基于光纤传感技术的局部放电超声信号检测方法研究

电力设备局部放电易引发电气短路故障,传统的电检测方法针对单点测量,在长距离测量上受到局限.分析了局部放电的参数特征,设计了一种检测局部放电信号的光纤环结构,并构建了基于Sagnac干涉原理的光纤传感局部放电检测方案.在实验室环境下模拟电力设备局部放电,搭建了局部放电光纤检测系统,传感光纤总长度为8.398 km,进行局部放电检测试验.试验证明,在10 kV电压等级下,局部放电时域信号幅值范围为0.1 V~1.8 V,频率响应范围为可达60 kHz,研究表明该方法具有灵敏度高、频率响应范围宽等特点,为电力设备局部放电检测提供了新的思路.

Study on Partial Discharge Ultrasonic Signal Detection Method Based on Optical Fiber Sensing Technology

The partial discharge of power equipment can easily cause electrical short-circuit fault and the traditional e-lectrical measurement for single-point measurement has limitations in the long-distance measurement.The characteris-tics of partial discharge are analyzed,a kind of fiber ring structure is designed and a partial discharge detection scheme based on the interference principle of Sagnac is constructed. In the laboratory environment,the partial dis-charge of the power equipment is simulated and a partial discharge optical fiber detection system is built. The partial discharge detection is carried out on the fiber with the total fiber length of 8.398 km. The experimental results show that the amplitude of partial discharge is between 0.1 V~1.8 V and the frequency response range is up to 60 kHz at 10 kV voltage level.The research shows that the method has the characteristics of high sensitivity and wide frequency re-sponse range,which provides a new idea for partial discharge detection of power equipment.