Performance requestsIn electric railways in Japan, inspection cars are running at commercial speed, in order to measure wear of contact wires. We have developed an apparatus to measure the contact wire wear with a light source of sodium vapor lamps of simpler mechanism and smaller size than that of current apparatus. This appa-
ratus measures the width of wear surface by an optical method, and converts it into a residual height, This apparatus has been used for JR Yamagata Shinkansen in JR. On the other hand, we miniaturized this apparatus further, and developed an overhead contact line inspection system for rail-and-road cars. The results of field tests show that it can be used at a standard deviation of measuring error of 0.3 mm in daytime.The apparatus should have the following performance.(1) It can be used in daytime.(2) The measurement frequency is 500Hz or over to make (3) The measurement range for horizontal deviation is (4) It Can meaSUre maximum four Wires at the Same time. 2.2. The method of measurement the measuring pitch 70" in 130kmh running. 700".In Japan, the cross section of the contact wire has a circular shape with two grooves. Fig. 1 shows the cross section of the contact wire. The wear surface of contact wire becomes flat due to the sliding of pantograph and the size in the direction of height decreases. To measure the
This paper proposes an arc contact loss rate estimating method for Shinkansen trains with pantographs connected to bus cables. For the speedup of Shinkansen, it is necessary to judge whether the contact loss rate exceeds its standard value. As the standard of contact loss rate is provided from the viewpoint of contact strip wear caused by arcs, it is important to measure the amount of arc. The optical type contact loss measuring method which detects the contact loss by arcs is suitable for this purpose. It is difficult, however, to measure contact loss by this method in the daytime, because of the influence of outdoor light. To solve the above problem, we have developed an arc contact loss rate estimating method by using a contact loss simulation program on the basis of the complete contact loss rate measured by the current type contact loss measuring method which is effective in the daytime. Furthermore, we measured the contact loss rate simultaneously by the current and optical type contact loss measuring methods in the running tests of Shinkansen trains, and confirmed the validity of this estimation through a comparison of measured and simulated results.
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