Connecting regional substations to local distribution networks.
Evacuating power from large-scale renewable energy farms (e.g., wind parks with 50+ turbines) to the national grid.
Supplying power to heavy-industry facilities (e.g., steel mills, cement plants) that require high, continuous power inputs.
Conductor Size | Continuous Current Rating (A) | Short-Circuit Current Rating (kA/1s) | Typical Application |
16mm² | 85 | 15 | Rural grid extensions, auxiliary industrial power |
25mm² | 110 | 20 | Commercial building main Power Lines, small wind farms |
50mm² | 170 | 32 | Medium-scale solar parks, industrial plant sub-distribution |
70mm² | 210 | 40 | Large commercial complexes, offshore wind auxiliary systems |
95mm² | 260 | 50 | Regional substation connections, heavy-industry main lines |
120mm² | 300 | 58 | Utility grid backbone, large wind farm power evacuation |
150mm² | 350 | 68 | High-power industrial facilities, multi-megawatt solar farms |
400mm² | 630 | 120 | National grid interconnections, utility-scale renewable energy hubs |
Cross-Sectional Area: Ranges from 16mm² to 400mm², with each size manufactured to tight tolerances (±2% of nominal area) to ensure consistent current-carrying capacity.
Stranding Structure: All conductors use a stranded design (per IEC 60228 Class 5), composed of multiple thin aluminum strands twisted together. For example:
16mm² conductor: 7 strands of 1.7mm diameter.
400mm² conductor: 61 strands of 2.9mm diameter.
Corrosion Protection: The aluminum strands are coated with a thin layer of zinc (hot-dip galvanization, ≥80g/m² zinc coating) to prevent oxidation and corrosion. This coating is critical for outdoor or humid applications, extending the conductor’s service life by 10–15 years.
Inner XLPE Insulation:
Material: Cross-linked polyethylene (XLPE) with a density of 0.92–0.94g/cm³.
Thickness: Varies with conductor size: 1.8mm (16mm²) to 4.5mm (400mm²), ensuring sufficient dielectric strength to withstand 33kV.
Electrical Performance: Dielectric strength ≥20kV/mm; insulation resistance ≥1000MΩ·km at 20°C; dielectric loss (tanδ) ≤0.003 at 20°C and 50Hz.
Thermal Resistance: Continuous operating temperature range: -40°C to 90°C; short-term overload temperature (up to 2 hours): 130°C; thermal aging resistance: ≤10% loss of tensile strength after 20,000 hours at 105°C.
Outer PVC Sheath:
Material: Polyvinyl chloride (PVC) compound with flame-retardant additives (e.g., aluminum hydroxide) and UV stabilizers.
Thickness: 1.2mm (16mm²) to 3.0mm (400mm²), providing abrasion and Chemical Resistance.
Mechanical Performance: Tensile strength ≥12MPa; elongation at break ≥150%; abrasion resistance ≤50mm³ (per ISO 4649).
Chemical Resistance: Resistant to dilute acids (pH 4–6), alkalis (pH 8–10), and mineral oils; no visible degradation after 1000 hours of immersion.
Steel Tape Armour (STA): Used for 16mm²–25mm² cables. Consists of two layers of galvanized steel tape (thickness 0.3–0.5mm) wrapped in opposite directions with 20–30% overlap. Provides lightweight protection against rodent bites, minor impacts, and abrasion. Suitable for indoor cable trays, overhead installation, or shallow underground ducts.
Steel Wire Armour (SWA): Used for 50mm²–400mm² cables. Composed of galvanized steel wires (diameter 1.2–2.5mm) twisted around the cable in a 1+6 or 1+6+12 configuration. Offers high tensile strength (≥50kN for 400mm² cables) and impact resistance, ideal for direct burial (up to 2m depth), industrial yards, or harsh outdoor environments.
IEC 60502-2: International standard for Power Cables with rated voltages from 6kV to 30kV.
IEC 60332-1: Flame-retardant standard for single cables (vertical flame test).
IEC 60811-1-1: Tests for insulation and sheath materials (tensile strength, elongation, water absorption).
GB/T 12706.2: Chinese national standard for high-voltage Power Cables (equivalent to IEC 60502-2).
CE Marking: Compliant with EU Low Voltage Directive (2014/35/EU) for sale in the European Union.
UL 1072: Standard for power cables for general applications (compliant for North American markets).
Base PE Resin: High-density polyethylene (HDPE) with a melt flow rate (MFR) of 0.5–1.0g/10min (at 190°C/2.16kg), ensuring good processability during extrusion.
Cross-Linking Agent: 1.0–1.5% DCP, which decomposes at extrusion temperatures (180–200°C) to form free radicals that link PE molecules.
Antioxidants: 0.1–0.3% phenolic antioxidants (e.g., Irganox 1010), preventing thermal oxidation during extrusion and long-term use.
Stabilizers: 0.2–0.5% calcium-zinc stabilizers, reducing degradation from UV radiation and moisture.
PVC Resin: Suspension PVC resin with a K-value of 60–65, providing good flexibility and impact resistance.
Plasticizers: 30–40% dioctyl phthalate (DOP) or diisononyl phthalate (DINP), enhancing flexibility (especially at low temperatures).
Flame Retardants: 20–30% aluminum hydroxide or magnesium hydroxide, which release water vapor when heated, suppressing flames and reducing smoke.
Stabilizers: 2–3% calcium-zinc stabilizers, preventing PVC degradation from heat and UV radiation.
UV Absorbers: 0.1–0.2% benzophenone-based UV absorbers (e.g., Chimassorb 81), protecting the sheath from sunlight-induced aging in outdoor applications.
Aluminum Wire Rods: Inspected for purity (via optical emission spectroscopy, OES) and mechanical properties (tensile strength, elongation). Only rods with 99.7% purity and tensile strength ≥80MPa are approved.
XLPE Compound: Tested for melt flow rate (MFR), density, and cross-linking efficiency. Samples are extruded into thin films and tested for dielectric strength and thermal aging resistance.
PVC Compound: Checked for flexibility (via low-temperature bend tests at -15°C), flame retardancy (via vertical flame tests), and UV resistance (via xenon arc exposure).
Steel Tapes/Wires: Inspected for thickness, galvanization coating weight (via magnetic induction), and tensile strength.
Aluminum wire rods are drawn into thin strands (diameter 1.0–3.0mm) using a wire drawing machine with diamond dies, ensuring precise diameter control.
XLPE and PVC compounds are pre-heated in a hopper dryer (temperature 80–100°C) to remove moisture, preventing bubbles during extrusion.
Uniform current distribution across the conductor.
Flexibility for installation.
Mechanical stability (preventing strand separation during handling).
Feeding the conductor into a single-screw extruder (screw diameter 65–90mm) with a temperature profile of 160°C (feed zone) to 200°C (die zone). The XLPE compound is melted and forced through a cross-head die (custom-sized for the conductor diameter) to form a uniform insulation layer.
Passing the Insulated Conductor through a vulcanization tube (length 10–15m) heated to 220–240°C. This tube uses high-pressure nitrogen to prevent oxidation of the XLPE and ensure complete cross-linking.
Cooling the insulated conductor in a water bath (temperature 20°C–30°C) to solidify the insulation, followed by a puller that maintains a constant speed (8–15m/min) to ensure uniform thickness.
Thickness Measurement: A laser-based thickness gauge scans the insulation at 12 points around the conductor, ensuring thickness meets specifications (e.g., 1.8mm ±0.1mm for 16mm² cables). Any deviation beyond ±5% results in the section being discarded.
Insulation Resistance Test: A 5kV megohmmeter measures the resistance between the conductor and a copper electrode wrapped around the insulation. The resistance must be ≥1000MΩ·km to pass.
Spark Test: The insulated conductor is passed through a high-voltage spark tester (15kV) to detect pinholes or defects. If a spark jumps to the conductor (indicating a defect), the machine automatically marks the section for repair or removal.
Steel Tape Armour (STA) for 16mm²–25mm² Cables:
Steel Wire Armour (SWA) for 50mm²–400mm² Cables:
Pre-Heating: The armoured cable is pre-heated to 60°C–80°C using an infrared heater to improve adhesion between the armour and sheath.
Extrusion: A twin-screw extruder (screw diameter 90–120mm) with a temperature profile of 150°C (feed zone) to 180°C (die zone) melts the PVC compound. The molten PVC is forced through a large-diameter cross-head die (custom-sized for the armoured cable) to form a uniform sheath layer.
Cooling and Sizing: The Sheathed Cable passes through a vacuum sizing tank (temperature 20°C–25°C) to ensure the outer diameter is consistent (e.g., 18mm ±0.2mm for 16mm² STA cables). It is then cooled in a second water bath to set the sheath.
Quality Inspection:
A caliper measures the sheath thickness at multiple points—thickness must be within ±0.1mm of the specified value.
A high-voltage spark tester (10kV) checks for sheath defects (e.g., pinholes).
A peel test evaluates adhesion between the sheath and armour—peel strength must be ≥3N/cm to prevent delamination.
Electrical Performance Tests:
Withstand Voltage Test: The cable is submerged in a saltwater bath (3.5% NaCl) and subjected to 70kV AC for 1 minute (phase-to-earth) and 120kV AC for 1 minute (phase-to-phase). No breakdown or current leakage (≤10μA) is allowed.
Dielectric Loss Test: A dielectric loss analyzer measures tanδ at 33kV and 50Hz. The value must be ≤0.003 to ensure minimal energy loss during operation.
Short-Circuit Test: The cable is connected to a high-current source and subjected to its rated short-circuit current (e.g., 120kA for 400mm² cables) for 1 second. After testing, the conductor and insulation must show no signs of melting or damage.
Mechanical Performance Tests:
Bend Test: The cable is bent around a mandrel (diameter 15×–20× the cable’s outer diameter) 10 times in each direction. No cracks in the sheath or armour are allowed.
Impact Test: A 5kg weight is dropped from 1m onto the cable (per IEC 60811-504). The cable is then tested for insulation resistance—no significant drop (≥80% of initial value) is acceptable.
Abrasion Test: A rotating drum abrasion tester (ISO 4649) rubs the cable against a sandpaper surface (P120 grit) with 50N force for 100 cycles. Sheath thickness loss must be ≤10% of the original.
Environmental Tests:
Temperature Cycling Test: The cable is exposed to 50 cycles of -40°C (4 hours) to 90°C (4 hours). After cycling, insulation resistance and tensile strength are tested—no more than 10% loss is allowed.
UV Resistance Test: The cable is exposed to a xenon arc lamp (102.4W/m² at 340nm) for 1000 hours. The sheath must retain ≥80% of its original tensile strength and show no cracking.
Application Scenarios:
Substation Interconnections: Connecting 33kV substations to form a regional power network, ensuring stable power supply during peak demand. For example, a utility company may use 150mm² Swa Cables to link two substations 10km apart.
Rural Electrification: Extending 33kV grids to remote rural areas, where the cable’s lightweight aluminum conductor and STA/SWA armour simplify overhead or underground installation. 25mm²–50mm² STA cables are commonly used for this purpose, as they balance current capacity and cost.
Grid Upgrades: Replacing old 油纸绝缘电缆 (oil-paper Insulated Cables) with XLPE-Insulated Cables, which require less maintenance and have a longer service life (25–30 years vs. 15–20 years).
Cable Configuration:
For underground substation connections: 120mm²–400mm² SWA cables with PVC sheaths (resistant to soil moisture and abrasion).
For overhead rural lines: 16mm²–50mm² STA cables with UV-stabilized PVC sheaths (to withstand sunlight exposure).
Performance Benefits:
XLPE insulation’s low dielectric loss reduces energy waste, saving utilities up to 5% in annual electricity costs compared to oil-paper cables.
Steel armour protects against damage from digging equipment (underground) or wind-blown debris (overhead), minimizing outage risks.
Aluminum Conductors lower installation costs—10km of 150mm² aluminum cable weighs 40% less than copper equivalents, reducing the need for heavy-duty poles and lifting equipment.
Application Scenarios:
Wind Farms: Connecting wind turbines (2MW–5MW each) to a central substation (collector cables) and transmitting power from the substation to the grid (evacuation cables). Offshore wind farms use the cable in shallow waters (up to 50m depth) to link turbines to offshore substations.
Solar Farms: Powering inverters (which convert DC to AC) and transmitting AC power from the farm’s substation to the grid. Utility-scale solar farms (≥100MW) often use 95mm²–240mm² cables to handle high currents.
Cable Configuration:
Offshore wind collector cables: 70mm²–150mm² SWA cables with marine-grade PVC sheaths (resistant to saltwater corrosion) and anti-fouling coatings (to prevent barnacle growth).
Solar farm evacuation cables: 120mm²–400mm² SWA cables with UV-stabilized sheaths (to withstand intense sunlight in desert or open-field locations).
Performance Benefits:
The cable’s ability to handle short-term overloads (up to 130°C) accommodates sudden power spikes from wind gusts or peak sunlight, preventing insulation damage.
SWA armour withstands mechanical stress from turbine vibration (wind farms) or construction equipment (solar farms), ensuring long-term reliability.
Cost-effectiveness—aluminum conductors reduce the total cable cost by 30–40% compared to copper, a critical factor for large renewable projects with tight budgets.
Application Scenarios:
Steel Mills: Powering electric arc furnaces (which require 33kV, 1000A+ currents) and rolling mills. The cable must withstand high temperatures (up to 60°C in factory environments) and exposure to dust and oil.
Chemical Plants: Distributing power to reaction vessels, pumps, and cooling systems. The cable’s chemical resistance is critical here, as it may come into contact with dilute acids or solvents.
Cable Configuration:
Steel mill main power lines: 240mm²–400mm² SWA cables with heat-resistant PVC sheaths (rated for 90°C continuous operation).
Chemical plant Distribution Cables: 50mm²–120mm² SWA cables with chemical-resistant PVC sheaths (tested to withstand immersion in 5% sulfuric acid for 1000 hours).
Performance Benefits:
XLPE insulation’s thermal stability ensures the cable operates reliably in high-temperature factory environments, reducing downtime from cable failures.
SWA armour protects against impact from heavy machinery and abrasion from dust or metal shavings, extending the cable’s service life to 25+ years.
Flame-retardant PVC sheaths comply with industrial fire safety standards (e.g., IEC 60332-1), minimizing fire spread risk in case of a short circuit.
Application Scenarios:
Airports: Powering terminal buildings, runway lighting, and air traffic control systems. The cable must be flexible enough to install in tight spaces (e.g., under runways) and resistant to vibration from aircraft.
Data Centers: Supplying power to backup generators and main electrical panels. High reliability is critical here, as downtime can cost data centers $10,000+ per minute.
Cable Configuration:
Airport runway lighting: 16mm²–25mm² STA cables with flexible PVC sheaths (minimum bending radius 15× outer diameter) for installation in narrow ducts.
Data center main lines: 95mm²–150mm² SWA cables with flame-retardant, low-smoke PVC sheaths (compliant with IEC 61034), reducing smoke inhalation risks in enclosed spaces.
Performance Benefits:
The cable’s low electrical resistance ensures stable voltage for sensitive equipment (e.g., air traffic control systems, data servers), preventing performance issues from voltage drops.
STA/SWA armour protects against rodent bites (common in urban underground ducts) and accidental damage during maintenance, minimizing outage risks.
Flexible stranding and sheath materials simplify installation in complex urban layouts, reducing labor costs by 20–30% compared to Rigid Cables.
Wooden Drums:
Material: High-density plywood (thickness 18mm–25mm) treated with anti-mold chemicals (e.g., chromated copper arsenate) to resist rot in humid environments.
Dimensions: Drum diameter ranges from 600mm (for 16mm²–25mm² cables) to 1200mm (for 400mm² cables), with a width of 300mm–600mm. The flanges (circular ends) are reinforced with steel rings to prevent bending during lifting.
Protection: The cable is wrapped in a layer of moisture-proof polyethylene (PE) film (0.1mm thickness) before winding, followed by a layer of heavy-duty kraft paper (120g/m²) to resist abrasion.
Steel Drums:
Material: Galvanized steel (thickness 1.5mm–2.0mm) for superior strength, used for 240mm²–400mm² SWA cables (which weigh 500kg+ per 100m).
Dimensions: Similar to wooden drums, but with thicker flanges (3mm–4mm) to support heavy loads.
Protection: In addition to PE film and kraft paper, a foam padding (5mm thickness) is placed between cable layers to prevent friction between the SWA and sheath.
Labeling:
Product details: Model (33kV armoured XLPE/PVC aluminum cable), conductor size, length, voltage rating.
Manufacturing information: Batch number, production date, quality certificate number.
Handling instructions: “Lift only at drum ends,” “Store in dry area,” “Maximum stack height: 2 drums (wooden) / 3 drums (steel).”
Safety warnings: “Keep away from open flames,” “Wear gloves when handling.”
Box Material: Double-walled corrugated cardboard (thickness 8mm) with a bursting strength of ≥2000kPa, capable of withstanding stacking and minor impacts.
Interior Protection: The cable is coiled into a compact circle (diameter 300mm–500mm) and wrapped in bubble wrap (thickness 5mm) to prevent kinking and abrasion. A 10g silica gel packet is added to absorb residual moisture, ensuring the cable remains dry during storage or transit.
Labeling: The box is labeled with the same product details as bulk drums, plus a “Fragile” sticker to alert logistics providers. Sample boxes include a simplified test report (summarizing key electrical and mechanical results) and a product brochure highlighting application scenarios.
Indoor Storage: Cables should be stored in a dry, well-ventilated warehouse with a temperature range of -5°C to 40°C and relative humidity ≤70%. Avoid proximity to heat sources (e.g., heaters, boilers) or chemicals (e.g., oil, solvents) that could degrade the PVC sheath.
Drum Storage:
Wooden drums: Place on level ground with 100mm wooden blocks under drum ends to prevent rolling. Do not stack more than 2 layers to avoid crushing lower drums.
Steel drums: Can be stacked up to 3 layers, but the total weight of upper layers must not exceed 1000kg. Use steel brackets between layers to distribute weight evenly.
Unused Cable: If a drum is partially used, rewind the remaining cable tightly onto the drum and cover with the original PE film and kraft paper. Seal the drum with waterproof tape to prevent dust and moisture ingress. Unused cables should be inspected for sheath cracks or armour corrosion every 6 months.
Shelf Life: When stored correctly, the cable has a shelf life of 3 years from the production date. After 3 years, the cable must undergo insulation resistance and withstand voltage tests before use to ensure performance.
Container Shipping: Cables are shipped in 20ft or 40ft ISO containers. Wooden drums are secured to the container floor with M16 steel bolts and wooden wedges to prevent rolling during rough seas. Steel drums are stacked (up to 3 layers) and secured with 50mm steel straps.
Moisture Protection: The container is lined with a moisture-absorbing blanket (100g/m²) to reduce condensation. A humidity sensor is placed inside, with real-time data accessible via a mobile app for the customer to monitor.
Customs Documentation: The manufacturer prepares all required documents, including:
Commercial Invoice: Details product value, quantity, and payment terms (e.g., FOB, CIF).
Packing List: Itemizes each drum’s weight, dimensions, and specifications.
Certificate of Origin (CO): Issued by a local chamber of commerce to qualify for import duty reductions (e.g., under EU-China trade agreements).
Compliance Certificates: CE marking (EU), UL certification (North America), or SABS certification (South Africa), depending on the target market.
Transit Time and Tracking: Sea transit takes 15–45 days (e.g., China to Europe: 25–35 days; China to North America: 15–25 days). The customer receives a container tracking number from the shipping line to monitor progress via the line’s website or app. The manufacturer’s logistics team provides weekly updates, including port arrival/departure times and potential delays (e.g., port congestion).
Truck Transportation: Heavy-duty trucks with flatbed or enclosed trailers are used. Enclosed trailers are recommended for long distances (≥500km) to protect against weather (rain, snow) and road debris. Flatbed trailers are suitable for short distances (≤300km) or oversized steel drums. Drums are secured with steel straps (tension ≥5kN) and wooden blocks.
Railway Transportation: For large bulk orders (≥50 drums), railway transportation is more cost-effective than trucks. Cables are shipped in railway containers with moisture-proof liners. Transit time is 2–7 days for domestic orders and 5–14 days for cross-border orders (e.g., Germany to Poland).
Last-Mile Delivery: For delivery to construction sites or remote areas, the manufacturer coordinates with local logistics providers. This may involve using off-road trucks for rural locations or partnering with port authorities for barge transportation to islands.
Cargo Planes: Cables are shipped in ULD containers (weight limit 100kg–1000kg). Small-length cables (10m–50m) are packaged in cardboard boxes; longer lengths (100m–500m) are wound onto lightweight aluminum drums to reduce shipping weight.
Speed and Cost: Air transit takes 2–7 days worldwide (e.g., China to the US: 3–5 days), but costs 3–5 times more than sea freight. It is recommended only for time-sensitive needs.
Regulatory Compliance: The manufacturer ensures compliance with air cargo regulations, including labeling hazardous materials (if applicable) and providing a Shipper’s Declaration for Dangerous Goods (SDDG) for PVC-insulated cables (classified as “limited quantity” hazardous materials in some regions).
Physical Damage: From accidents (truck collisions, ship grounding), natural disasters (hurricanes, floods), or improper handling (dropping drums).
Loss or Theft: Complete loss of the shipment (e.g., stolen containers) or partial loss (e.g., missing drums).
Claim Process: The customer must notify the manufacturer and insurer within 48 hours of receiving damaged goods, providing photos/videos of damage, a delivery receipt, and a detailed report. The insurer assesses the claim within 5–10 working days and arranges compensation (replacement, repair, or refund). The insurance premium is 0.3%–0.5% of the order value, added to the total cost or paid separately.
Order Confirmation: The sales team sends a formal confirmation within 24 hours, outlining specifications, quantity, delivery date, and payment terms. The customer signs and returns the confirmation to confirm agreement.
Production Scheduling:
Standard configurations (e.g., 50mm² SWA cable with PVC sheath): Production starts within 3–5 working days.
Customized configurations (e.g., UV-stabilized sheath for solar farms, anti-fouling coating for offshore wind): Production takes 10–15 working days, as additional time is needed to adjust extrusion dies or test custom materials.
Quality Inspection and Packaging: After production, the cable undergoes 1–2 days of testing. Once approved, it is packaged into drums/boxes and prepared for shipping. The manufacturer notifies the customer when the shipment is ready, providing drum count, total weight, and shipping documents.
Pre-Delivery Notification: The logistics team sends a notification 3–5 days before arrival, including the estimated date, time window (e.g., 9 AM–3 PM), and driver contact details.
Site Preparation Guidance: The manufacturer advises on site readiness, such as:
Ensuring a 10m × 5m space for the delivery truck.
Preparing a level surface for unloading drums.
Arranging lifting equipment (forklift or crane) for drums weighing >500kg (e.g., 400mm² steel drums weigh 800kg–1200kg).
Delay Management: If a delay occurs (e.g., production issues, logistics disruptions), the manufacturer notifies the customer immediately and provides a revised delivery date. For delays caused by the manufacturer’s negligence, a 1% discount on the total order value is offered per day (up to 10% maximum).
Quantity Verification: Check that the number of drums/boxes matches the packing list. Any discrepancies (e.g., missing drums) must be noted on the delivery receipt and reported to the manufacturer within 24 hours.
Package Integrity: Inspect drums/boxes for damage (e.g., broken flanges, torn cardboard, water stains). If damage is found, take photos/videos as evidence for insurance claims.
Product Check: For a random sample of drums, verify the cable’s specifications (conductor size, armour type) against the order confirmation. If the cable does not match the specifications, the manufacturer arranges for replacement or refund at no cost to the customer.
Laboratory Testing Samples: 1m–5m lengths, suitable for electrical tests (insulation resistance, withstand voltage) or material analysis (conductor purity, PVC composition).
Installation Trial Samples: 10m–20m lengths, ideal for testing flexibility, ease of installation, and compatibility with connectors or cable trays.
Submit a Request Form: Provide details such as desired conductor size, length, quantity, application scenario, and shipping address.
Confirmation and Quotation: The sales team reviews the request and confirms availability within 2 working days. For customized samples (e.g., special sheath materials), a quotation for additional costs (e.g., die adjustments) is provided.
Payment (If Applicable): For fee-based samples, the customer pays via bank transfer or online platforms (e.g., PayPal). For free samples, the customer provides shipping details.
Production and Shipping: Samples are produced within 3–5 working days and shipped via the customer’s preferred logistics (e.g., DHL, FedEx). A tracking number is provided once shipped.
Certificate of Analysis (COA): Summarizes test results (insulation resistance, tensile strength, flame retardancy).
Material Safety Data Sheet (MSDS): Details hazards, handling, and storage of materials (e.g., PVC, aluminum).
Installation Guide: Includes bending radius recommendations, termination methods, and compatibility with connectors.
24/7 Phone/Email Support: For urgent issues (e.g., installation errors, short circuits), engineers provide real-time guidance. For example, they may help troubleshoot a drop in insulation resistance or correct termination methods to prevent water ingress.
On-Site Support: For large-scale projects (e.g., utility grid upgrades, offshore wind farms), engineers are dispatched to the customer’s site to:
Inspect installation quality (e.g., check bending radii, secure terminations).
Conduct on-site tests (insulation resistance, withstand voltage) after installation.
Train the customer’s team on cable handling and maintenance best practices.
Online Resources: The manufacturer’s website features a knowledge base with technical documents (installation manuals, troubleshooting guides) and video tutorials (e.g., “How to Terminate 33kV SWA Cables” or “Drum Handling Safety”).
A copy of the delivery acceptance form.
Photos/videos of the defective cable.
A detailed description of the issue, including operating conditions (temperature, voltage).
Replacement: A new cable of the same specifications, with the manufacturer covering shipping and handling.
Repair: For minor defects (e.g., small sheath damage), a repair kit and guidance are provided.
Refund: A full or partial refund if replacement/repair is not feasible.
Regular Inspections:
Visual inspections every 6 months: Check for sheath cracks, armour corrosion, or loose terminations.
Electrical tests every 2 years: Measure insulation resistance (using a 5kV megohmmeter) and dielectric loss (tanδ) to detect early signs of degradation.
Cleaning: Wipe exposed cables with a damp cloth to remove dust and oil. Avoid harsh chemicals (e.g., acetone) that could damage the PVC sheath.
Environmental Protection:
For Outdoor Cables: Ensure UV-stabilized sheaths are not covered by debris (which traps heat and accelerates aging).
For Underground Cables: Mark the installation route with warning signs to prevent accidental digging damage.
Load Management: Avoid overloading the cable beyond its current rating, as this can cause insulation overheating and degradation. Use current monitors to track load levels during peak demand.
Hongtai Cable Technology Co., Ltd
E-mail: export@qlcables.com
sales@qlcables.com
Tel/Whatsapp:+86-18032066271
Adicionar: Zona de Desenvolvimento Industrial Xiaokou, Ningjin County, Cidade de Xingtai ， Hebei Província, China
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