| 摘要 |
PROBLEM TO BE SOLVED: To provide a power measurement system capable of automatically setting a communication address peculiar to respective CT control units without any errors and connecting a required number of CT control units in execution when the plurality of CT control units are daisy-chained in the power measurement system.SOLUTION: A main control unit of a power measurement system and a plurality of CT control units are daisy-chained as a master-side device and slave-side devices, respectively for serial communication. As a method of setting a communication address, address terminals and resistors connected to the address terminals are provided in the respective CT control units, and the respective terminals and resistors are serially connected between a power supply and the ground. By separately converting voltages at pre-stages of the resistors connected to the address terminals for the respective CT control units and voltages at post-stages of the resistors from analog to digital, communication address setting can be performed automatically, and the number of the CT control units can be increased or decreased during operation. A system can be applied regardless of the scale of facilities in an installation construction field. |
