So yeah, obviously if the events are caused by a device within my house (like an AC compressor hard starting) I would like to be able to correlate that with when the AC unit fires up so I can investigate. Or if they are due to a bad joint or something in my main panel.
Most of the time however these events happen out on the power grid. I want to be able to analyze those events in order to see how severe they were and to be able to provide feedback to the power company about them if they are severe enough to warrant. This kind of data would be fantastic to help isolate issues like failing tap changers, voltage regulators, capacitors, etc…
I was frankly expecting this feature to use the same data sources and UI elements that the main usage graph uses. That way we can zoom in and look at arbitrary time periods and can watch the graph in real time during things like storm events. (incidentally, you really should build the sense to be able to operate on very low voltages so that it stays online even down to say 40 volts like what happened to a friend of mine this weekend when his phase blew but backfeed power from other customers with three phase power still was giving him minimal voltage).
As far as resolution of the data:
Power quality event reporting is actually an area I know little about, however, I do know that professional quality monitors can capture an “event” down to very detailed levels of precision (I think used to analyze what happens when protection circuitry operates to isolate a fault, etc…). I realize that storing this level of data all the time would be incredibly intensive and infeasible.
I see the use cases here as threefold:
- Informational / as a hobby - folks are interested in seeing what is going on but without any solid actions to come from that
- Information to help track down failing equipment or power quality issues within the house
- Information to help the power company track down issues or to hold them to task when they are not performing. Really, the ability to correlate events on a graph to specific times of day can provide clues as to what the issue is (also, I am sure this data will get used to prove that a utility caused damage to a customers equipment at some point).