Power quality detection, monitoring, reporting, recording and communication
in a revenue accuracy electrical power meter is disclosed. Transient
events are detected by monitoring the wave shape of the electrical power
and comparing deviations to a known threshold. Sags and Swells are
detected by computing root mean square value over a rolling window and
comparing the computed value with a known threshold. Harmonic frequencies
and symmetrical components are quantified by a known algorithm and
compared with a known threshold. Incoming waveforms are stored to memory.
All recorded and computed data is moved to non-volatile storage via direct
memory access transfer in the event that a power quality event jeopardizes
the operating power of the meter. Further, the meter provides a power
supply utilizing high and low capacitive storage banks to supply
sufficient energy to survive short duration power quality events which
jeopardize the meter's operating power.
