Irradiation cross-linking is used the high-energy electron beam generated by the electron accelerator to bombard the insulating layer and the sheath to break the polymer chain, and each broken point becomes a free radical. Free radicals are unstable and must be recombined with each other. After recombination, the original chain molecular structure becomes a three-dimensional network molecular structure to form crosslinks. The performance of low-smoke halogen-free XLPE materials is special to the irradiation tools. The following five points should be paid attention to when the solar cable is irradiated:

1. Before the solar cable is irradiated, check whether the conductor of each cable head is fully grounded. It is strictly forbidden to irradiate the cable without grounding.

2. When the insulated core and sheath layer are irradiated, the absorbed dose shall be subject to the qualified thermal extension test.

3. The surface of the irradiated insulated core and sheath layer should be smooth, free of oil stains, and have no obvious change in color. The insulating layer should not be scratched, fluffed, cracked, or air bubbles and the printing should be clear and pollution-free.

4. The traction and take-up speed should be coordinated with the beam current adjustment action when the solar cable is irradiated to increase or decrease the speed to avoid overdose or underdose.

5. After the insulated core and sheath layer are irradiated, they need to be grounded and fully discharged, and parked for 48 hours before they can be transferred to the next process.