油纸绝缘频域介电谱特性与聚合度的关联影响规律研究

Study of Linkage Effects Between Degree of Polymerization and Frequency Domain Dielectric Spectroscopy Characteristics of Oil-Paper Insulation

为研究绝缘纸聚合度与油纸绝缘频域介电谱特性间的关联影响规律,搭建了油纸绝缘频域介电响应测试平台,测试了新绝缘油、低含酸量绝缘油、高含酸量绝缘油、一定老化程度绝缘油分别与不同聚合度绝缘纸所组成的油纸绝缘的复介电常数以及新绝缘油分别与低含水量、高含水量绝缘纸组成的油纸绝缘的复介电常数,并对测试结果进行了对比分析。分析结果表明:绝缘纸聚合度通过影响水分和酸在油纸间的分布情况而对油纸绝缘复介电常数产生关联性影响。利用频域介电谱法诊断油纸绝缘中水分或小分子酸含量时,应考虑聚合度影响两者在油纸间的分布情况后对油纸绝缘频域介电谱特性产生的关联性影响。

In order to study the linkage effects between degree of polymerization（DP） and frequency domain dielectric spectroscopy characteristics of oil-paper insulation, the frequency domain dielectric response test platform of oil- paper insulation is set up. Complex permittivity of oil-paper insulation respectively composed by new or aged oil and insulation paper with different DP are tested, and complex permittivity of oil-paper insulation respectively composed by oil with low or high acid content and insulation paper with different DP are tested, and complex permittivity of oil-paper insulation respectively composed by new oil and insulation paper with different DP and low or high moisture content are tested. The test results are analyzed, and the analysis results show that the degree of polymerization of insulation paper has a linkage effect on complex permittivity of oil-paper insulation through influencing the distribution of moisture and acids between oil and paper. When the frequency domain dielectric spectroscopy is used to diagnose the moisture or acids content in oil-paper insulation, it should be considered that the effect of DP on the distribution of moisture and acids between oil and insulation paper has a linkage impact on the frequency domain dielectric spectroscopy characteristics of oil-paper insulation.