Hump Phenomenon-Based Aging Estimation of Liquid Insulation Used in HV Transformer

IF 3.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-06-16 DOI:10.1109/TDEI.2025.3580076

S. K. Paul;B. Chakraborty;S. Maur;A. K. Pradhan

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引用次数: 0

Abstract

In this study, aging impact analysis on dielectric behavior of mineral oil (MO), natural and synthetic ester (SE) is performed and their aging status is estimated using the hump phenomenon obtained from dielectric modulus spectrum. For this purpose, equivalent aging of 5, 10, 15, and 20 years of each oil is emulated by mixing formic, acetic, and levulinic acid with mineral and ester oils. Thereafter, Fourier transform infrared spectroscopy and frequency-domain spectroscopy (FDS) are conducted on the prepared aged samples to assess the impact of aging on physicochemical alteration and low-frequency interfacial polarization characteristics at different temperatures, respectively. Based on the FDS results, dielectric modulus spectrum is obtained, from which hump phenomenon is identified. Besides, another important factor, i.e., conduction dominance factor (CDF), is introduced to quantitatively investigate the dominance of conduction mechanism over relaxation polarization. Based on the experimental results, a correlation with the aging status of liquid insulation with the three aging sensitive parameters (hump frequency, hump peak, and CDF) is established, which can reliably be used for estimation of their aging status.

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基于驼峰现象的高压变压器液体绝缘老化估计

本研究对矿物油（MO）、天然酯和合成酯（SE）的介电性能进行了老化影响分析，并利用介电模量谱得到的驼峰现象估计了它们的老化状态。为此，通过将甲酸、乙酸和乙酰丙酸与矿物油和酯油混合，模拟每种油的等效老化5年、10年、15年和20年。然后，对制备的时效样品进行傅里叶变换红外光谱和频域光谱（FDS）分析，分别评估时效对不同温度下的理化变化和低频界面极化特性的影响。根据FDS结果，得到了介质模量谱，并从中识别出驼峰现象。此外，引入另一个重要因素传导优势因子（CDF）来定量考察传导机制对弛豫极化的优势。根据实验结果，建立了液体绝缘老化状态与三个老化敏感参数（驼峰频率、驼峰峰和CDF）的相关性，可可靠地用于液体绝缘老化状态的估计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程：电子与电气

CiteScore

6.00

自引率

22.60%

发文量

309

审稿时长

5.2 months

期刊介绍： Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.