基于光纤技术的SF_6断路器气室微水在线检测方法研究

Research on online moisture measurement of SF_6 breakers based on fiber optic technology

为确保SF_6断路器安全工作,基于光纤传感技术并采用红外光谱吸收法对SF_6断路器气室的微水含量(判断SF_6断路器是否安全运行的主要指标)进行在线检测。根据水汽的特征吸收光谱设计了传感系统,并采用差分系统对信号进行处理,以减小环境因素对系统检测精度的影响。此方法可实现SF_6断路器气室微水含量的准确在线检测,提高SF_6断路器的可靠性和安全性。并且该系统采用光纤进行光的传输,具有防强电磁干扰的能力。

To ensure SF6 breakers＇ safety in working, the IR spectrum absorption method was used to detect the moisture content of SF6 breakers （an important parameter for SF6 gas-insulated circuit-breakers＇ safe working） based on fiber optic technologies. A sensor system was designed according to the characteristics of the water absorption spectrum, and a differentiating system was applied to signal processing to reduce the influence of environments on the measuring precision. The proposed method can realize the online moisture measurement and improve the reliability and safety of SF6 gas-insulated circuit-breaker. This detecting system has the ability of resisting electric-magnetic interference because the optical fiber is introduced to realize the optical transmission.