| 摘要 |
PURPOSE:To execute locating with high accuracy by estimating an arc voltage of a fault point from a result of frequency analysis of a voltage at an electrical plant outlet. CONSTITUTION:A high-frequency component voltage in a measured voltage of an electrical plant outlet at the time of generating an arc fault obtained by a frequency analysis is a high-frequency component contained in a fault point arc voltage attenuated by high-frequency attenuation characteristics of a line, and also, a ratio of the high-frequency component voltage in the fault point arc voltage to a fundamental wave component voltage is roughly constant. Therefore, by utilizing this point, an arc voltage of a fault point is estimated from a prescribed expression, and by subtracting this voltage from the fundamental wave voltage component of the measured voltage at the electrical plant outlet, a voltage drop of a line extending from the electrical plant to the fault point is derived. From the obtained voltage drop, a measured fault phase current at the electrical plant outlet, and a line impedance per unit length, a distance extending from the electrical plant outlet to the fault point can be derived.
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