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Extraction of Frequency Domain Dielectric Characteristic Parameter of Oil-paper Insulation for Transformer Condition Assessment

机译：变压器状态评估油纸绝缘频域介电特性参数的提取

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摘要

In modern power transmission and distribution systems, power transformers are critical components and their electrical properties together with service lives are determined by the insulation property of oil-paper insulation. To better apply the frequency domain spectroscopy technique to assess transformer insulation condition, a series of experiments were performed under controlled laboratory conditions. First, this article presents the frequency domain dielectric response measurement results of oil-paper insulation samples under different moisture contents and aging states, and then the extracted frequency dielectric characteristic parameters determined from the imaginary part of relative permittivity (ε_r") and dielectric dissipation factor (tanδ) curves are used to assess the moisture contents and aging states of oil-paper insulation. Finally, the quantitative relationships among dielectric characteristic parameters, moisture content, and degree of polymerization are also established. Results show that in the frequency range of 10~(-3)-10~2 Hz, ε_r" and tanδ obviously increase as the moisture content of oil-paper insulation rises, while ε_r" and tanδ are very sensitive to aging only in 10~(-3)- 10~(-1) Hz. Consequently, ε_r" and tanδ in different frequency ranges can be used to distinguish the influences of moisture content and aging state on frequency domain spectroscopy measurement results.
机译：在现代输配电系统中，电力变压器是至关重要的组件，其电气性能以及使用寿命取决于油纸绝缘的绝缘性能。为了更好地应用频域光谱技术评估变压器的绝缘状况，在受控的实验室条件下进行了一系列实验。本文首先介绍了油纸绝缘样品在不同含水量和老化状态下的频域介电响应测量结果，然后根据相对介电常数（ε_r“）和介电损耗因子的虚部确定了提取的频率介电特性参数用（tanδ）曲线评估油纸绝缘层的含水量和老化状态，最后建立介电特性参数，含水量和聚合度之间的定量关系，结果表明在10°的频率范围内〜（-3）-10〜2 Hz，随着油纸绝缘材料含水量的增加，ε_r“和tanδ明显增加，而ε_r”和tanδ仅在10〜（-3）-10〜（ -1）Hz。因此，可以使用不同频率范围内的ε_r“和tanδ来区分水分含量和老化状态对频域光谱测量的影响t结果。

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