电缆端头周围的直流磁场测量

M. Saltzer, B. Kallstrand, K. Johansson, D. Borg, J. Schiessling, C. Doiron
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引用次数: 2

摘要

即使在无电晕条件下,绝缘结构(材料)也可能在直流磁场中带电。这是因为空气的离子电导率是有限的。空气的有限导电性是由背景无线电活动和宇宙辐射产生的电荷造成的。地面上典型的离子浓度为107到1010个离子/立方米,这导致电导率在10-16到10-13 S/m之间。采用端接高压交联聚乙烯电缆的端部作为绝缘结构进行了实验研究。在-140 kV直流电压下,用旋转场探头测量剥离电缆端周围的场分布。测量结果与没有特别考虑空间电荷效应的模拟结果进行了比较。观察到一个很大的差异,表明在模拟受空气影响的高压直流绝缘元件时考虑空间电荷效应的相关性。
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DC field measurements around a cable end
Even under corona-free conditions, insulating structures (materials) may be charged in DC fields. This is due to the fact that air has a finite ionic conductivity. The finite conductivity of air results from charges generated by background radio activity and cosmic radiation. Typical ion concentrations on ground are 107 to 1010 ions/m3 which leads to conductivities ranging from 10-16 to 10-13 S/m. An experiment has been conducted where the end of a terminated high voltage XLPE cable was used as an insulating structure. The field distribution around the stripped cable end was measured with an applied DC voltage of -140 kV using a rotating field probe. The measurements are compared to simulations, which do not specifically take into account space charge effects. A big discrepancy is observed, showing the relevance of taking into account space charge effects when modeling HVDC insulation components subjected to air.
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