Table 2 Data record glossary for MFRED.

From: MFRED, 10 second interval real and reactive power for groups of 390 US apartments of varying size and vintage

Column header Explanation, unit, accuracy (where applicable)
DateTimeUTC Time stamp of each data entry, at UTC (coordinated universal time, also known as Greenwich Mean Time), i.e. not adjusted for daylight saving; csv files show time in format: yyyy:mm:dd HH:mm:ss (24 h format)
kW* Instantaneous real power [kW] per apartment, observed at DateTimeUTC; accuracy is ± 1%, however the minimum detection threshold is 0.003 kW
kVAR* Instantaneous reactive power [kW] per apartment, observed at DateTimeUTC; accuracy is ±1%; inductive loads draw positive, whereas capacitive loads draw negative reactive power
kWh* Cumulative electricity consumed [kWh] per apartment, between 01-Jan-2019 5:00:00 UTC (i.e., first time stamp in MFRED) and DateTimeUTC
kVA Instantaneous apparent power is not included in MFRED but can be calculated via the power triangle40 as follows: kVA = sqrt(kW² + kVAR²)
Phase angle Instantaneous phase angle (PA) is not included in MFRED but can be calculated via the power triangle40 as follows: tan(PA) = kVAR/KW
  1. *For each of the 26 apartment groups (AG), electricity metrics are averaged across the 15 apartments in each group. The group that each column refers to is indicated by the prefix “AG01”, “AG02”, …, “AG26” in the column headers. For ease of use, a grand average across all 390 apartments is also provided (indicated by the prefix “AGs01To26” in the column headers). Each metric therefore represents the kW, kVAR, or kWh of an average apartment (not the sum across apartments). The total real [reactive] power on the grid can be calculated by multiplying the given average kW [kVAR] value with the respective number of apartments.