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Photovoltaic cable
Solar energy technology will become one of the future of green energy technology, solar or photovoltaic (PV) in China increasingly widely used, in addition to the rapid development of government-supported photovoltaic power plants, private investors are also actively build factories, plans to put into production in the global sales Of the solar modules.
The characteristics of the PV cable is determined by its cable insulation and sheathing material, which we call cross-linked PE. After irradiation with the irradiating accelerator, the molecular structure of the cable material is changed to provide its performance The Anti-mechanical load In practice, during installation and maintenance, the cable can be routed on the sharp edges of the roof structure, while the cable is subject to pressure, bending, tension, cross-tensile loads and strong shocks. If the cable jacket is not strong enough, the cable insulation will be severely damaged, thus affecting the life of the entire cable, or lead to short circuit, fire and personnel damage and other issues.
structure
Conductor: Tinned soft copper monofilament 2.5,4,6,10,16mm2 PV1-F
Insulation: Irradiation Crosslinked polyolefin insulation
Sheath: Irradiation Crosslinked Polyolefin Sheath
analysis:
(1) ordinary cable from Table 1 can be seen using the conductor and the same photovoltaic cable.
(2) ordinary cable insulation and sheath from Table 1 can be seen different from the photovoltaic cable.
(3) Ordinary cable is only suitable for use in general environment.
(4) the advantages of photovoltaic power cable: high temperature, cold, oil, acid and alkali salt, anti-ultraviolet, flame retardant, environmental protection, photovoltaic power cable is mainly used for harsh environment, the service life of more than 25 years.
Main performance
1. electrical performance
Finished cable 20 ℃ when the conductive core DC resistance is not greater than 5.09Ω / km.
2. Immersion voltage test
The finished cable (20m) was not punctured by a 5min voltage test (AC 6.5kV or DC 15kV) after 1h of immersion in water at (20 ± 5) ° C.
3. Long-term resistance to DC voltage
The samples were filled with (85 ± 2) ° C (240 ± 2) h in 3% sodium chloride (NaCl), and the water was exposed to 30 cm at both ends. Wire and water plus DC 0.9kV voltage (conductive wire core connected to the cathode, water connected to the negative). Remove the sample after the immersion voltage test, the test voltage for the exchange of 1kV, requires no breakdown.
4. Insulation resistance
Finished insulation at 20 ℃ when the insulation resistance of not less than 1014Ω · cm, finished cable 90 ℃ when the insulation resistance of not less than 1011Ω · cm.
5. Sheath surface resistance
The surface resistance of the finished cable sheath shall be not less than 109Ω.
Application of photovoltaic cable
Widely used in indoor and outdoor solar equipment, electrical installation with the line.
Features: low smoke zero halogen, excellent cold, UV resistance, ozone resistance and weather resistance. Flame retardant, resistant to cutting, resistant to penetration.
Cable protection level 2.
Ambient temperature: -40 ℃ ~ +90 ℃; conductor maximum temperature: 120 ℃ (5s within the short circuit temperature is allowed to 200 ℃);
Rated voltage: AC0.6 / 1KV DC1.8KV
Design life: 25 years