In most cases, the DC cables used in photovoltaic power plants are used for long-term outdoor work. Due to construction conditions, connectors are mostly used for cable connection. Cable conductor materials can be divided into copper core and aluminum core. Copper core cables have better oxidation resistance, longer life, better stability, reduced pressure, and low power loss than aluminum core cables. During construction, due to the flexibility of the copper core, the allowable bending radius is small, which is convenient for turning and pipe penetration. Simple; the copper core is resistant to fatigue, repeated bending is not easy to break, and the connection is convenient; at the same time, the copper core has high mechanical strength and can withstand greater mechanical tension, which brings great convenience to construction and laying, and is also a mechanized construction Created the conditions. On the contrary, aluminum core cables are prone to oxidation (electrochemical reaction) at the installation joints due to the chemical properties of aluminum materials, especially creep phenomena, which can easily lead to failures.

      Therefore, copper cables have outstanding advantages in the use of photovoltaic power plants, especially in the field of directly buried cable power supply. It can reduce the accident rate, improve the reliability of power supply, and facilitate construction, operation and maintenance. This is also the reason why copper cables are mainly used for underground cable power supply in my country.