| Autor: |
Konieczny, J., Labisz, K., Wieczorek, J., Adamiak, M., Ćwiek, J. |
| Předmět: |
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| Zdroj: |
Archives of Materials Science & Engineering; Aug2024, Vol. 128 Issue 2, p49-57, 9p |
| Abstrakt: |
Purpose: The paper presents the results of the stereometry specification of the damaged guide of a section insulator of railway electric traction made of hard electrolytic copper Cu-ETP. The tested guides were withdrawn from service due to damage. Design/methodology/approach: The tests were carried out on guides that were operated for 6 or 12 months on lines where trains moved at a maximum speed of 40 or 120 km/h.The analysis of the geometry of the surface was based on data acquired by measuring selected fragments of guides and executing them on a laser profile measurement gauge MicroProf of the FRT company. The microstructure analysis was performed on the ZEISS SUPRA 25 Scanning Electron Microscope (SEM) using the EDS. Findings: Analysis of the test results showed that the electric arc is the most destructive phenomenon that accompanies the operation of the guides of section insulators made of Cu-ETP copper. The stereometric tests have characterised the guide surfaces using specific values, e.g., copper drop height or abrasion depth. Research limitations/implications: Since the tests were carried out on guides operated on the railway electrical traction, in real conditions, it is very difficult to acquire data on operating parameters such as voltage and electric current, the pressure force of the pantograph on the electric traction, the temperature to which the guide heats up as a result of an electric discharge or under the influence of flowing air, high current, etc. Practical implications: The most important mechanisms destroying the guide made of Cu-ETP copper have been characterised, and thanks to this, in the next stage of research, it will be possible to counteract the effects of damage effectively. Originality/value: The presented test results concern guides operated in real conditions and show the effects of the electric arc and the accompanying physical phenomena. The test results are not the result of laboratory simulations intended to reflect real operating conditions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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