Hard spot method of detection and hard spot detection device null of trolley

摘要

PURPOSE:To prevent the high voltage of a trolley wire from being introduced into train voltage and make it unnecessary to use an insulation separating device and eliminate noise etc., caused by spark by mounting pressure sensors operated by an accelerometer on respective support insulators both of which support a panthagraph, and detecting the impact of the panthagraph colliding against the hard spot of the trolley wire. CONSTITUTION:Of four support insulators all of which support a panthagraph 2, front and rear insulators 3a, 3b both located on the right or left side of the direction in which a train travels have respective pressure sensors 5a, 5b mounted thereon, the pressure sensors 5a, 5b each being operated by an accelerometer. A voltage detected at each pressure sensor 5a, 5b has its low-frequency component removed by a high frequency filter 6a, 6b so that high-frequency components are output as against impact forces applied at the hard spot of a trolly wire. Since oscillatory components caused by the impact forces are in opposite phase, the oscillatory components are added to the (+) and (-) terminals of an arithmetic amplifier 7 and synthesized so as to obtain data on the hard spot with twice the initial sensitivity. The output of the arithmetic amplifier 7 is digitized by an A/D converter 8 and transferred to a data processing portion 9. Data on the running position of the train detected by a running position detector 10 is input to the data processing portion 9 and recorded in a recorder 11 in parallel with data on the hard spot.