Hi! I was evaluating some of the ADE9000 specs and tried to implement a simple Overcurrent detection.
Setup was a three Phase 220Vrms/60Hz supply and 3 lamps as a load, consuming roughly 30mA on each phase.
Measurements for Current and voltage were perfect and sequence detection worked flawlessly but when I tried to use the Overcurrent indication I got confused with some of the timings between the event and the actual indication on pin IRQ1. This is what I got from a first attempt.
The cyan and magenta channels can be ignored, they are the voltage sinewaves for A and B phases. Green one though is a current measurement taken from a load passing through the CT on phase C. It starts off and when I press a switch it turns on on a scale that its suppoused to trigger the overcurrent interrupt.
Interrupt does trigger (obscured by the green cursor marker but its a falling edge on the yellow channel) but what got me confused was the 22,20mS time for it to be noticed by the ADE9000.
Datasheet says this indication takes into account the RMS½ measurements and also reference manual UG-1098 says these measurements are "[...] done over one line cycle, updated every half cycle."
Am I right to think that for a 60Hz signal this indication can only happen at about 25mS(16,67ms of one cycle + 8,33mS of a half cycle)?
I ask because I was hoping to detect this on half a cycle. If remember right another meter from AD (ADE7953) used peak measurements for this and it was able to detect these surges and overcurrents super fast. Not sure if ADE9000 has the same feature.
