高压发电机定子线圈抗电晕非线性材料的击穿强度增强研究

IF 1.6 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Electrical Engineering Pub Date : 2024-07-27 DOI:10.1007/s00202-024-02593-4
Zhou Yang, Minghe Chi, Xiaorui Zhang, Ruipeng Wang, Xue Sun, Qingguo Chen
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引用次数: 0

摘要

高压发电机定子线圈槽口附近的绝缘结构是典型的套管结构,容易产生电晕,对发电机的安全有决定性影响。在工程中,通常会在定子线圈槽口附近的主绝缘表面周围绑定非线性电阻防电晕带,以达到均匀电场的效果。通常,通过在防晕带中添加半导电或导电材料来增加电阻非线性。但在添加半导电或导电材料后,防电晕胶带的击穿强度往往会降低,导致无法应用非线性良好的防电晕胶带。为了同时具有良好的非线性电阻和击穿强度,本文采用环氧树脂(EP)作为基体,与一维结构的羧基功能化多壁碳纳米管(MWCNTs)和零维结构的聚苯胺(PANI)混合,得到非线性良好的材料。分别测试了非线性传导特性和击穿特性。结果表明,与 MWCNTs/EP 复合材料相比,PANI-MWCNTs/EP 复合材料具有更高的非线性系数和击穿强度。0.5wt% MWCNTs/EP 复合材料的击穿场强为 2.11 kV/mm,非线性系数为 1.41。相比之下,3wt% PANI-0.5wt% MWCNTs/EP 复合材料的击穿场强提高了 106.16%,非线性系数高达 5.32。此外,随着 PANI 掺杂量的增加,PANI-MWCNTs/EP 的非线性系数逐渐增大,击穿强度也逐渐增大。由此可见,掺杂 PANI 可以提高击穿强度,同时保持非线性材料工作场强内的电阻率变化范围。这一发现可为后续高压发生器非线性抗电晕材料的开发提供参考。
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Breakdown strength-enhancing study on anti-corona nonlinear material for high-voltage generator stator coils

The insulating structure near the slot outlet of high-voltage generator stator coils is the typical bushing structure, which is prone to corona and has a decisive impact on the safety of the generator. In engineering, nonlinear resistance anti-corona tapes are usually bound with around the main insulation surface of the stator coils near the slot, to achieve the effect of homogenizing the electric field. Usually, the resistance nonlinearity is increased by adding semi conductive or conductive materials into the anti-corona tape. However, after the process of adding semi conductive or conductive materials, the breakdown strength of anti-corona tape is often reduced, resulting in that anti-corona tapes with good nonlinear cannot be applied. In order to have both good nonlinear resistance and breakdown strength, epoxy resin (EP) is used as a matrix, which is blended with one-dimensional structured carboxyl-functionalized multi-walled carbon nanotubes (MWCNTs) and zero-dimensional structured polyaniline (PANI) to obtain nonlinearly good materials in this paper. The nonlinear conductivity characteristics and breakdown characteristics were tested separately. The results show that compared to MWCNTs/EP composite materials, PANI-MWCNTs/EP composite materials have higher nonlinear coefficients and breakdown strength. The breakdown field strength of 0.5wt% MWCNTs/EP composites is 2.11 kV/mm, and the nonlinear coefficient is 1.41. In contrast, the breakdown field strength of 3wt% PANI-0.5wt% MWCNTs/EP was increased by 106.16%, and the nonlinear coefficient is as high as 5.32. In addition, with the increase in PANI doping amount, the nonlinear coefficient of PANI-MWCNTs/EP gradually increases, and the breakdown strength also gradually increases. It can be seen that doping PANI can improve the breakdown strength while maintaining the range of resistivity variation within the nonlinear material working field strength. This discovery can provide reference for the development of nonlinear anti-corona materials for subsequent high-voltage generators.

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来源期刊
Electrical Engineering
Electrical Engineering 工程技术-工程:电子与电气
CiteScore
3.60
自引率
16.70%
发文量
0
审稿时长
>12 weeks
期刊介绍: The journal “Electrical Engineering” following the long tradition of Archiv für Elektrotechnik publishes original papers of archival value in electrical engineering with a strong focus on electric power systems, smart grid approaches to power transmission and distribution, power system planning, operation and control, electricity markets, renewable power generation, microgrids, power electronics, electrical machines and drives, electric vehicles, railway electrification systems and electric transportation infrastructures, energy storage in electric power systems and vehicles, high voltage engineering, electromagnetic transients in power networks, lightning protection, electrical safety, electrical insulation systems, apparatus, devices, and components. Manuscripts describing theoretical, computer application and experimental research results are welcomed. Electrical Engineering - Archiv für Elektrotechnik is published in agreement with Verband der Elektrotechnik Elektronik Informationstechnik eV (VDE).
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