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在绝缘油纸接口的电双层的探测和调制

Lu Gao¹, Yuqi Chen¹, Zepeng Lv¹

¹State Key Laboratory of Electric Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, P. R. China.

Langmuir : the ACS journal of surfaces and colloids

|November 28, 2023

概括

在绝缘油纸系统中了解电荷积累对于高压直流转换器变压器至关重要. 凯尔文探测器力显微镜揭示了像ATA这样的添加剂如何减少电荷积累并提高运行安全.

科学领域:

电气工程电气工程
材料科学材料科学材料科学
物理物理学物理

背景情况:

绝缘油纸系统中的电荷积累对于高压直流 (HVDC) 转换器变压器的操作安全至关重要.
在油纸接口的电双层 (EDL) 内精确的电荷分布及其对电荷传输的影响仍然不太清楚.
调查EDL机制对于提高绝缘性能和防止变压器故障至关重要.

研究的目的:

探测和理解EDL在绝缘油纸接口上的电荷分布.
研究添加剂在改变EDL特性和减轻电荷积累方面的作用.
为了建立EDL特性和充电运输之间的关系,以提高绝缘可靠性.

主要方法:

凯尔文探针力显微镜 (KPFM) 用于可视化和分析油纸接口上的电荷分布.
在含有添加剂和不含添加剂的油纸系统中对EDL特性进行比较分析.
在不同条件下评估电荷传输动态和散射率.

主要成果:

没有添加剂,负电荷会积聚在纸面上,正电荷会扩散到油中,形成接口屏障.
添加剂3-amino-2,4-triazole (ATA) 通过引入孔陷有效调整EDL,显著降低接口屏障并减少电荷积累.
ATA增强了油纸绝缘中的电荷移动性,并加速了电荷散射,改善了极性逆转期间的操作稳定性.

结论:

油和纸之间的电子亲和力差异决定了EDL内在的电荷分布,这对电荷传输构成了挑战.
ATA作为一个关键的添加剂,优化EDL特性,以减少接口障碍和减轻HVDC绝缘中电荷积累.
这些发现为开发先进的油纸绝缘系统提供了一条道路,为转换器变压器提供了增强的电荷散射和运行稳定性.

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