Apparatus and method for monitoring power

Abstract From the Canadian patent

A power monitor for determining real and imaginary power associated with one or more line signals samples a plurality of line cycles during an observation window to generate a plurality of voltage-current sample sets for each line cycle. The sampling of the sample sets is timed such that the voltage-current sample sets are taken at different relative time positions. The power monitor stores incoming voltage-current sample data in one memory area and concurrently analyzes sample data already stored in another memory area. Deletion of sample data is not permitted until transient analysis of such data is complete. In another embodiment, the power monitor includes a working data memory area …