| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To detect a fault at a current value close to an original power supply system without being affected by SVC. <P>SOLUTION: The alternating currentΔI type fault section device includes: an input conversion means 31 for converting current flowing on the power supply system of a down electric train line and an up electric train line, and current flowing on a switching section to an optional current value, respectively; a sampling hold means 32 for sampling-storing converted individual analog current values at a predetermined cycle; an A/D conversion means 33 for converting the sampled individual analog current values to a digital current value, respectively; a harmonic wave detection means 34 for extracting a harmonic wave component from a digital current value corresponding to the current flowing on the switching section; and a harmonic wave component synthetic processing means 35 for calculating a load equivalent current by multiplying the extracted harmonic wave component by a synthesis ratio determined according to a system state, to synthesize into a digital current value corresponding to the current flowing on the power supply system. The alternating currentΔI type fault section device executes operation when the amount of current variationΔI calculated from the obtained load equivalent current exceeds a predetermined value. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
