Collection Setup

Tracebase comprises a collection of electrical appliance power traces, which can be used for research in various application areas. For the collection of the traces, we have used the Plugwise system, which enable to capture the real power demand of an attached consumer at a resolution of several samples per second. A polling application has been created, which continuously requests the wattage measured by each of the deployed Plugwise devices.

The collected readings are stored on the data collection node in comma-separated value files; one file is created for each metered wall outlet. Each entry in the file is preceded by the date and time of its collection, followed by the power consumption readings averaged over time durations of one and eight seconds, respectively. An excerpt of a trace looks as follows:

14/01/2012 10:48:47; 151; 156
14/01/2012 10:48:48; 147; 151
14/01/2012 10:48:49; 147; 151
14/01/2012 10:48:50; 145; 149
14/01/2012 10:48:51; 145; 147
14/01/2012 10:48:52; 145; 147
14/01/2012 10:48:53; 143; 147
14/01/2012 10:48:54; 143; 145
14/01/2012 10:48:55; 143; 143

A plot of selected power consumption traces from a computer monitor, a video projector, and a refrigerator are shown below.

Energy trace of a computer monitor.

Energy trace of a video projector.

Energy trace of a refrigerator.