GE DS200SHVIG1B数字量控制板卡
对于故障诊断，如检测过小的中性线，需要谐波额定变压器或谐波滤波器的有效性；谐波频谱的详细信息可用于PQM和EnerVista PQM设置。EnerVista PQM设置程序可通过将PQM置于高速采样模式（256个采样/周期）对四个电流输入中的任何一个或三个电压输入中的任意一个进行谐波分析，在该模式下，PQM将对用户定义参数的一个周期进行采样。EnerVista PQM安装程序然后获取该数据并执行FFT（快速傅里叶变换）以提取谐波信息。谐波分析功能在EnerVista PQM设置中实现，如下所示。Z选择“实际”>“功率分析”>“谐波分析”菜单项。Z选择所需的输出类型：波形或频谱格式。
For fault diagnosis such as detecting undersized neutral wiring, need for a harmonic rated transformer or effectiveness of harmonic filters; details of the harmonic spectrum are useful and available with the PQM and EnerVista PQM Setup. EnerVista PQM Setup can perform a harmonic analysis on any of the four current inputs or any of the three voltage inputs by placing the PQM in a high speed sampling mode (256 samples/cycle) where it will sample one cycle of the user defined parameter. EnerVista PQM Setup then takes this data and performs a FFT (Fast Fourier Transform) to extract the harmonic information. The harmonic analysis feature is implemented into EnerVista PQM Setup as shown below. Z Select the Actual > Power Analysis > Harmonic Analysis menu item. Z Select the desired output type: Waveform or Spectrum format.
