The conductivity of insulating oils-II
The conductivity of insulating oils-II
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绝缘油的电导率-II
DOI：
10.1109/t-aiee.1931.5055853
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发表时间：
1931
期刊：
影响因子：
--
通讯作者：
J. B. Whitehead
中科院分区：
文献类型：
--
作者：
J. B. Whitehead
本文描述了高等级变压器油中充电电流和其他相关现象的实验。研究了消除初始瞬态后在施加连续电压的百分之几秒内剩余的充电电流。在不同时间获得的同一油的两个样品截然不同。在一种情况下，充电电流从一开始就下降，而在另一种情况下，充电电流在相当长的时间内保持恒定，甚至暂时增加。长时间充电后极性反转时，两个样本的初始电流与反转前相同，但其中一个样本在几秒钟后出现瞬间大幅增加。给出了初始状态恢复时间的证据。显示了带电油中空间电荷的存在，并测量了这些电荷的形成时间以及由此产生的不均匀电压分布。充电电流在其早期阶段的重要性被强调，因为它是决定交流的初始电导率。损失。附录中对空间电荷的影响进行了理论讨论。结果表明，至少在定性上这些解释了观察到的现象。
The paper describes experiments on the charging current and other associated phenomena in high grade transformer oil. The charging currents remaining after the elimination of the initial transient were studied to within a few hundredths second of application of continuous voltage. Two samples of the same oil obtained at different times differed radically. In one case the charging current fell off from the start, while in the other it remained constant for an appreciable time or even temporarily increased. On reversal of polarity after a long charge the initial current with both specimens was the same as before reversal, but with one a large momentary increase occurred a few seconds later. Evidence is given on the time of recovery of the initial condition. The existence of space charges in the charged oil is shown, and the time of formation of these charges together with the resulting non-uniform distribution of voltage is measured. The importance of the charging current in its early stages is emphasized, since it is the initial conductivity which determines the a-c. loss. In an appendix a theoretical discussion is given on the influence of the space charges. It is shown that at least qualitatively these account for the observed phenomena.