基于飞秒激光引导高压放电的SF6分解物原位检测

气体绝缘开关设备(GIS)绝缘缺陷引发的放电会导致SF₆分解，分解产生的低氟硫化物与设备内的微量H₂O和O₂反应生成具有腐蚀性的物质，影响设备正常运行，因此，研究SF₆分解机理对GIS的安全运行具有重要意义。由于部分分解物在采样过程中发生转化，因此，实现SF₆分解物的原位检测对于研究SF₆分解机理是十分必要的。采用飞秒激光引导高压放电实现了高压放电空间和时间的精确控制，并利用飞秒激光引导高压放电产生的空间分辨光谱实现了SF₆分解物的原位测量。首先研究证明了飞秒激光不会引起SF₆的分解；其次，利用飞秒激光产生的等离子体通道实现了放电空间和时间的精确控制；最后，发现分解物中包含由于高能电子碰撞直接或间接产生的大量S和F的离子和原子。研究证明了基于飞秒激光引导高压放电可以实现SF₆分解物的原位检测，为开展高压放电下SF₆分解机理研究提供了一种新的研究手段。

In-Situ Detection of SF6 Decomposition Products Based on Femtosecond Laser-Guided High-Voltage Discharge

The occurrence of discharge due to insulation defects in gas insulated switchgear(GIS)can cause decomposition of SF₆.The low-fluoride sulfide species produced by the decomposition react with trace amounts of H₂O and O₂ in the equipment to produce corrosive substances,which affect the normal operation of the equipment.Thus,it is of great significance to study the decomposition mechanism for the safe operation of GIS.Some decomposition products are transformed in the process of sampling.Hence,it is necessary to realize the in-situ detection of SF₆ decomposition products to study the mechanism of SF₆ decomposition.Femtosecond laser-guided high-voltage discharge technology was proposed to achieve the precise control of the space and time of high-voltage discharge,and the in-situ measurement of SF₆ decomposition products was achieved by using space-resolved spectrum generated by femto second laser-guided high-voltage discharge in our work.In this paper,firstly,the decomposition of SF₆ is not caused by femtosecond laser.Secondly,the precise control of discharge space and time is achieved by using the plasma channel generated by femtosecond laser.Finally,it is found that the decomposition contains a large number of S and F ions and atoms that are directly or indirectly generated by high-energy electron collisions.The research proves that in-situ detection of SF₆ decomposition products can be achieved based on femtosecond laser-guided high-voltage discharge,which provides a new research method for the study of SF₆ decomposition mechanism under high-voltage discharge.