Презентация на тему: NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear

NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear
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Первый слайд презентации: NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear

Researcher: graduate student, Faculty of mechatronics and automation, electrotechical units department, Roman Vagaytsev. Research adviser : Cand.Eng.Sc.Associate Prof. , electrotechical units department, Birykov V.V. Novosibirsk 201 6

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1. Reducing wear of contact wire at stations for extending the life time of contact wire and for reducing the contact loss of pantographs of passing high speed trains; 2. Conduct the experiments. 2 Objectives:

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(a) Side view (b) Front view Figure 1. Composition of wear experiment facility 3 Wear experiment facility and conditions of the experiments

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(a) Disk and pantograph (b) Disk Figure 2. External appearance of wear experiment facility 4 Items Specifications Max. sliding velocity 250km/h ( 7±0.4 km/h in these experiments ) Max. current DC500A ( 0 or 100A in these experiments ) AC350A Voltage between disk and pantograph DC200V ( in these experiments ) AC148V Lateral motion of pantograph ( left and right ) 200mm each ( cycle is variable, 52.4 sec. / cycle in these experiments) Table 1. Features of wear experiment facility

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Properties Items Contact wire Cu Cu-Sn Cu-Cr-Zr ( "PHC" ) Nominal cross-sectional area ( mm ) 110 110 110 Tensile strength ( MPa ) 344 364 477 Conductivity ( %IACS* ) 98 70 80 *:International Annealed Copper Standard Specific weight ( g / cm 3 ) 8.9 8.9 8.9 Hardness Hv ( MPa ) 120 130 180 Items Contact strip Size ( length * width * depth (mm) ) 270 * 40 * 10 Tensile strength ( MPa ) 254 Conductivity ( % ) 4.1 Specific weight 7.1 Hardness HB ( MPa ) 126 5 Items Conditions Sliding velocity 7±0.4 km/h Normal load ( force pressing strip ) 47.04 N Voltage between disk and pantograph DC200V Sliding time 370min Lateral motion of pantograph ( left and right ) 200mm each 52.4 second / cycle Current condition (1) (2) (3) No current DC100A DC100A with boundary lubrication Table 2. Properties of contact wire and contact strip Table 3. Experiment conditions

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6 Results of the experiments (a) Cu (b) Cu-Sn (c) Cu-Cr-Zr Figure 3. Changes of friction coefficient with time

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7 Results of the experiments

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8 Results of the experiments

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Последний слайд презентации: NOVOSIBIRSK STATE TECHNICAL UNIVERSITY Contact Wire Reducing Wear

In the cases of boundary lubrication, it seems that there is a possibility that the powder cut from contact wire is mixed into the grease. It can be considered that this would contribute to electric conduction and make contact resistance smaller. It seems effective to mix conductive substances into the grease for boundary lubrication. However, the influence on contact wire and contact strip by the pantographs which pass at high speed needs to be checked. If the wear of contact wires of stations at the points where pantographs stop can be decreased, speed of passing trains especially at stations without through tracks can be raised. This promotes convenience for customers. 9 Conclusion

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