Dedicated experimental equipment is presented developed for a study of the tribological behavior of current collectors sliding against overhead contact wires under various conditions. A unique wear tester that replicate the operating conditions of actual pantographs in railway power collection systems was developed. The sliding element moves over the wire in a controlled horizontal motion at homogeneous velocity, and a constant normal load can be applied on the contacting materials during this motion. Dynamic friction coefficient data, as well as the dynamic contact resistance between the contact couples were monitored using a signal collection device equipped with DAQ (data acquisition) software. The wear couples were examined in sliding using the same normal load, in dry and lubricated conditions. The friction coefficient decreases during the test in all cases, but electrical resistance and contact resistance increase. For Cu vs Cu in dry contact, the dynamic friction coefficient measured after run-in was 0.34 and the electrical contact resistance increased by approximately 5 % after 106 wear cycles. Application of graphite grease - a commonly used lubricant - increased the contact resistance by about 300 %. The dynamic friction coefficients of Cu vs Cu lubricated with common grease was constant - about 0.24, and the electrical contact resistance was 1.97 microOhm. For CCM (carbon-copper composite materials) in dry sliding against Cu, the dynamic friction coefficient increased by 20 % (from 0.27 to 0.22) after 40000 cycles, while the dynamic electrical resistance increased slightly from 5.32 to 5.35.


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    Title :

    A sliding wear tester for overhead wires and current collectors in light rail systems


    Contributors:
    Da Hai He (author) / Manory, R. (author) / Sinkis, H. (author)


    Publication date :

    2000


    Size :

    11 Seiten, 10 Bilder, 25 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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