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高压电器  2014 

铜类产物对油纸绝缘频域介电谱特性的影响

, PP. 14-20

Keywords: 铜类产物,油纸复合绝缘,频域介电谱,离子极化,弛豫机制,Cole-Cole模型

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Abstract:

油浸式电力变压器内部的铜部件易受变压器油老化产生的杂质(酸、硫等物质)的腐蚀而引起变压器故障,为寻求有效监测铜类产物质量分数的途径,对变压器油纸绝缘进行了加速热老化实验,采用两组不同的试样,对铜类产物质量分数不同时变压器油纸绝缘体系的频域介电谱进行了比较分析,结果表明铜类产物的存在对油纸绝缘复介电常数实部的影响较小,而对复介电常数虚部和介质损耗的影响较大,这种影响在中频段(100~104Hz)最为显著;铜类产物的存在对油纸绝缘体系中的弛豫机制产生了影响,强化的界面极化和离子极化导致了中频段弛豫中心的分开,采用两种不同的弛豫模型对变化前后的频域介电谱曲线进行拟合,拟合结果显示新的弛豫模型有效。

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