| 摘要 |
PURPOSE:To improve reliability on protection of a trouble, by a method wherein the number of passing times of an electric rolling stock through the feed points of first and second substations is counted, and when the two counted numbers of passing times are coincided with each other, a trouble in a railway line is decided according to the polarity state of a current flowing to a plurality of railway lines. CONSTITUTION:First and second current detecting means 11 and 12 are provided for detecting the intensity and the polarity of a current flowing to each d.c. electric pass in order to interconnect the forward power converters of first and second substations, situated adjacent to each other, and a plurality of railway lines. First and second train pass detecting means 13 and 14 are provided for detecting pass of an electric rolling stock through the feed point of each substation, the number of pass times of an electric rolling stock is counted by means of first and second counting means 15 and 16. When counting output from the two counting means 15 and 16 are coincided with each other, it is decided by a first deciding means 17 that no electric rolling stock in a railway line is present. When, during the decision, current polarity detected by the two current detecting means 11 and 12 is a given polarity, it is decided by a second deciding part 18 that an electric line is abnormal.
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