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An embedded system for AC series arc detection by inter-period correlations of current

机译:一种通过电流的周期相关性进行交流串联电弧检测的嵌入式系统

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This paper presents a method for detecting series arcs for a 230V AC-50 Hz residential installation, its implementation in an embedded circuit and its performance under real conditions. First, we evaluated the inter-period autocorrelation coefficient r of the line current. The algebraic estimation of the derivative of the signal r was then used to obtain an indicator of arc detection. r was calculated on the current at a sampling rate frequency of 5 kHz and the 50 Hz component was attenuated by an high pass (HP) filter. Tests carried out with domestic appliances with different power loads (resistive load, lamp, vacuum cleaner, dimmer etc) show a value for r which is very stable and close to 1 under normal conditions. The coefficient r weakens in the presence of an arc (initiated by a carbon path) and is no longer constant. The complete algorithm was implemented in real time on a 32-bit ARM Cortex-M3 microcontroller with a 12-bit ADC. The measuring current, which ranges from 0 to more than 20 A, was provided by a passive toroidal inductive probe. Four typical household loads were tested. The results obtained show that detection is operative and very fast (10 ms) with currents which exceed 400 mA. (C) 2015 Elsevier B.V. All rights reserved.
机译:本文提出了一种用于检测230V AC-50 Hz住宅安装中的串联电弧的方法,其在嵌入式电路中的实现以及在实际条件下的性能。首先,我们评估线电流的周期间自相关系数r。信号r的导数的代数估计然后用于获得电弧检测的指标。 r是在5 kHz采样率频率下的电流上计算得出的,并且50 Hz分量被高通(HP)滤波器衰减。使用具有不同功率负载(电阻负载,灯,真空吸尘器,调光器等)的家用电器进行的测试显示,r的值非常稳定,在正常情况下接近1。系数r在存在电弧(由碳路径引发)的情况下减弱,并且不再恒定。完整算法是在具有12位ADC的32位ARM Cortex-M3微控制器上实时实现的。测量电流范围为0至大于20 A,由无源环形电感式探头提供。测试了四种典型的家庭负载。所获得的结果表明,在电流超过400 mA时,检测是有效且非常快速的(10 ms)。 (C)2015 Elsevier B.V.保留所有权利。

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