Zhang Daning, Long Guanwei, Li Yang, Mu Haibao, Zhang Guanjun
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
Polymers (Basel). 2020 May 27;12(6):1219. doi: 10.3390/polym12061219.
In order to realize the diagnosis of water distribution, this paper analyzes the interface polarization and macroscopic space charge polarization mechanism when the water distribution is non-uniform. The experimental results of this paper and bushing show that when the moisture distribution is non-uniform, there is a significant loss peak in the tan- curve. The loss peak shifts to higher frequencies as the non-uniformity coefficient increases. There are common intersection points between multiple tan- curves. Further, this paper realizes the diagnosis of the location of moisture distribution through Frequency Domain Spectroscopy (FDS) testing of different voltages and different wiring methods based on the macroscopic space charge polarization. In the single-cycle FDS test, when the positive electrode is first added to the area with higher moisture content, the amplitude of the tan- curve is smaller. The tan- curves under different wiring methods constitute a "ring-shaped" loss peak. As the voltage increases, the peak value of the loss peak shifts to the lower frequency band. As the temperature increases, the peak value of the loss peak shifts to higher frequencies. Based on the above rules and mechanism analysis, this research provides a new solution for the evaluation of moisture content of oil-immersed polymers equipment.
为实现水分分布的诊断，本文分析了水分分布不均匀时的界面极化和宏观空间电荷极化机制。本文及套管的实验结果表明，当水分分布不均匀时，tanδ曲线会出现明显的损耗峰。随着不均匀系数的增加，损耗峰向更高频率移动。多条tanδ曲线之间存在共同交点。此外，本文基于宏观空间电荷极化，通过对不同电压和不同接线方式进行频域光谱（FDS）测试，实现了对水分分布位置的诊断。在单周期FDS测试中，当正极先加在水分含量较高的区域时，tanδ曲线的幅值较小。不同接线方式下的tanδ曲线构成一个“环形”损耗峰。随着电压升高，损耗峰的峰值向更低频段移动。随着温度升高，损耗峰的峰值向更高频率移动。基于上述规律和机理分析，本研究为油浸聚合物设备水分含量评估提供了一种新的解决方案。
