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电网技术  2009 

空间电荷对油纸绝缘体击穿强度和沿面闪络的影响

, PP. 76-79

Keywords: 体击穿,换流变压器,沿面闪络,油纸绝缘,空间电荷

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Abstract:

换流变压器是直流输电工程的核心设备之一,其结构和工作状况比传统交流变压器更为复杂。针对换流变压器的特点,设计了相应的试验装置,初步对油纸绝缘中的体击穿和沿面闪络进行了试验研究。试验结果表明,极性反转现象同样存在于油纸绝缘系统中。即在直流电压下油纸绝缘中积聚的空间电荷畸变了周围的电场,导致油纸绝缘的直流击穿强度发生改变。同时,对油纸绝缘进行的沿面闪络试验表明,空间电荷的存在同样会影响油纸绝缘的沿面闪络。通过对上述试验结果进行讨论,发现传统交流变压器的设计理论和经验已不能满足换流变压器的要求,在换流变压器设计和制造中应给予空间电荷问题足够的关注。

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