| 引用本文: | 周利军,刘伟迪,王东阳,潘刚,李会泽,徐肖伟.基于频域介电谱法的油浸式套管受潮状态评估[J].电力自动化设备,2018,(11): |
| ZHOU Lijun,LIU Weidi,WANG Dongyang,PAN Gang,LI Huize,XU Xiaowei.Evaluation of oil-immersed bushing damp state based on frequency-domain dielectric spectroscopy[J].Electric Power Automation Equipment,2018,(11): |
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| 摘要: |
| 为了定量评估油浸式套管主绝缘受潮状态，建立了考虑直流电导的Cole-Cole双弛豫模型。对实验室制备的不同含水量(0.53%、1.78%、2.97%、3.89%、5.03%)的72.5 kV油浸式套管模型进行测试得到对应的频域介电谱，采用建立的Cole-Cole双弛豫模型对测试结果进行拟合解析，提取表征油浸式套管内绝缘含水量的特征参数，并拟合评估公式。考虑温度对现场测试结果的影响，提出了适用于现场的油浸式套管受潮状态评估方法。案例分析结果证明了所提方法的有效性。 |
| 关键词: 电力变压器 套管 绝缘 频域介电谱 Cole-Cole模型 含水量 定量评估 |
| DOI：10.16081/j.issn.1006-6047.2018.11.020 |
| 分类号:TM41 |
| 基金项目:国家自然科学基金资助项目(51877183) |
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| Evaluation of oil-immersed bushing damp state based on frequency-domain dielectric spectroscopy |
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ZHOU Lijun1, LIU Weidi1, WANG Dongyang1, PAN Gang1, LI Huize1, XU Xiaowei2
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1.School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China;2.Electric Power Research Institute, Yunnan Power Grid Co.,Ltd.,Kunming 650217, China
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| Abstract: |
| In order to quantitatively evaluate the damp state of oil-immersed bushing main insulation, the Cole-Cole double relaxation model considering DC conductivity is built. By testing 72.5 kV oil-immersed bushing model with 0.53%,1.78%,2.97%,1.78% and 5.03% moisture contents prepared in the laboratory, the corresponding frequency-domain dielectric spectroscopy is obtained. The frequency-domain dielectric spectroscopy is fitted and parsed by the Cole-Cole double relaxation model, then the characteristic parameters representing the moisture content of oil-immersed bushing insulation are extracted and the assessment formula is fitted. Considering the influence of temperature on the field testing results, the oil-immersed bushing damp state assessment method suitable for the field is proposed. Results of case analysis verify the effectiveness of the proposed method. |
| Key words: power transformers bushing insulation frequency-domain dielectric spectroscopy Cole-Cole model moisture content quantitative assessment |
