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I recall an energy management, home automation project developed (I think) by students at Carnegie-Mellon, where one current transformer was installed on each leg of the main power panel (240 VAC, split-phase, in a normal home) then each light or appliance to be controlled was switched on and the resulting voltage change (delta V) from the current transformers were read and recorded, using Analog Digital Converters. The real-time, data stream was subsequently monitored by a computer program, which was instructed to recognize individual devices by the delta V, calculate total current (and resulting power) and based on programmed logic priorties, commanded PLC relays to turn certain devices off and on, to reduce load at certain critical times to reduce demand. This practice in energy management is called load scheduling or load leveling. I am presently using Onset CTs and HOBO data logger for ADC and data recording, via both DB9 serial port or USB port, but have not yet integrated it into a control system.
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