| 摘要 |
<p>PURPOSE:To make it possible to conduct error-free measurement of three phase, A.C. by inserting a resistance, which has the same value as output impedance of a current transformer, into secondary side of the currecnt transformer for measuring R-phase and T-phase currents. CONSTITUTION:An AC ammeter 5 is connected through a changeover switch 3 with secondary side of a current transformer 1 which supplies primary side with R-phase currect iR, and at the same time, a resistance 6 of the same value as output impedance of the current transformer is also connected through a switch 13. And, the ammeter 5 and the resistance 6 are connected through changeover switches 4 and 14 with secondary side of a currect transformer 2 which supplies primary side with T-phase currect iT. For measuring the R-phase current, it is performed by turning ON only the switches 3 and 13, and for measuring the T-phase and R-phase currents, the measurement is executed by turning ON only the switches 4 and 14 the switches 3 and 4, respectively. It is possivle, by so doing, to conduct error-free measurement of A.C. of three phases with a simple mechanism.</p> |
