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    • 6. 发明专利
    • MEASURING METHOD FOR LINE-TO-LINE IMPEDANCE
    • JPS5850474A
    • 1983-03-24
    • JP14871281
    • 1981-09-22
    • OSAKI ELECTRIC CO LTD
    • FUKUSHIMA MITSUAKIFUJINUMA HIDEFUMIKOMAZAWA SATOSHI
    • G01R27/16
    • PURPOSE:To measure a line impedance in an arbitrary phase by computing the line-to-line impedance from the maximum values of voltage and current and the phase difference of an injected wave to be measured in a prescribed phase of a power-line AC voltage. CONSTITUTION:The phase of a power-line AC voltage in a low-voltage distribution line 1 is detected by a power-line AC wave phase detecting circuit 7. When it becomes a phase to be measured, a wave to be measured of known frequency is injected into the line of the low-voltage distribution line 1 via an injection circuit 3. The graph shows the waveform of the voltage (curve v) of the injected wave to be measured and the waveform of the current (curve i) thereof, wherein T denotes the interval of one cycle of the injected wave to be measured, ta a time of the phase difference between the waveform of the voltage v and that of the current i, Vp the maximum value of the waveform of the voltage, and Ip the maximum value of the waveform of the current, respectively. Accordingly, the absolute value¦Z¦of a line-to-line impedance on the occasion can be calculated by¦Vp/Ip¦and the phase difference theta by ta/TX 2pi, respectively.