Interface Charge Overshoot in Vegetable Oil–Paper Insulation Under DC Voltage

IF 2.9 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-07-01 DOI:10.1109/TDEI.2024.3421169
Lu Gao;Hao Xu;Zepeng Lv;Kai Wu
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Abstract

Oil-paper insulation is the primary insulation material utilized in transformers, including converter transformer. As an environmentally friendly liquid dielectric, vegetable insulating oil is considered a good substitute for mineral insulating oil, but it still lacks application in converter transformers. Converter transformers mostly use multiple layers of insulating paper and insulating oil, leading to the existence of oil-paper interfaces. In the vegetable oil-paper sample, there is an overshoot phenomenon of charge accumulation at the oil-paper interface under the applied dc voltages. Owing to discrepancy in the mobility of injected charges and ionization charges, the initial equilibrium value of the interface charge is 12%–36% higher than the final equilibrium value. Due to the existence of the interface barrier, the interface charges remain at the high initial equilibrium value for a long time before decreasing to the final equilibrium value, which may potentially lead to the risk of partial discharge. Mitigating the fiber defects in the insulating paper aids in reducing the interface barrier and enabling charges that migrate to the vicinity of the oil-paper interface to cross the interface easily and recombine with the heteropolar charge on the other side, which not only facilitates the faster attainment of the final equilibrium value of interface charge under dc voltage but also enables the rapid dissipation of the accumulated charge shortly after the removal of the applied voltage. This characteristic is beneficial to the operation stability of converter transformers, especially in the condition of polarity inversion.
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直流电压下植物油-纸绝缘的界面电荷过冲
油纸绝缘是变压器(包括换流变压器)的主要绝缘材料。植物绝缘油作为一种环保的液态电介质,被认为是矿物绝缘油的良好替代品,但在变流器变压器中仍缺乏应用。换流变压器大多使用多层绝缘纸和绝缘油,因此存在油纸界面。在植物油纸样品中,在施加直流电压时,油纸界面会出现电荷积累的过冲现象。由于注入电荷和电离电荷的迁移率不同,界面电荷的初始平衡值比最终平衡值高 12%-36%。由于存在界面势垒,界面电荷在降低到最终平衡值之前,会在较高的初始平衡值上停留很长时间,这有可能导致局部放电的风险。减少绝缘纸中的纤维缺陷有助于降低界面障碍,使迁移到油纸界面附近的电荷能够轻松穿过界面,并与另一侧的异极电荷重新结合,这不仅有利于在直流电压下更快地达到界面电荷的最终平衡值,还能使累积的电荷在去掉外加电压后不久迅速消散。这一特性有利于变流器变压器的运行稳定性,尤其是在极性反转的情况下。
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来源期刊
IEEE Transactions on Dielectrics and Electrical Insulation
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.
期刊最新文献
Table of Contents IEEE Transactions on Dielectrics and Electrical Insulation Publication Information Editorial Electrets and Related Phenomena IEEE Transactions on Dielectrics and Electrical Insulation Information for Authors IEEE Dielectrics and Electrical Insulation Society Information
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