用于局部放电探测的超声光纤传感方法

局部放电是一种有效的高压部件绝缘性能检测方法,可通过声、光及电等信号的探测来有效预报绝缘劣化程度。该文建立了基于局部放电超声信号检测的光纤传感器测试系统,使用Mach-zehnder光干涉法来检测声信号导致的光程差,测算测量回路的微小机械形变。实际测试结果表明,该系统具有高的测试灵敏度,可精确测量纳米级的机械形变,准确反映局部放电过程引起的超声信号。采用该光纤传感系统可对多层陶瓷器件的局部放电进行跟踪测量。

Ultrasonic Fiber Sensing Method for Partial Discharge Detection

The partial discharge is an effective method to detect the insulation performance of high voltage components, and the degree of insulation degradation can be effectively predicted by the detection of sound, light, electricity and other signals. The optical fiber sensor test system based on the ultrasonic signal detection method of partial discharge is set up in this paper. The Mach zehnder interferometer is used to detect the optical path difference caused by the acoustic signals and to detect the micro mechanical deformation in the measurement circuit. The practical test results show that the proposed system has a very high sensitivity, the mechanical deformation at nano scale can be accurately measured and accurately reflect the ultrasonic signals caused by partial discharge. Using this optical fiber sensing system, the partial discharge of multilayer ceramic devices can be tracked and measured.