Static energy meters are used for billing purposes of the energy consumption. Those that utilize a Rogowski coil as their current transducer have shown the highest susceptibility to conducted electromagnetic interference resulting in misreadings. These disturbances occur due to pulsed currents with steep slopes with higher frequency content, drawn by nonlinear household appliances. This has resulted in over- and underestimations of the energy bill, and even in a perceived energy generation. This article describes improving the robustness against conducted electromagnetic interference by using the orthogonality of power flow principle, thus focusing only on the fundamental, in contrary to the energy metering trend of increasing the measurement bandwidth. A first-order low-pass filter is implemented between the current transducer and the amplifier to reduce interference without affecting the 50 Hz signal. The results show a reduction of errors from 1632% down to below 2.5%.

中文翻译：

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使用模拟低通滤波器提高静态电能表对传导 EMI 的鲁棒性


静态电能表用于能源消耗的计费目的。那些使用 Rogowski 线圈作为电流传感器的传感器对传导电磁干扰的敏感性最高，从而导致读数错误。这些干扰是由于非线性家用电器绘制的具有较高频率成分的陡峭斜率的脉冲电流而发生的。这导致了对能源账单的高估和低估，甚至导致了对能源发电的感知。本文介绍了通过使用潮流正交性原理来提高抗传导电磁干扰的鲁棒性，从而只关注基本面，这与增加测量带宽的电能计量趋势相反。在电流传感器和放大器之间实现一阶低通滤波器，以减少干扰，而不会影响 50 Hz 信号。结果显示，误差从 1632% 减少到 2.5% 以下。