The measurement of trolley wire wear continuously and automatically from a car running at a maximum speed of 210 km/hr is discussed. A television system has been studied and tested since 1966 to measure the width of the worn surface of trolley wire which had a 750 mm vertical deviation and 350 mm horizontal deviation. An improved instrument, employing a newly developed three-inch diameter electromagnetic type image dissector tube, has proved to be capable of measuring the width of four trolley wires separately and simultaneously with static accuracy of 0.1 mm and dynamic accuracy of 0.2 mm. Japan National Railways have installed three instruments on measuring cars for routine use and another four instruments will be used in the near future. This paper describes the design of the system, the measuring error caused by the combination of the catenary structure of the wire and the slit aperture of the image dissector tube, the design of the image dissector tube and the signal processing. Finally, actual data measured by the system are shown as the results which represent wavy wear, irregular wear near the hanging points and correlation between wear and lateral deviation. These cannot be obtained by the conventional point-by-point method using a micrometer.

  • Corporate Authors:

    Institute of Television Engineers of Japan

    3-5-8 Shiba Koen, Minato-ku
    Tokyo 105,   Japan 
  • Authors:
    • Horiki, K
    • Ichikawa, M
    • Yasumatsu, E
    • Tsuchiya, Y
    • Niwa, N
  • Publication Date: 1976-9


  • Japanese

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00152610
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: May 31 1977 12:00AM