Inrush Current Measurement for Transient Space Characterization and Fault Detection

Training the load identification algorithm for a power-system monitor (PSM) begins with characterization or observation of the loads. This article demonstrates a phase-controlled switch that,
in situ
, accounts for the effects of source and line impedance on load transients at controllable phase angles with respect to the ac voltage line-cycle. The phase angle significantly affects the inrush for many loads, such as lighting, induction motors, and power supplies. The circuitry and signal identification techniques presented in this article can provide a full set of training data for machine learning algorithms for power system monitoring. The system can also be used as the foundation of a “smart switch” in grid applications for automatic demand response control.