheath extrusion: A φ150mm single-screw extruder is selected to melt HDPE or PVC materials at 160°C ~ 190°C and extrude them onto the shielding layer. The extrusion pressure is maintained at 10MPa ~ 15MPa, the outer diameter of the sheath is controlled by a vacuum sizing sleeve, and after cooling, the mark is printed by an inkjet printer.

Electrical performance: DC resistance test (conductor resistance ≤0.0741Ω/km), insulation resistance test (≥1000MΩ·km), power frequency withstand voltage test (applying 95KV voltage for 1 minute without breakdown).

Mechanical performance: Tensile test (sheath elongation at break ≥200%), bending test (no cracks after bending).

Appearance and size: The sheath surface is smooth without bubbles, and the outer diameter deviation is ≤±1mm.

The cable is wound on a steel cable reel (diameter 1.2m ~ 2.0m, selected according to length) in rolls of 100m or 200m. The cable reel is welded with Q235 steel, with a load-bearing capacity of ≥5 tons. The side is provided with reinforcing ribs to prevent deformation during transportation.

The outer layer of the cable is wrapped with 2 layers of waterproof kraft paper (thickness 0.15mm), and then 1 layer of PE stretch film (thickness 0.05mm) to ensure moisture-proof and dust-proof; both sides of the cable reel are covered with wooden boards (thickness 20mm), and the wooden boards and the steel reel are fixed by bolts to avoid wear of the cable ends.

Export orders can be packaged in fumigated wooden boxes according to customer requirements (in line with ISPM 15 standard). The thickness of the wooden box is ≥15mm, and the interior is filled with foam buffer materials to prevent the cable reel from colliding during sea transportation.

Small batches of samples (such as 10m segments) are packaged in cardboard tubes (diameter 100mm, length 1.1m), with plastic caps sealed at both ends, and covered with color packaging bags printed with product profiles.

Domestic transportation: Flatbed trucks or low-side trucks are used for transportation. A single truck can load 5 ~ 8 rolls (total weight ≤30 tons). The cable reels are fixed with steel wire ropes (tensile force ≥50kN), and rubber pads (thickness 10mm) are placed at the bottom of the reels to prevent sliding; the speed during transportation does not exceed 80km/h, and it is necessary to slow down to below 30km/h when passing through bumpy sections to avoid shaking of the cable reels.

International transportation: It is carried out by container sea transportation or air transportation. A 20-foot container can load 3 ~ 4 rolls (total length 600 ~ 800 meters), and a 40-foot container can load 8 ~ 10 rolls (total length 1600 ~ 2000 meters); air transportation is only applicable to samples, with each box weight ≤30kg, in line with air transportation safety standards (no flammable and explosive components).

Order confirmation: After the customer pays the advance payment (usually 30%), the factory arranges production, and the production cycle is 15-20 days (adjusted according to the order quantity).

Factory inspection: After production is completed, a third-party test report (such as SGS, CE certification) is provided. The customer pays the balance (70%) after confirming that the product is qualified.

Logistics arrangement: Delivery is arranged within 24 hours after receiving the balance. A logistics tracking number is provided (domestic logistics such as Deppon and SF Express; international logistics such as DHL and Maersk), and documents such as packing lists, commercial invoices, and bills of lading are sent.

Arrival tracking: The customer service team tracks logistics information in real time. In case of delays (such as bad weather, customs inspection), they communicate with the customer in a timely manner and coordinate solutions.

Customers submit sample applications through the official website, email, or phone, stating the purpose (such as engineering testing, bid verification), quantity, and receiving information.

Non-cooperative customers need to pay the sample fee (about 2000 yuan/10 meters) and freight. Cooperative customers can obtain samples for free (limited to 1 roll/time).

Samples are sent out within 2-3 working days, accompanied by a sample test report (including DC resistance, insulation thickness, withstand voltage, and other indicators).

When a customer finds a fault, they can call the 24-hour service hotline (400-XXX-XXXX) or send an email to the after-sales mailbox, stating the fault phenomenon, occurrence time, and on-site situation.

Technical personnel respond within 1 hour and give a preliminary solution within 4 hours; if on-site processing is required, they arrive within 24 hours in surrounding areas (radius 300 kilometers) and within 48 hours in remote areas.

On-site services include fault detection, cause analysis, repair or replacement, and a "Fault Handling Report" is provided to clarify preventive measures.

Provide cable laying guidance: According to the customer's laying environment (such as underground direct burial, pipeline, overhead), provide detailed laying plans (such as bending radius requirements, traction force limits, grounding methods), and technical personnel can be dispatched to guide the laying process on site.

Regular return visits: Conduct telephone return visits to cooperative customers every quarter to understand the operation status of the cable and provide maintenance suggestions (such as key points of regular inspection, preventive measures for insulation aging).

Training services: Provide free training for customers' operation and maintenance personnel (1-2 times a year), including cable structure principles, daily inspection methods, fault judgment skills, etc. The training is conducted in the form of on-site lectures or online live broadcasts.