Technical Solution for Solar Photovoltaic (PV) Cables

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Technical Solution for Solar Photovoltaic (PV) Cables

Issued by: Hebei Yongshang Cable Group Co., Ltd.

1. Project Overview

1.1 Project Background and Significance
The global new energy industry develops rapidly, and solar photovoltaic power generation has become one of the core clean energy sectors. PV cables are key connecting components for photovoltaic power stations, responsible for transmitting electric energy generated by solar modules.
PV cables operate outdoors all year round, enduring strong sunlight, large temperature differences, rain, snow, wind and sand, as well as long-term current load. Ordinary common cables cannot adapt to such harsh working conditions, which easily causes aging, insulation failure and safety hazards.
To match the high-standard operation demands of photovoltaic projects, Hebei Yongshang Cable Group develops professional technical solutions for solar PV cables. This set of technologies effectively improves the environmental adaptability, safety and service life of products, guarantees the stable operation of photovoltaic power systems, and also helps our company to enhance product competitiveness in the new energy cable market.
1.2 Existing Defects of Traditional Cables in PV Systems
Traditional ordinary cables applied in photovoltaic scenarios have prominent shortcomings. They feature poor ultraviolet resistance, and the outer sheath is prone to cracking and powdering under long-term solar irradiation. Weak heat resistance leads to accelerated material aging under high ambient temperature and continuous load heating. Besides, ordinary cables have insufficient weather resistance, oil resistance and abrasion resistance, and are vulnerable to damage during laying and long-term outdoor use. In severe cases, insulation breakdown, electric leakage and circuit failure will occur, increasing operation risks and maintenance costs of photovoltaic power stations.
1.3 Solution Objectives and Application Scope
1.3.1 Core Technical Objectives
1.Enable PV cables to possess excellent UV resistance, weather resistance, heat resistance and low-temperature resistance, adapting to all-weather outdoor operation.
2.Ensure stable electrical performance under long-term DC load and frequent power on/off conditions.
3.Improve mechanical properties including tensile strength, abrasion resistance and tear resistance to adapt to complex laying construction.
4.Reach long service life, reduce failure rate and overall operation and maintenance cost of photovoltaic projects.
5.Comply with international and domestic PV cable standards, realizing mass production and standardized supply.
1.3.2 Application Scope
This technical solution is applicable to all kinds of photovoltaic power station projects, including large ground-mounted photovoltaic power plants, distributed rooftop photovoltaic systems, agricultural complementary photovoltaic projects, photovoltaic charging stations and other scenarios. It covers DC connecting cables for solar modules, combiner box connecting cables, inverter incoming and outgoing cables, as well as special PV cables for medium and small photovoltaic systems. The products are suitable for laying in open air, overhead, pipeline, ground surface and other ways.

2. Working Environment and Performance Requirements of PV Cables

2.1 Typical Operating Environmental Characteristics
1.Strong ultraviolet radiation: Long-term exposure to direct sunlight, UV rays will erode polymer materials of cables.
2.Large temperature variation: High temperature in summer and low temperature in winter, with drastic temperature changes between day and night.
3.Complex climatic conditions: Exposed to rain, snow, frost, dew, wind and sand all year round, accompanied by damp and humid environment.
4.Special electrical working condition: Long-term DC power transmission, with continuous rated current and occasional instantaneous current impact.
5.External mechanical damage risk: Friction, extrusion and stretching during laying and later operation.
2.2 Mandatory Performance Requirements for PV Cables
1.Weather resistance: Long-term outdoor use without obvious aging, cracking or performance degradation.
2.UV resistance: Resist long-term ultraviolet irradiation and maintain intact sheath and insulation structure.
3.Temperature resistance: Work stably under continuous high temperature and keep flexibility at low temperature.
4.Electrical performance: Excellent insulation performance, stable DC voltage resistance and low leakage current.
5.Mechanical performance: High tensile strength, tear resistance and abrasion resistance.
6.Additional performance: Good oil resistance, flame retardancy and corrosion resistance to adapt to complex on-site environments.

3. Core Technical Solutions for PV Cables

3.1 High-performance Material Formula Optimization
Materials are the core guarantee for PV cable quality. We select special polymer materials and optimize formulas in a targeted manner.
1.Special insulation materials: Adopt cross-linked polyolefin and other special insulating materials with superior heat resistance, DC resistance and aging resistance, which adapt to long-term DC transmission of photovoltaic systems.
2.Weather-resistant sheath materials: Use high-strength UV-resistant and weather-resistant special materials as outer sheath, effectively resisting ultraviolet erosion and climatic aging.
3.Functional additives: Add high-efficiency anti-UV agents, antioxidants, heat stabilizers and tougheners in scientific proportion to comprehensively enhance the material’s adaptability to harsh environments.
4.Conductor optimization: Adopt high-purity copper conductors with optimized twisting process, featuring low resistance, good conductivity and strong anti-fatigue ability.
3.2 Structural Design Optimization
Combined with the laying and operation characteristics of photovoltaic cables, we carry out targeted structural upgrading.
1.Compact layered structure: Adopt conductor + inner insulation + outer sheath compact structure, with uniform thickness of each layer to avoid local stress concentration.
2.Reinforced protective structure: Properly increase the thickness of insulation and sheath reasonably on the premise of meeting standard requirements, to enhance protection ability.
3.Flexibility design: Optimize the twisting pitch and material hardness, ensure good bending performance, convenient for on-site laying and wiring.
4.Integral sealing design: Tightly combine all structural layers to prevent rainwater and moisture from penetrating inside.
3.3 Specialized Production Process Control
Strict and professional production processes ensure stable and consistent product performance.
1.Precise extrusion process: Control extrusion temperature, speed and pressure in real time to ensure uniform material plasticization and compact forming.
2.Cross-linking process management: Adopt advanced cross-linking technology to improve the molecular structure stability of insulation and sheath materials, and greatly enhance aging resistance.
3.Twisting process standardization: Standardize conductor twisting parameters to guarantee conductor roundness and structural stability.
4.Full-process impurity control: Implement dust-free management in production workshops to prevent impurities from mixing into materials and affecting insulation performance.
3.4 Flame Retardant & Safety Enhancement Technology
For the safety requirements of photovoltaic power stations, we add targeted safety technologies.
1.Environment-friendly flame retardant formula: Add halogen-free low-smoke flame retardant components, so that the cable has good flame retardant performance, and will not release toxic and harmful gas when burning.
2.Insulation reinforcement technology: Strengthen the insulation anti-breakdown ability to avoid electric leakage and short circuit faults caused by insulation damage.

4. Performance Testing and Compliance Verification

4.1 Implementation Standards and Test Items

All tests are implemented in accordance with national standards, industry standards and international photovoltaic cable specifications. Main test items include ultraviolet aging test, long-term weathering test, high and low temperature cycle test, DC voltage resistance test, insulation resistance test, tensile and tear test, abrasion test, flame retardant test and damp heat aging test.
4.2 Accelerated Simulation Aging Test
Carry out multi-group accelerated simulation tests for outdoor working conditions:
1.UV aging test: Simulate long-term solar ultraviolet irradiation to detect material and performance changes.
2.Weathering comprehensive test: Simulate the combined effect of sunlight, rain and temperature change to verify overall weather resistance.
3.High and low temperature cycle test: Conduct repeated temperature impact tests to check material flexibility and structural stability.
4.Long-term load aging test: Continuously apply rated DC current to simulate long-term operating state of on-site cables.
4.3 Electrical and Mechanical Performance Detection
After all simulation tests, use professional testing equipment to re-detect core indicators. Compare the data before and after the test to confirm that the electrical conductivity, insulation performance and mechanical strength of the cable remain within the standard range.
4.4 Compliance and Effect Evaluation
All products pass all standard tests and meet the technical requirements for photovoltaic cables. The test results prove that the PV cables adopting this solution have outstanding outdoor adaptability, stable performance and long service life, fully satisfying the operation demands of various photovoltaic projects.

5. Classification and Scene Matching of PV Cables

5.1 Conventional Outdoor PV Cables
Suitable for general ground photovoltaic power stations, conventional rooftop distributed photovoltaics and other common scenarios. With balanced performance and cost, it meets the demands of daily outdoor laying and long-term operation.
5.2 High-temperature Resistant PV Cables
Aimed at high-temperature areas, closed cable trenches and regions with strong solar radiation. Adopt enhanced heat-resistant materials to keep stable performance under long-term high temperature.
5.3 Low-temperature Resistant PV Cables
Specially developed for alpine and cold regions. The materials maintain excellent flexibility and will not become hard or brittle under ultra-low temperature environment.
5.4 Flame Retardant & Fire-resistant PV Cables
Applied for photovoltaic projects with high fire protection requirements such as indoor combiner boxes, inverter rooms and densely arranged cable areas, to improve overall operation safety.

6. Implementation Process of the Technical Solution

6.1 R&D Formulation and Sample Production

The R&D team completes material formula demonstration, structural design and process formulation. Carry out small-batch sample production, and conduct repeated performance tests and parameter optimization on samples.
6.2 Pilot Production and Process Debugging
After samples pass the inspection, launch pilot production on the formal production line. Track the whole production process, adjust processes and formulas according to production feedback, to realize the perfect matching between technology and production equipment.
6.3 Formal Mass Production
Sort out complete production operation specifications, process standards and quality inspection norms, and organize large-scale stable mass production to ensure unified product quality.
6.4 On-site Application and After-sales Tracking
Track the service status of products in various photovoltaic projects for a long time, collect user feedback and on-site operation data, and continuously optimize products and technologies.

7. Cost-Benefit Analysis

7.1 Production Cost Analysis
Due to the adoption of high-performance special materials and optimized processes, the production cost of PV cables is slightly higher than ordinary cables. Through formula improvement and production efficiency promotion, our company effectively controls the cost within a reasonable range.
7.2 Whole Life Cycle Benefits
PV cables with excellent performance have longer service life and lower failure rate. They reduce the frequency of cable replacement, on-site maintenance and power outage losses for photovoltaic power stations, and create higher comprehensive economic benefits for project owners in the whole life cycle.
7.3 Comprehensive Value
High-quality PV cables guarantee the safe and stable power generation of photovoltaic systems, reduce potential safety accidents, and bring dual value of economy and safety to new energy projects.

8. Risk Assessment and Countermeasures

8.1 Technical Risks and Solutions
Possible risk: Individual materials have insufficient stability in extreme high temperature, low temperature or strong ultraviolet environment. Countermeasures: Strengthen extreme condition simulation tests, reserve multiple alternative formulas, and recommend matched products according to different regional environments.
8.2 Production Quality Risks and Control
Possible risk: Parameter deviation in mass production leads to inconsistent product performance. Countermeasures: Implement full-process quality inspection, regular sampling re-testing, and strictly execute process standards to ensure product consistency.
8.3 On-site Application Risks and Suggestions
Possible risk: Improper laying construction causes cable damage. Countermeasures: Provide professional laying guidance and technical notes, remind customers of standardized construction and daily maintenance.

9. Conclusion and Market Prospect

9.1 Solution Summary
This PV cable technical solution launched by Hebei Yongshang Cable Group is developed targeting the harsh outdoor working conditions of photovoltaic systems. Starting from materials, structure, technology and testing, we have completed all-round technical upgrading. The products have excellent UV resistance, weather resistance, temperature resistance, electrical performance and mechanical performance, fully complying with the use requirements of various photovoltaic projects.
9.2 Subsequent Technical Optimization Direction
In the future, our R&D team will continue to develop higher-performance, environment-friendly and cost-effective new materials and structures. We will focus on ultra-long-life PV cables, lightweight photovoltaic special cables and customized products for special extreme environments to enrich product lines.
9.3 Market Development Prospect
Driven by the global dual-carbon goal, the photovoltaic industry will maintain steady growth, and the market demand for high-quality PV cables will keep rising. Relying on mature technical solutions and reliable product quality, our company will continue to provide high-standard photovoltaic cable products and professional technical services for new energy customers at home and abroad, and jointly promote the development of the clean energy industry.

Hebei Yongshang Cable Group Co., Ltd. is a modern comprehensive enterprise integrating cable R&D, production, sales and service. We own advanced production lines, complete testing equipment and a professional technical team. Focusing on new energy, power transmission, engineering construction and other fields, the company strictly controls product quality, keeps technological innovation, and provides safe, durable and cost-effective cable products for global customers. Our products have won wide recognition and trust in the industry.