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Instantaneous active power measuring device

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专利汇可以提供Instantaneous active power measuring device专利检索,专利查询,专利分析的服务。并且PURPOSE: To secure the detection of information absence and wrong information and the estimation of a fault device, and improve the reliability of a total system by monitoring the balance characteristics of three-phase balanced power all the time.
CONSTITUTION: Ditital conversion amounts Wa, Wb, and Wc of respective phases are inputted to an adding circuit 6 to obtain a sum W
3ϕ , which is compared by a CPU8 with a digital conversion amount W
3ϕd as the sum of analog values, so that an input circuit 5 detects circuit malfunction, trouble, etc. Further, the operation data of the adding circuit 6 which handles the outputs Wa, Wb, and Wc of single-phase watt converters 1a, 1b, and 1c, and results of sample holding circuits 2a, 2b, 2c, and 2d are stored in a memory 9 through an A/D converter 4 previously, and compared with the reference input value of a reference generating circuit 7 to make the judgement of the fault preceding and succeeding a multiplexer 3 as a boundary.
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