Patent ID: 9194897
Filing Date: 2015-11-24
Classification: G01R

Abstract:
1. An electronic watt-hour meter, comprising: a first multiplexer receiving a plurality of detected currents detected in respective polyphase power lines in parallel, to output the received detection currents in series; a first signal converter converting a signal output from the first multiplexer into a digital signal; a first demultiplexer outputting a serial input from the first signal converter in parallel; a line voltage generator generating a plurality of line voltages from the plurality of detected voltages detected in the respective polyphase power lines, the plurality of line voltages including a reduced phase interference signal component and a reduced random noise signal component; a second multiplexer receiving the plurality of line voltages in parallel, to output the received line voltages in series; a second signal converter converting a signal output from the second multiplexer into a digital signal; a second demultiplexer outputting a serial input from the second signal converter in parallel; and a calculating unit calculating a power value from a signal output from the first demultiplexer and a signal output from the second demultiplexer.