Impact of photovoltaic cable on the system and purchase
Solar photovoltaic technology will become one of the future green energy technologies. The application of solar energy or photovoltaic (PV) is increasingly widespread in China. In addition to the rapid development of government-supported photovoltaic power plants, private investors are also actively building factories and plans to put into operation globally Sales of solar modules. However, for the time being, many countries are still at the learning stage. There is no doubt that for the best profit, industry players need to learn from countries and companies that have many years of experience in solar energy applications.
Building a cost-effective, profitable photovoltaic power plant represents the most important goal and core competency of all solar manufacturers. In fact, profitability depends not only on the efficiency or high performance of the solar module itself, but also on a range of components that appear to have no direct relationship to the component. However, all of these components (such as PV cables, solar connectors, PV junction boxes) should be selected based on the tenderer's long-term investment objectives. The high quality of the selected components avoids the solar system being unprofitable due to the high maintenance and maintenance costs.
For example, cabling systems that connect PV modules and inverters are often not considered critical components.
However, the failure to use a dedicated cable for solar applications will affect the life of the entire system.
In fact, solar systems are often used under harsh environmental conditions, such as high temperature and UV radiation. In Europe, sunny weather will cause solar systems to reach field temperatures of up to 100 ° C. At present, we can use a variety of materials, PVC, rubber, TPE and high quality cross-linked materials, but unfortunately, the rated temperature of 90 ° C rubber cables, and even rated temperature of 70 ° C PVC cable Also often used outdoors, obviously, this will greatly affect the life of the system.
Environmental stress
For photovoltaic applications, outdoor use of materials should be based on UV, ozone, severe temperature changes and chemical erosion may be. The use of low-grade materials under such environmental stress will result in fragile cable sheathing and may even break down the cable insulation. All of these situations directly increase the loss of the cable system and increase the risk of a shorted cable. In the medium and long term, there is also a higher probability of fire or personal injury.
The solar cable is an electron beam cross-link cable rated at 120 ° C to withstand harsh weather conditions and withstand mechanical shock in its equipment . According to the international standard IEC216, RADOX? Solar cables, in outdoor environments, the service life of rubber cables is eight times that of PVC cables 32 times. These cables and components not only provide the best weather, UV and ozone resistance but also withstand a wider range of temperature changes (eg, from 40 ° C to 125 ° C).
To cope with the potential heat hazard, manufacturers tend to use double insulated rubber sheathed cables. However, the standard version of this type of cable is only allowed for use in environments with a maximum operating temperature of 60 ° C. In Europe, temperatures on the roof can be measured up to 100 ° C.
The solar cable is rated at 120 ° C (20,000 hours of use). This rating is equivalent to 18 years of continuous temperature at 90 ° C and longer than 90 ° C. Often, the life of solar equipment is required to be 20 to 30 years old.
For all these reasons, it is imperative to use specialized solar cables and components in solar systems.
Anti mechanical load
In fact, during installation and maintenance, the cables can be routed on the sharp edges of the roof structure while the cables are subject to pressure, bending, tension, cross-tensile load and strong impact. If the cable jacket is not strong enough, the cable insulation can be severely damaged, affecting the lifetime of the entire cable or causing problems such as short circuits, fire and personal injury.
Cross-linked by radiation materials, with high mechanical strength. The cross-linking process alters the chemical structure of the polymer, the conversion of the fusible thermoplastic to a non-fusible elastomer material, and the cross-linking radiation significantly improves the thermal, mechanical and chemical properties of the cable insulation.
Electrical properties
1. DC resistance finished cable 20 ℃ conductive core DC resistance is not greater than 5.09Ω / km.
2. Submerged voltage test The finished cable (20m) does not breakdown after 5h immersion time (1h) in (20 ± 5) ℃ water immersion time (AC 6.5kV or DC 15kV).
3. Long-term withstand DC voltage sample length 5m, into the (85 ± 2) ℃ 3% sodium chloride (NaCl) in distilled water (240 ± 2) h, exposed at both ends of the water 30cm. DC core and water plus DC 0.9kV voltage (conductive wire connected to the positive, water connected to the negative). After removing the sample immersion voltage test, the test voltage is AC 1kV, requiring no breakdown.
4. Insulation resistance of the finished cable 20 ℃ insulation resistance of not less than 1014Ω? Cm, finished cable 90 ℃ insulation resistance of not less than 1011Ω? Cm.
5 sheath surface resistance finished cable sheath surface resistance should not be less than 109Ω.
Photovoltaic cable applications
Widely used in indoor and outdoor installation of solar energy equipment, electrical installation line.
Features: Low smoke and halogen free, excellent cold resistance, UV resistance, ozone resistance and weatherability. Flame retardant, cut-resistant, resistant to penetration. Cable protection level â…¡ level.
Ambient temperature: -40 ℃ ~ +90 ℃;
The maximum conductor temperature: 120 ℃ (short circuit temperature allowed within 5s 200 ℃);
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