Experimental Study on Substrate Compatibility of SF6 and SF6 Fault-Decomposing Gases with Partial Discharge Flexible UHF Antenna Sensors
Zhang Guozhi1,2,3,4, Hu Xukun1,2, Deng Guangyu1,2, Chen Kang1,2, Zhang Xiaoxing1,2,5
1. Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of Technology Wuhan 430068 China; 2. School of Electrical and Electronic Engineering Hubei University of Technology Wuhan 430068 China; 3. State Grid Electric Power Research Institute Wuhan NARI Co. Ltd Wuhan 430074 China; 4. School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China; 5. Xiangyang Industrial Institute of Hubei University of Technology Xiangyang 441100 China
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 SF6 gas 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 SF6 fault 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.
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2023, Vol. 38 
