Dojikukeeburukidenkaironokoshotenhyoteihoho

摘要

PURPOSE:To make an accurate orientation attainable, by measuring an electric current of a coaxial cable and a voltage between both inner and outer conductors at the power source side, while metering the current of a connecting line between each rail at both ends of the cable and the cable outer conductor and thereby orienting a fault point. CONSTITUTION:In the case where a coaxial cable itself goes something wrong with a short, if both inner and outer conductors are short-circuited at a spot Sc distant away as far as lc from P1, a fault current Is flows out of a substation, while voltage Vc at the P1 point drops to some extent as compared with its normal time. And, impedance Z of up to the fault point inside the coaxial cable is proportioned to the distance lc so that impedance Zc of the coaxial cable in time of its normal state is set down as an already-known datum, so the lc is findable but the fault point is shorted by an arc, eliminating the error, whereby reactance X for a takeout portion from the impedance is calculated by a circuit M. Next, if a trolley line and a rail are short-circuited at a track, power is fed to a fault point SF from P2 as well just like from the P1 whereby a distance lF up to the fault point is calculated by a current I2 out of a current I1 and the P2 at a circuit N.