SF<sub>6</sub>及SF<sub>6</sub>故障分解气体与局部放电柔性特高频天线传感器基底相容性实验研究

doi:10.19595/j.cnki.1000-6753.tces.222358

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摘要采用柔性内置特高频（UHF）天线传感器是解决气体绝缘组合电器（GIS）内部潜伏性局部放电（PD）绝缘缺陷微弱高频电磁波信号感知的有效方法,而柔性UHF天线传感器基底材料和SF₆及其故障分解气体之间的相容是实现柔性UHF天线传感器内置于GIS的关键。基于此,该文通过搭建SF₆及其故障分解气体与PD柔性UHF天线传感器基底相容性实验平台,结合GIS实际运行环境温度,开展了多种常用PD柔性UHF天线传感器基底材料与SF₆及其故障分解气体相容性实验研究,利用傅里叶变换红外光谱仪、气相色谱质谱联用仪、扫描电镜、X射线光电子能谱仪分别从SF₆气体成分侧、柔性基底表面形貌及元素变化情况侧进行测试分析。实验发现,聚酰亚胺（PI）、聚对苯二甲酸乙二醇酯（PET）和聚二甲基硅氧烷（PDMS）三种常用PD柔性UHF天线传感器基底材料均不会对SF₆气体成分造成影响;常用的PI柔性UHF天线传感器基底会与SF₆故障分解气体中的SOF₂发生反应,导致SOF₂含量明显减少;PET在纯SF₆最高允许运行温度110℃条件下会发生轻微氧化;PI、PET两种PD柔性UHF天线传感器基底表面均会生成较多的含氟化合物;在研制柔性UHF天线传感器时宜选用PDMS基底。研究成果对GIS柔性内置UHF天线传感器的设计和应用具有重要的参考价值。

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关键词 ：柔性特高频天线传感器, 气体绝缘组合电器（GIS）, 柔性基底, 相容性

Abstract：At present, rigid base ultra high frequency (UHF) antenna sensors are widely used for the detection of partial discharge (PD) from insulation defects in gas-insulated switchgear (GIS) in substations, but there are problems with rigid base UHF antenna sensors such as destruction of the internal electric field distribution of the equipment and complex installation. The flexible substrate UHF antenna sensor can effectively avoid the above problems. However, it is not clear whether the flexible substrate of the built-in flexible UHF antenna sensor is compatible with SF₆ and SF₆ fault decomposition gas, and which flexible substrate of the built-in flexible UHF antenna sensor is more compatible with SF₆ and SF₆ fault decomposition gas. Therefore, this paper investigates the compatibility of SF₆ and SF₆ fault decomposition gas with three common PD flexible UHF antenna sensor substrates: polyimide (PI), polyethylene terephthalate (PET) and polydimethylsiloxane (PDMS).
By building an experimental platform for the compatibility of SF₆gas and SF₆ fault decomposition gas with the substrate of PD flexible UHF antenna sensor, this paper carried out an experimental study on the compatibility of various commonly-used PD flexible UHF antenna sensor substrate materials with SF₆ and SF₆fault decomposition gas combined with the actual operating temperature range of GIS. Fourier transform infrared spectrometer (FTIR) and gas chromatography-mass spectrometry (GC-MS) were used to analyze the changes of gas composition before and after the experiments. And scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) were used to analyze the changes in the surface and elements of the PD flexible UHF antenna sensor substrate before and after the experiments.
The results are as follows: first, according to the results of FTIR and GC-MS tests, the pure SF₆ gas doesn’t react with the three PD flexible UHF antenna sensor substrates. However, the three PD flexible UHF antenna sensor substrates do react with SOF₂ in the SF₆ fault decomposition gas, among which the PI material reacts most strongly with SOF₂. Second, the SEM and XPS tests show that in the PET material, the absorption peaks of C=O and O—C—O bonds in the pure SF₆ environment at 110℃ are higher than those of C=O and O—C—O bonds in the pure SF₆ environment at 30℃ and 70℃, while C=O and O—C—O bonds are also detected in the PET material under the vacuum condition at 110℃; all three PD flexible UHF antenna sensor substrates generates fluorinated compounds on the surface under the SF₆ fault decomposition gas environment, but on the surface of PDMS material, the peak intensities of Metal—F and C—F bonds were much lower than those of Metal—F and C—F bonds on the surface of PI and PET materials.
From the above results, it can be concluded that all three commonly used PD flexible UHF antenna sensor substrate materials, PI, PET and PDMS, do not affect the SF₆ gas composition; the commonly used PI flexible UHF antenna sensor substrate react with SOF₂ in SF₆ fault decomposition gas, resulting in a significant reduction of SOF₂ content; PET is be slightly oxidized under pure SF₆ maximum allowable operating temperature of 110°C. Two PD flexible UHF antenna sensor (PI and PET) generate more fluorinated compounds. Therefore, PDMS substrate should be adopted in the development of flexible UHF antenna sensor. The results of this research provide basic reference data for the design and application of GIS flexible built-in UHF antenna sensors.

Key words： Flexible UHF antenna gas-insulated switchgear (GIS) flexible base compatibility

收稿日期: 2022-12-23

PACS:

TM213

基金资助:国家自然科学基金项目（52107144）和湖北省教育厅科技项目（Q20211401）资助

通讯作者: 张晓星男,1972年生,教授,博士生导师,研究方向为高压电气设备绝缘在线监测与状态评估、新型传感技术和环保型气体绝缘材料等。E-mail：xiaoxing.zhang@outlook.com

作者简介: 张国治男,1990年生,博士,副教授,研究方向为电气设备在线监测和状态评估等。E-mail：980064212@qq.com

引用本文:

张国治, 胡栩焜, 邓广宇, 陈康, 张晓星. SF₆及SF₆故障分解气体与局部放电柔性特高频天线传感器基底相容性实验研究[J]. 电工技术学报, 2023, 38(15): 4050-4062. Zhang Guozhi, Hu Xukun, Deng Guangyu, Chen Kang, Zhang Xiaoxing. Experimental Study on Substrate Compatibility of SF₆ and SF₆ Fault-Decomposing Gases with Partial Discharge Flexible UHF Antenna Sensors. Transactions of China Electrotechnical Society, 2023, 38(15): 4050-4062.

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