Application of PSL□-12/4 lightning protected supporting insulator in distribution line

Insulated conductor has many advantages and the insulated rate of 10KV overhead distribution lines at present is considerably high; however, insulated conductor will surely break when stricken by lightning. The defect that relay protection may not act after the conductor is broken will bring an even greater hidden danger to the circuit. This paper describes the operation situation of lightning protected supporting insulator to prove that the lightning protection function of lightning protected insulator on circuit is effective and remarkable via analyzing typical cases of lightning accident. Installing grounding device on lightning protected insulator is not only favorable to release lightning current but is able to play a function of lightning protection as well. Suggestions on improvement of the lightning protected insulator in future popularization and application of lightning protected insulator are proposed in this paper.