为将电介质频率响应法推广应用于变压器绝缘状态评估,利用电介质频率响应法对110 k V及220 k V油浸式变压器高压-低压套管之间的油纸绝缘系统进行电介质响应测试;建立RC弛豫模型解析变压器油纸绝缘体系的绝缘性能,并通过最佳优化方法获...为将电介质频率响应法推广应用于变压器绝缘状态评估,利用电介质频率响应法对110 k V及220 k V油浸式变压器高压-低压套管之间的油纸绝缘系统进行电介质响应测试;建立RC弛豫模型解析变压器油纸绝缘体系的绝缘性能,并通过最佳优化方法获得模型参数。结果表明:良好的绝缘体系使得各支路绝缘电阻增大,时间常数减小。展开更多
Significant changes in spontaneous potential and exciting currents are observed during water and grout injection in a simulated porous media. Obvious correlations between the seepage flow field and the electric field ...Significant changes in spontaneous potential and exciting currents are observed during water and grout injection in a simulated porous media. Obvious correlations between the seepage flow field and the electric field in the porous media are identified.In this work, a detailed experimental study of geoelectric field variation occurring in water migration was reported by analyzing water and grout injection processes in a simulated porous media. The spontaneous potential varies linearly with the thickness of unsaturated porous media. Very interestingly, the spontaneous potential generated in the second grout injection exhibits some"memory" of previous grouting paths. The decreases in spontaneous potential observed during grout injection is very probably due to that the spontaneous potential variations are primarily caused by electro-filtration potential, as indicated by the far larger viscosity of grout compared to that of water. The geoelectric response can be utilized to effectively identify the grouting paths in water-bearing rocks.展开更多
文摘为将电介质频率响应法推广应用于变压器绝缘状态评估,利用电介质频率响应法对110 k V及220 k V油浸式变压器高压-低压套管之间的油纸绝缘系统进行电介质响应测试;建立RC弛豫模型解析变压器油纸绝缘体系的绝缘性能,并通过最佳优化方法获得模型参数。结果表明:良好的绝缘体系使得各支路绝缘电阻增大,时间常数减小。
基金Project(2013CB036003)supported by the National Basic Research,Program of ChinaProject(2010QNA54)Fundamental Research Funds for the Central Universities,ChinaProject supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions,China
文摘Significant changes in spontaneous potential and exciting currents are observed during water and grout injection in a simulated porous media. Obvious correlations between the seepage flow field and the electric field in the porous media are identified.In this work, a detailed experimental study of geoelectric field variation occurring in water migration was reported by analyzing water and grout injection processes in a simulated porous media. The spontaneous potential varies linearly with the thickness of unsaturated porous media. Very interestingly, the spontaneous potential generated in the second grout injection exhibits some"memory" of previous grouting paths. The decreases in spontaneous potential observed during grout injection is very probably due to that the spontaneous potential variations are primarily caused by electro-filtration potential, as indicated by the far larger viscosity of grout compared to that of water. The geoelectric response can be utilized to effectively identify the grouting paths in water-bearing rocks.
