监测前端提供工业系统实时功率检查

　　监测前端提供工业系统实时功率检查

　　电力线完整性已成为工业和医疗设备设计的一个重要方面。许多过程现在依赖于传感器的输入，容易受到噪声和干扰的实时监测。电瞬变很容易扰乱精密测量。如果这些条件没有得到补偿，不正确的读数可能会导致闭环控制回路遭受像差或系统丢失重要的安全相关的信号。

　　其结果是，某些形式的交流线路监测已成为一个重要的额外的传感器输入，以确保瞬变和其他电力线扭曲不影响设备。电力线监测可以用来确保其他高功率设备使用的电源转换器正常工作，不注入不必要的谐波或呈现不平衡负载到电网，这可能会破坏电力输送。用户还可以使用数据来确定进程是否需要优化，以减少整个工厂的功耗使用热点跟踪整个能源消耗。

　　Most AC line monitor designs use one or more analog-to-digital converters （ADCs） to convert power line signals into a digital format and then apply digital signal processing using a local processor to derive useful operating parameters such as peak and average power output， power factor angle， harmonic voltage amplitude and line frequency.

　　The key question over designing an AC line monitoring subsystem is to determine which types of measurement are important as these will influence the choice of ADC used to sample the inputs， as well as the number of input channels. For example， a three-phase monitor used to determine harmonic distortion will need to sample both voltage and current for a total of four phases， resulting in a requirement for eight ADC input channels. The fourth phase that needs to be sampled is the neutral line： this will show current flowing if the main phases are unbalanced.