1.3 Swell and Sag

The metrology firmware supports respective swell/sag thresholds for all voltage channels x (where x = [A, B, C]):

There are respective flags SWELL_DET_Vx/SAG_DET_Vx to indicate the swell/sag status for every voltage channels. These flags are updated every half cycle.

Example:

If V_SWELL-RMS = 220 * 1.2 = 264V and K_Vx = 1651, then this is possible:

SWELL_THRESHOLD_Vx = ((220 * 1.2 / 1651)²) * 2³² = 0x068BB09A

If V_SAG-RMS = 220 * 0.8 = 176V and K_Vx = 1651, then this is possible:

SAG_THRESHOLD_Vx = ((220 * 0.8 / 1651)²) *2³² = 0x02E8C044