In order to design anti-pollution flashover strategy for porcelain long rod insulator

the pollution flashover performance needs to be investigated. Consequently

we analyzed the contaminant distribution and composite of porcelain long rod insulator in AC 500 kV transmission line

and studied the influences of contaminant distribution and composite on the AC pollution flashover performance of porcelain long rod insulator. Moreover

we discussed the application of porcelain long rod insulator in UHVAC transmission line

and compared RTV and composite assistant shed on anti-pollution effect. There is more contaminant accumulated on leeward side and big shed bottom surface of porcelain long rod insulator. Contaminant unevenness on top and bottom surface increases the pollution flashover voltage

whi

le contaminant unevenness on windward and lee side decreases the pollution flashover voltage of porcelain long rod insulator. With the increase of CaSO

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content

pollution flashover voltage of porcelain long rod insulator increases. Pollution flashover voltage has a linear relation with the string length of porcelain long rod insulator. RTV coating and composite assistant shed can increase the pollution flashover voltage of porcelain long rod insulator while the effect of RTV coating is more significant.