Su Zhiyi，Liu Yansheng．Compassion of natural contaminants accumulated on surfaces of suspension and post insulators with DC and AC stress in Northern China’s inland areas[J]．Power System Technology，2004，28(10)：13-17(in Chinese)．
Su Zhiyi，Liang Xidong，Yin Yu，et al．Outdoor insulation selection method of HVDC lines[C]．The 14th International Symposium on High Voltage Engineering，Beijing，2005．
Hu Yi，Wang Tiejie．The research of insulator seting-up program of the Sanxia-Huadong ±500 kV DC transmission line[J]． High Voltage Engineering，1998，24(3)：70-73(in Chinese)．
Cai Chengliang，Tan Zhangying，Ding Daxue．The influence of contamination on the 500kV HVDCE equipment and the methods of preventing HVDC equipment from pollution flashover[J]．High Voltage Engineering，1996，22(3)：50-52(in Chinese)．
[9]
郑健超．高压直流输电线路绝缘子的选择方法[J]．电力技术，1984，17(5)：15-20．
[10]
Zheng Jianchao．Determination methods of insulator units for HVDC transmission lines[J]．Electric Power，1984，17(5)：15-20(in Chinese)．
Naito K，Schneider H M．Round-robin contamination test on high voltage DC insulators[J]．IEEE Trans on Power Delivery，1995，10(3)：1438-1442．
[14]
Comber M G，Nigbor R J．Performance of contaminated insulators tested from 200 kV to 1 000 kV DC[J]．IEEE Transactions on Electrical Insulation，1981，16(2)：230-234．
[15]
Fujimura T，Naito K，Suzuki Y．DC flashover voltage characteristics of contaminated insulators[J]．IEEE Transactions on Electrical Insulation，1981，16(2)：189-198．
Wu Guangya，Cai Wei，Lu Yanlong，et al．Selection of numbers of insulator of pollution insulator strings for DC transmission line [J]．High Voltage Engineering，2001，27(6)：51-53(in Chinese)．
