Development of the cable for photovoltaic power generation systems

摘要

We have developed a cable for photovoltaic power generation systems, which meets the requirements of the TUEV 2Pfg1169/2007 Standard and the JCS4517 Standard. A cable for photovoltaic power generation systems, which meets the requirements of these Standards, requires that insulating materials sad sheath materials are made of halogen-free materials. In addition to that, the cable requires vertical incombustibility, high-temperature heat resistance, low-temperature characteristics, and scid resistance. Furthermore, a temperature index is required to be more than 120℃, because temperatures in working environment range from -40℃ to -90℃. A temperature at which an aging residue percentage reaches 50% after 20,000 hours is required to be higher than 120℃. In particular, excellent heat-deterioration characteristics are required. At this time, crosslinked polyethylene was used as an insulator of the cable, highly incombustible crosslinked polyolefin was used as sheath materials. As a result, this made it possible to meet the requirements of the above-mentioned Standards. In addition, it was confirmed that there is no problem in putting this Cable to practical use in terms of peeling characteristics and bleed characteristics. Furthermore, it is possible to manufacture this Cable without using special bridging equipment such as electron-beam irradiation machines. This Cable is very advantageous in terms of costs and response to mass production.