HY5CFPQ series of lightning protection insulator (hereinafter referred to as the lightning protection insulator), its structure is a set of metal oxide arrester and composite insulator as a whole, is arranged inside the air gap, greatly expanding the application, not only play a supporting role and line installation, can effectively absorb the leakage fault current on line caused by lightning attack. Due to the ingenious design of the discharge gap, when lightning strikes the tower, the lightning arrester will instantly connect and cooperate with the discharge gap to discharge the strong power frequency current to the earth. After the gap is cut off quickly, the insulation will be recovered immediately. Under the action of air gap, the arrester usually does not bear the power frequency voltage, and greatly reduces the aging process of the arrester, and also improves its service life. Lightning protection insulator used in the city distribution network, which can effectively prevent the breakage of overhead insulated wire lightning accidents, even in high altitude mountain mountains, swamp wetland, river crossing tower and frequent lightning activities and other harsh geographical environment and requirements of high reliability on the distribution line, the lightning outage rate greatly reduced insulation breakdown the failure rate and line breakage rate, but also reduce the amount of maintenance line.