Patent ID: 6058354
Filing Date: 2000-05-02
Classification: G01R

Abstract:
An electricity meter for measuring and processing electrical physical magnitudes of voltage and current input signals, comprising:a quantity of analog/digital converters, each configured to receive a respective one of said voltage or current input signals, which transform scanned analog value samples of each of said voltage and current input signals into corresponding temporarily appearing digital values,a 90.degree. phase advance/delay digital filter,a first processor which receives said temporarily appearing digital values and further processes each of said temporarily appearing digital values to derive a respective auxiliary magnitude value from each temporarily appearing digital value, wherein the auxiliary magnitude values include at least accumulated values ##EQU4## where n=1 to N, where V.sub.j,n and I.sub.j,n are said temporarily appearing digital values of the scanned analog values of said voltage and current input signals, said digital values V.sub.j,n and I.sub.j,n being inputted to said 90.degree. phase advance/delay digital filter, where V*.sub.j,n and I*.sub.j,n are digital values at the output of said 90.degree. phase advance/delay digital filter, where j=1 to the number of respective network phase voltages or currents, and where N is an integral number which designates a number of scanned analog values which are measured per a selected accumulation time,a second processor which receives said auxiliary magnitude values from said first processor, and utilizes said auxiliary magnitude values to measure said electrical physical magnitudes.