【摘要】 我国自主研发生产的植物绝缘油目前只应用在最高电压等级为35 kV的变压器中,缺乏国产植物绝缘油大间隙下击穿特性的试验数据支撑是限制其应用于更高电压等级变压器中的重要原因。本研究对比了进口、国产植物绝缘油和国产矿物绝缘油在雷电冲击电压和直流电压下的击穿特性。结果表明:国产植物绝缘油与进口植物绝缘油具有相似的雷电冲击和直流击穿特性。正极性下,植物绝缘油小间隙下(<25 mm)的击穿电压与矿物绝缘油相当甚至优于矿物绝缘油,但大间隙下矿物绝缘油的击穿电压优势更明显,此外,绝缘油在直流和雷电冲击电压下的击穿电压没有明显差异。负极性下,矿物绝缘油的击穿电压始终高于植物绝缘油,并且绝缘油的直流冲击击穿电压明显高于雷电击穿电压。更多还原

【Abstract】 The vegetable insulating oil developed and produced in China is currently only used in transformers with 35 kV of the highest voltage class. The lack of breakdown characteristics test data support of domestic vegetable insulating oil under large gap is an important limitation for its application in higher voltage transformers. In this paper, the breakdown characteristics of imported and domestic vegetable insulating oil and domestic mineral insulating oil under lightening impulse(LI) and direct current(DC) voltages were compared. The results show that the breakdown characteristics of domestic and imported vegetable insulating oil under LI and DC are similar. Under the positive polarity, the breakdown voltage of vegetable insulating oil under small gap(<25 mm) is equivalent to or higher than that of mineral insulating oil, but the breakdown voltage of mineral insulating oil under large gap is higher.There is no significant difference between the breakdown voltages of insulating oil under DC and LI.Under the negative polarity, the breakdown voltage of mineral insulating oil is always higher than that of vegetable insulating oil, and the breakdown voltage of insulating oil under DC is significantly higher than that under LI.更多还原