1. Relevant standards and specifications related to cable selection

1. DL/T5044-2004 People’s Republic of China Electric Power Industry Standard

2. GB50217 Power Engineering Cable Design Code

3. The selection of cable path should meet the following requirements

(1) Avoid the cable from being exposed to mechanical external force, overheating, corrosion and other hazards.

(2) Make the cable shorter under the condition of meeting the safety requirements.

(3) Easy to install and maintain.

(4) Avoid places that will be excavated

(5) The cable shall meet the requirements of the allowable bending radius of the cable when the components are changed up, down, left, and right in any laying mode and all path conditions.

2. Types, characteristics and laying methods of  solar power generation system cables The main types of  solar power generation system cables are:

 solar cables, power cables, control cables, communication cables, radio frequency cables

3. Selection and calculation of  solar cables

The selection of the cable cross section should meet the requirements of allowable temperature rise, voltage loss, mechanical strength, etc. The DC system cable is selected according to the long-term allowable current carrying capacity of the cable, and checked according to the allowable voltage drop of the cable. Note: The current carrying capacity of the cable is affected by the laying method and the surrounding environment Larger, the voltage drop of the cable is greatly affected by the length of the cable, so the current carrying capacity can be considered as a value that the cable will never exceed in long-term operation. It is best to choose the cable according to 70% to 80% of the cable carrying capacity to effectively guarantee The temperature rise and voltage drop of the line.