| 摘要 |
PROBLEM TO BE SOLVED: To obtain information on electric power or current flowing through a line by measuring a voltage without entailing construction work in any case, while dispensing with direct measurement on the current. SOLUTION: This method is used for obtaining information on electric power or current flowing through the line. With respect to indoor wiring, out of arbitrary two points, an upstream-side point and a downstream-side point, with a current flowing therethrough, a load of known power consumption is connected to the downstream-side point to estimate a resistance value r between the two points from voltage values measured at the two points. The voltage values V<SB>1</SB>and V<SB>2</SB>at the two points are measured to estimate the magnitude of active power P or a current value of a current flowing therethrough by using only a voltage difference between the two points on the basis of the estimated resistance value r without directly measuring the current. COPYRIGHT: (C)2007,JPO&INPIT
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