Conventional cables cannot meet the complex and changeable use environment of photovoltaic power stations, leading to frequent quality problems in photovoltaic power stations. The dedicated solar photovoltaic cable is designed in accordance with the complex and changeable photovoltaic power station use environment, which can meet the requirements of the installation and operation of photovoltaic power stations. So what are the corresponding technical characteristics that photovoltaic cables must have in order to meet the requirements of photovoltaic power plants?
1. High and low-temperature characteristics requirements
Photovoltaic power plants are built all over the world, which requires cables to have a relatively large range of temperature resistance and can withstand low and high temperatures. The special photovoltaic cables use 125°C XLPE material and sheath material respectively. As long as the maximum working temperature of the cable conductor is not higher than 125°C, the cable will not have the problem of insulation degradation or failure. In addition, the low-temperature resistance limit of the jacket material of the photovoltaic cable is -40℃, which can meet the low-temperature environment requirements in most regions.
2. Humidity and heat characteristics requirements
Changes in temperature and humidity have a direct impact on the insulation and sheath aging of the material. The insulation and sheath materials required for photovoltaic cables must have a tensile strength and elongation at break not greater than 30% under 85% humidity.
3. UV resistance requirements
Photovoltaic power plants have a long sunshine time, and they can withstand the intensity of sunlight radiation. Ultraviolet rays can accelerate the aging of the cable insulation and sheath. Many cables of photovoltaic power stations are laid bare, which requires that the cables must be able to withstand sunlight and ultraviolet radiation, and can ensure normal operation for a long time under the vertical radiation of sunlight and ultraviolet radiation.
4. Acid and alkali resistance requirements
For areas such as seasides and tidal flats with high air salt spray content, the cables used must have strong salt spray and acid-base resistance. Photovoltaic cables use tinned copper conductors, which can enhance the oxidation and corrosion resistance of the conductors.
5. Ozone requirements
Some photovoltaic power plants are located in areas where the ozone content is high, and ozone has a certain corrosive effect on the cable sheath. Qualified photovoltaic cables must pass the ozone resistance test specified in GB/T2951.21-2008, that is, photovoltaic cables can work normally for a long time in areas with high ozone content.
