基于光子晶体光纤的局部放电检测

Partial discharge detection based on photonic crystal fibers

局部放电检测对于保障高压电力系统的安全运行至关重要。本文提出了一种针对高压设备局部放电检测的表面等离子体共振D型光子晶体光纤传感器,该方案采用一种光致变色凝胶作为敏感单元,用于感知局部放电所产生的紫外线辐射。该凝胶的折射率会随辐射强度的变化而变化,从而影响光纤纤芯和表面等离激元模式之间的耦合共振波长。通过全矢量有限元法对传感器的性能进行了理论和仿真分析,并对传感器的几何参数进行了研究,以优化传感器的灵敏度,最后进行了实验验证。结果表明所设计传感器的灵敏度值可达2.4 nm/mW·cm^(-2)。该传感器结构简单、成本低廉,为光纤局部放电传感的研究提供了参考。

Partial discharge detection is crucial to ensure the safe operation of high-power systems.In this paper,a surface plasmon resonance D-type photonic crystal fiber sensor for partial discharge detection in high-voltage equipment is proposed,and the scheme employs a photochromic gel as a sensitive unit for sensing the ultraviolet radiation generated by partial discharges.The refractive index of the gel varies with the radiation intensity,affecting the coupling resonance wavelength between the fiber core and the surface plasmon modes.The performance of the sensor is analyzed theoretically and simulated firstly by the full vector finite element method,then the geometric parameters of the sensor are studied to optimize the sensitivity of the sensor,and experimental verification is carried out finally.The results show that the sensitivity value of the designed sensor can reach up to 2.4 nm/mW·cm^(-2).The simple structure and low cost of the sensor provide a reference for the study of fibre optic partial discharge sensing.