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Solar cables are exposed to the external natural environment for a long time, and are exposed to strong ultraviolet rays of the sun, but also in hot, cold, humid, and polluted (such as dust, salt spray in coastal areas, chemical pollution in industrial areas, etc.) It is used in the environment and requires to withstand various mechanical external forces. Therefore, there are strict standard assessment requirements for each performance of the cable.
1. The temperature range of the solar cable is -40 to 90 ℃, the maximum operating temperature of the conductor is 120 ℃, and the allowable short-circuit temperature within 5 s is 200 ℃.
2. The bending radius of the cable is not less than 4 times the outer diameter of the cable.
3. The insulation and sheath are made of low-smoke halogen-free, flame-retardant, radiation cross-linked polyolefin material.
4. The designed service life of the cable meets the requirement of no less than 25a.
5. The cable not only has excellent ozone resistance, acid and alkali resistance, ultraviolet resistance, and salt spray corrosion resistance but also can withstand a wider range of temperature changes.
Due to the special use environment of solar photovoltaic cables, a number of performance tests must be carried out before the cables leave the factory, including the structural size inspection of the cable, the conductor DC resistance test, the finished voltage test, the insulation resistance test, the insulation long-term DC resistance test, and the surface of the sheath. Resistance test, insulation and sheath material performance test, low-temperature test, ozone resistance test, sheath weather resistance test, dynamic penetration, damp heat test, thermal life test, acid and alkali resistance test, halogen-free smoke density test, flame retardant test Wait for inspection items.
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