基于电场效应的新型油纸水分平衡曲线

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery Pub Date : 2024-09-12 DOI:10.1109/TPWRD.2024.3459047

Hao Luo;Li Cheng;Zhiling Chen;Wangjun Deng;Xuetong Zhao;Lijun Yang;Ruijin Liao

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引用次数: 0

摘要

油纸水分平衡曲线（MEC-OP）是变压器设计和状态评估中常用的重要基础曲线。对于交流变压器，MEC-OP 受电场影响较弱，因此只考虑温度。然而，对于换流变压器，尚未考虑其内部存在的直流电场。因此，基于太赫兹光谱湿度分布测量的新方法，得到了考虑直流电场影响的 MEC-OP 新曲线。结果表明，油和纸张中的水分会随着电场强度的增加而增加，导致水分增加的原因可能是电场力和介电泳力的作用，同时采用分子模拟计算来辅助解释实验现象。然后，引入影响水分含量的场强系数来修正 MEC-OP，结果表明在 25 kV/mm 条件下，在 40 ℃、60 ℃ 和 80 ℃ 下计算得到的纸板水分分别增加了 15.65%、19.68% 和 32.92%。这项研究填补了直流电场对换流变压器下 MEC-OP 影响的空白，为准确计算绝缘纸中的水分提供了支持。

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A Novel Curve of Moisture Equilibrium of Oil Paper Based on the Effect of Electric Field

Moisture equilibrium curve of oil paper (MEC-OP) is an important and commonly used foundational curve in transformer design and condition assessment. For AC transformers, the MEC-OP is weakly affected by the electric field, so only considering the temperature. However, for the converter transformer, the DC electric field present inside has not yet been considered. Therefore, Based on a new method of moisture distribution measurement by terahertz spectroscopy, a novel curve of MEC-OP considering the effect of DC electric field is obtained. The results show that the moisture in oil and paper increases as the field strength grows, the reason leading to the rise of moisture may be the effect of electric field force and dielectrophoretic force, while molecular simulation calculation is employed to support in explaining the experimental phenomena. Then, the coefficient of the field strength affecting the moisture content is introduced to correct the MEC-OP, and the moisture of cardboard calculated at 25 kV/mm under 40 °C, 60 °C, and 80 °C increases by 15.65%, 19.68%, and 32.92%, respectively. This research fills a gap in the effect of DC electric field on the MEC-OP under the converter transformer and provides support for the accurate calculation of the moisture in insulating paper.

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来源期刊

IEEE Transactions on Power Delivery 工程技术-工程：电子与电气

CiteScore

9.00

自引率

13.60%

发文量

513

审稿时长

6 months

期刊介绍： The scope of the Society embraces planning, research, development, design, application, construction, installation and operation of apparatus, equipment, structures, materials and systems for the safe, reliable and economic generation, transmission, distribution, conversion, measurement and control of electric energy. It includes the developing of engineering standards, the providing of information and instruction to the public and to legislators, as well as technical scientific, literary, educational and other activities that contribute to the electric power discipline or utilize the techniques or products within this discipline.