中文摘要：

为研究不同悬挂方式对直流盘型绝缘子污闪特性 的影响,给特高压输电线路绝缘配置提供试验依据,在高海拔地区（昆明,海拔1 970 m）对XZP1-300和XZPS-300进行了不同悬挂方式（I、V及Y串）下的人工污秽试验,其中V串包括了60°、90°和120°3种角度;Y串上部夹角为90°。通过对高速摄影仪拍摄的放电发展过程的分析,揭示了悬挂方式、绝缘子形状、盐密等因素对电弧发展的影响,并解释各种情况下污闪电压不同的原因。推荐在重污秽条件下用V型串,轻污秽条件下使用I型串。

英文摘要：

In the area of high altitude in Kunming （1 970 m）, for two different types of DC porcelain insulators： XZP1-300 and XZSP-300, the artificial contamination tests are carried out in different types of suspension styles （I-, V-, Y- string） to study the influences of suspension styles on flashover performance of DC porcelain insulators, as well as to provide evidences for insulation selection for UHV transmission lines. V strings include three different angles： 60°, 90° and 120°. The angle of the top-half of Y string is 90. The arcing behavior on natural polluted insulator surfaces was studied using a PCI-2000S high speed camera. The experimental results show that the DC arcs play an important role in the flashover performances since the DC arcs levitate more easily from the porcelain surfaces at high altitudes than at sea level. According to the photos of the flashover process, the factors （suspension style, insulator shape and ESDD） how to influence the development of the electric arc is studied. And the reason of the difference is explained. A suggestion that V- string should be used in heavy polluted and I- string in others is obtained.