| 摘要 |
PROBLEM TO BE SOLVED: To enable highly accurate accident point orientation by reducing an orientation error caused by a bi-potential method.SOLUTION: An accident point orientation device includes: surge arrival clock-time detection parts 113, 114 for approximating, when a surge wave 104 detected at ends A, B of an underground cable 102 exceeds two different thresholds, an intersection between a zero level and a line passing through an intersection between the surge wave 104 and both of the thresholds to a clock-time when the surge wave 104 reaches the ends A, B. Further, an accident point position is oriented by: calculating an accident point position using a difference between surge wave arrival clock-times obtained by the surge arrival clock-time detection parts 113, 114 approximating and using a propagation speed of the surge wave 104 at the underground cable 102; and performing correction processing in accordance with a distance between the calculated accident point position and a given position. |
