| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electronic watt-hour meter for easily recognizing the degree of reverse current. <P>SOLUTION: This electronic watt-hour meter has a reverse current level monitoring section 6 for monitoring the magnitude of the total-phase watt-hour and controlling the display state of a total-phase reverse current state display section 21a according to the magnitude of the total-phase watt-hour when the direction of the total-phase electric power is reverse direction. The reverse current level monitoring section 6 includes a reverse direction watt-hour counter section 6a for performing count up proportionally to the total-phase watt-hour. The fact that the total-phase electric power is in the reverse direction is displayed by coming of the total-phase reverse current state display section 21a into a lighting state. Whenever the reverse direction watt-hour counter section 6a counts it by a predetermined value, the total-phase reverse current state display section 21a is temporarily extinguished to come into a blinking state, and the degree of the reverse current is displayed with the blinking speed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
