Duffing振子信号探测在故障电弧短路保护中的应用

Application of Duffing Oscillator Signal Detection to Arcing Faults Protection

Duffing振子信号检测技术利用混沌系统的分岔特性来检测外界信号,将待测信号作为Duffing方程周期策动力的摄动,利用初值敏感性可以获得很高的测量灵敏度和良好的抗噪性能。基于Duffing振子信号检测技术提出一种新型的故障电弧监测方法。在电弧没有发生燃弧之前有比较微弱的弧声信号,完全湮没在强背景噪声中,将含有噪声的弧声信号作为周期策动力加入混沌检测系统中,如果混沌检测系统处于间歇混沌状态,证明有电弧弧声产生,则故障电弧监测系统发出预警信号。实验表明,发生燃弧的瞬间,弧光、短路电流、弧声的幅值都有明显的跃变,以这3个电弧表征信息为判据,设定合适的幅值阈值,建立报警系统。实验结果表明该监测系统能实现对故障电弧的预警和报警功能。

The chaotic oscillator detection method applies the bifurcation characteristic of the driven Dulling oscillator to detect signals. The chaotic system is sensitive to certain signals and immune to noises, thus the performance is propitious to the detection sensitivity and anti-interference capability. A new method for the monitoring system of arcing fault is therefore proposed. The weak signals before arcing fault, annihilated by strong noise, are available and then the Dulling oscillator signal detection is added as the periodic disturbing force. If the monitoring system is on conditions of intermittent chaos, which proves existence of arcing sound, the arcing sound will he operated as early warning, If the arcing light and current occur simultaneously, the monitoring system will then send out warning signals of arcing fault. The system fulfills on-line detection of arcing fault and the warning and early warning are established with the arcing sound, arcing light and short-circult current, The system, furthermore, has been proved with high accuracy and quickness in terms of the experimental results.