研究固体分解产物是探明SF_(6)断路器金属有机材料腐蚀机制的重要科学手段。文中以40.5 k V SF_(6)断路器为实验对象,研究了不同电流大小、极性、开断次数下触头和喷口本体材料电热腐蚀程度的影响。开断实验后对断路器进行解体发现,大...研究固体分解产物是探明SF_(6)断路器金属有机材料腐蚀机制的重要科学手段。文中以40.5 k V SF_(6)断路器为实验对象,研究了不同电流大小、极性、开断次数下触头和喷口本体材料电热腐蚀程度的影响。开断实验后对断路器进行解体发现,大电流开断导致动静弧触头的腐蚀,正极性开断加速了动弧触头的腐蚀,在触头表面及灭弧室底部有固体分解产物产生。利用扫描电子显微镜(SEM)、X射线能谱(EDS)、粉末晶体衍射(XRD)技术分析了固体分解产物的化学组成,发现触头表面固体分解产物包括Cu_(2)O、Cu_(2)S、无定型碳单质和碳氟烃沉积物,灭弧室底部固体分解产物包括CuF_(2)、Cu_(2)O、SiO_(2)和聚四氟乙烯粉末。实验结果表明,触头表面与灭弧室固体分解产物的组成差异主要源自碳、氟、铜等元素迁移途径不同。触头表面腐蚀劣化主要由碳化、氧化、硫化引起;喷口腐蚀劣化主要由聚四氟乙烯的蒸发流失造成。展开更多
The flashover performance of insulating materials plays an important role in the development of high-voltage insulation systems.In this paper,silicone rubber(SIR)is modified by CF4 radio frequency capacitively coupled...The flashover performance of insulating materials plays an important role in the development of high-voltage insulation systems.In this paper,silicone rubber(SIR)is modified by CF4 radio frequency capacitively coupled plasma(CCP)for the improvement of surface insulation performance.The discharge mode and active particles of CCP are diagnosed by the digital single-lens reflex and the spectrometer.Scanning electron microscopy and x-ray photoelectron spectroscopy are used for the surface physicochemical properties of samples,while the surface charge dissipation,charge accumulation measurement,and flashover test are applied for the surface electrical characteristics.Experimental results show that the fluorocarbon groups can be grafted and the surface roughness increases after plasma treatment.Besides,the surface charge dissipation is decelerated and the positive charge accumulation is inhibited obviously for the treated samples.Furthermore,the surface flashover voltage can be increased by 26.67%after 10 min of treatment.It is considered that strong electron affinity of C–F and increased surface roughness can contribute to deepening surface traps,which not only inhibits the development of secondary electron emission avalanche but also alleviates the surface charge accumulation and finally improves the surface flashover voltage of SIR.展开更多
文摘研究固体分解产物是探明SF_(6)断路器金属有机材料腐蚀机制的重要科学手段。文中以40.5 k V SF_(6)断路器为实验对象,研究了不同电流大小、极性、开断次数下触头和喷口本体材料电热腐蚀程度的影响。开断实验后对断路器进行解体发现,大电流开断导致动静弧触头的腐蚀,正极性开断加速了动弧触头的腐蚀,在触头表面及灭弧室底部有固体分解产物产生。利用扫描电子显微镜(SEM)、X射线能谱(EDS)、粉末晶体衍射(XRD)技术分析了固体分解产物的化学组成,发现触头表面固体分解产物包括Cu_(2)O、Cu_(2)S、无定型碳单质和碳氟烃沉积物,灭弧室底部固体分解产物包括CuF_(2)、Cu_(2)O、SiO_(2)和聚四氟乙烯粉末。实验结果表明,触头表面与灭弧室固体分解产物的组成差异主要源自碳、氟、铜等元素迁移途径不同。触头表面腐蚀劣化主要由碳化、氧化、硫化引起;喷口腐蚀劣化主要由聚四氟乙烯的蒸发流失造成。
基金supported by National Natural Science Foundation of China(Nos.11775175,U1766218,51827809)Natural Science Research Fund of Higher Education of Anhui Province(No.KJ2020A0246)。
文摘The flashover performance of insulating materials plays an important role in the development of high-voltage insulation systems.In this paper,silicone rubber(SIR)is modified by CF4 radio frequency capacitively coupled plasma(CCP)for the improvement of surface insulation performance.The discharge mode and active particles of CCP are diagnosed by the digital single-lens reflex and the spectrometer.Scanning electron microscopy and x-ray photoelectron spectroscopy are used for the surface physicochemical properties of samples,while the surface charge dissipation,charge accumulation measurement,and flashover test are applied for the surface electrical characteristics.Experimental results show that the fluorocarbon groups can be grafted and the surface roughness increases after plasma treatment.Besides,the surface charge dissipation is decelerated and the positive charge accumulation is inhibited obviously for the treated samples.Furthermore,the surface flashover voltage can be increased by 26.67%after 10 min of treatment.It is considered that strong electron affinity of C–F and increased surface roughness can contribute to deepening surface traps,which not only inhibits the development of secondary electron emission avalanche but also alleviates the surface charge accumulation and finally improves the surface flashover voltage of SIR.
