| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electronic watt-hour meter capable of showing that there is no erroneous connection even if reverse current display is lighted when a power factor of each phase power is extremely low. <P>SOLUTION: The watt-hour meter has a constitution including an each phase power operation part for operating each phase power from a voltage value and a current value in an electric path, an each phase power direction discrimination part for discriminating the direction of each phase power, a power factor state monitoring part for monitoring a value of the power factor of each phase power, an each phase reverse current display control part for controlling reverse current display based on results of the each phase power direction discrimination part and the power factor state monitoring part, and an each phase reverse current state display part for displaying the reverse current. <P>COPYRIGHT: (C)2011,JPO&INPIT |
