| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wattmeter which can rationally check a plurality pieces of electricity information, including purchase of electrical energy and selling electrical energy at each electric power supply destination by the electric power meter alone. <P>SOLUTION: The wattmeter 50 checks purchase of electrical energy supplied from an electric power system and selling the electrical energy generated by an electric generator to be sold separately. In the checking of electrical energy by the wattmeter 50, the flow of the electric power system is detected; and while the buying electrical energy and the selling electrical energy are discriminated from each other, on the basis of the direction of the detected flow, the purchase of electrical energy and the selling electrical energy are checked separately. <P>COPYRIGHT: (C)2011,JPO&INPIT |
