HIFDA - High-Frequency Electrical Signals from Household Appliances Database

This work aims to provide a new database containing high-frequency steady-state electrical signals from individual common household appliances. A total of 12 appliances were captured with an acquisition rate of 100 kSPS, capturing only the times when the target appliance was active and consuming power (no idle states). Also, the empty grid (no active appliance) was captured in the same conditions.

For the creation of this database, 50 windows of the voltage and current signals were taken from each of the 12 isolated devices and the empty grid, each window containing approximately 54000 samples acquired at 100 kSPS, implying windows of 5.4 seconds. For convenience, these same windows were split again to create three additional data sets, containing windows of around 10, 100 and 1000 milliseconds. The windows are not exactly 10, 100 and 1000 milliseconds, as the number of data contained within each window has been adjusted to contain the power-of-two figure immediately higher of the exact figure that would correspond to match the target time. This means that, for example, to obtain windows of 10 milliseconds at 100 kSPS, 1000 samples are not stored per window, but 1024 samples instead, and so on. This makes the windows actually 10.24 ms, 163.84 ms and 1310.72 ms respectively. This decision was made to increase the performance of the processing device that uses this data for its intended purpose.

The database provided contains five main folders. One of this folders, "0.Img_Appliances", contains pictures of the 12 appliances whose electrical signals  were captured to create this database. The rest of the folders correspond to the different window divisions, as explained on the "Methods" section. Inside each of them there is a "Current" and a "Voltage" folder where, inside each, there is a folder for every appliance that was captured, containing the data in multiple files with text (.txt) format. It is important to keep in mind that, even though the file quantity is greater on the smaller window datasets, the information that all of the datasets contain is mostly the same, as it all comes from the full time records dataset. The bandwidth of the captured voltage signal ranges from 300 Hz to 100 kHz, so the fundamental component of the grid, located at 50 Hz, does not appear on the captured data. The captured current signal, on the other hand, has a bandwidth ranging from 30 Hz to 100 kHz approximately.

The appliances included are:
- Charger
- Computer
- Hair dryer
- Empty grid
- Griddle
- Heater
- Iron
- Coffee maker
- Laptop
- Light
- Microwave
- Monitor
- Vacuum