| 摘要 |
PURPOSE:To reduce a cost by detecting the input current of an air conditioner by a through type current transformer mounted to a power line and integrating a detected current value by time to determine the power consumption of the air conditioner. CONSTITUTION:A signal outputted from a through type current transformer 3 mounted to the power line 1 of the outdoor unit 2 of each air conditioner is inputted to a power integrating circuit 4 and, after converted 4a to a voltage value in the circuit 4, A/D-converted 4b and inputted to an arithmetic unit 4c. Electric energy outputted from the arithmetic unit 4c is transmitted to a centralized control unit 5 via an interface unit 4e. The output of a pulse output watt-hour meter 6 is inputted to the unit 5 and the power consumption of all the air conditioners is recorded in the unit 5. Thus, a cost can be reduced by constituting a power integrating instrument by the through type current transformer. |
