| 摘要 |
<p>PURPOSE:To easily locate an accident point by detecting the accident point from a time difference between the time when a surge current at the time of accident is detected, and an arrival time of a breakdown sound at the time of accident which is transmitted thereafter. CONSTITUTION:When an accident has occurred, surge currents 5A, 5B flow to the left and the right from an accident point X, and also, breakdown sounds 6A, 6B are propagated. In a joint part 2A, an arrival time point of the current 5A is detected through a current sensor 3A, an arrival time point of the breakdown sound 6A which arrives in the next time is detected through an acoustic wave sensor 4A, and from a time difference of both the time points, a distance xm to the accident point X is detected. In the same way, in a joint part 2B, a distance ym to an accident point (x) is detected by a current sensor 3B and an acoustic wave sensor 4B. According to this method, a time difference can be derived easily, and the accident point can be located easily.</p> |
