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NEW MATERIALS FOR THE RAILWAY INFRASTRUCTURE

NEW MATERIALS FOR THE RAILWAY INFRASTRUCTURE. The problem of current collection. JSC RAILWAY RESEARCH INSTITUTE. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTURE The problem of head current collection. WIRES : contact wires ; suspension cable. CURREN COLLECTION INSERTS : MATERIAL:

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NEW MATERIALS FOR THE RAILWAY INFRASTRUCTURE

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  1. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTURE The problem of current collection JSC RAILWAY RESEARCH INSTITUTE

  2. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection • WIRES: • contact wires; • suspension cable CURREN COLLECTION INSERTS: MATERIAL: Carbon; Carbon-copper DESIGN: Simple; Compound SHAPE: Rectangular; Aerodynamic OVERHEADLINE SUSPENSION

  3. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection Tightening of operating conditions for high-speed traffic Current collection for high-speed railway transport is characterised by a simultaneous increase in: • TENSION STRESS OF OVERHEAD CATENARY WIRES INCREASES 2–3-FOLD;wave propagation speed ~ √N/m (N = tension force, m = weight per unit length); wave speed must exceed train speed • 2. SPEEDS INCREASE BY A FACTOR OF 2–2.5 • 3. CURRENT VALUE GROWS 1.5-2 TIMES • 4. ROLLING STOCK POWER IS PLANNED TO RISE TO 20 MW • 5. CURRENT AT THE CURRENT COLLECTOR: UP TO 4 kA FOR DIRECT CURRENT, OVER 1 kA FOR ALTERNATING CURRENT

  4. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection CURRENT COLLECTION FOR HIGH-SPEED RAIL TRANSPORT PROBLEMS: • A SHARP INCREASE IN WEAR AND DAMAGE RATES; 2.   INCREASED IMPORTANCE OF LOCAL WEAR (UP TO 1.5 KM OF CONTACT WIRE MUST BE REPLACED OWING TO INCREASED WEAR OF A FEW METRES); 3.LOW TEMPERATURE CREEP OF CONTACT WIRES AND SUSPENSION CABLES. • CAUSES OF THE UNSOLVED PROBLEM: • REGULATORY FRAMEWORK IS INSUFFICIENT OR NONEXISTENT; • NO SYSTEMATIC STUDIES AND TESTS OF MATERIALS USED IN THE COLLECTOR ASSEMBLY ARE AVAILABLE; • MATERIALS FOR HIGH-CURRENT SLIDING ELECTRICAL CONTACTS OF HIGH-SPEED RAIL TRANSPORT ARE NOT AVAILABLE

  5. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTURECONTACT WIRES

  6. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection Wires: possible solutions New technologies: Severe plastic deformation (SPD): Equal channel angular extrusion (ECAE); Conform process; Simultaneous drawing of two metals Improvement: mechanical and thermo-mechanical properties No decline in resistivity Alloying: Improvement: mechanical and thermo-mechanical properties Decline: Resistivity Alloying + SPD: Lower alloying level; Improvement: mechanical and thermo-mechanical properties No decline in resistivity

  7. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection WIRES: SPD Schemes ECAE in parallel channels ECAE Conform process Conform-process: continuous technology Improve the mechanical and thermo-mechanical properties

  8. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection Properties of wires: conform - process

  9. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection • Reconstructing areas of local wearwithout taking the wire down Reconstruction: deposited layer

  10. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTURE The problem of current collection Current collecting inserts

  11. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection • CURRENT COLLECTING INSERTS: • Materials development and possible solutions СНИЖЕНИUSING SELF-ASSEMBLY BEHAVIOUR OF SURFACE STRUCTURES, INCLUDING NANOSTRUCTURES, UNDER FRICTION: WEAR RATE IS REDUCED SEVERAL FOLD

  12. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collectionCURRENT COLLECTING INSERTS Aerodynamic shape of current collection inserts. Wear resistance increase (30-70 %) Catalyst application Wear resistance increase Without catalyst With catalyst 3% With catalyst 6% With catalyst 9% Current, A JSC “VNIIZhT”

  13. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection • CURRENT COLLECTING INSERTS: • Materials and shape. Aerodynamic modelling Heat flux distribution Temperature distribution Traditional shape Alternative shape

  14. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection • Research programme Studies to investigate wear rate dependence on current density, slidingspeed and contact force for various current collecting inserts and contact wires; 2. Studies of wear surfaces 3. Studies and tests of copper-based wires manufactured using different technologies to investigate low-temperature creep and determine their electrical, mechanical and thermal characteristics; 4. Developing a technology for reconstructing areas of local contact wire wear without taking the wires down; 5. Developing standards: – for contact wires; – for current collecting inserts; – for fixtures

  15. NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection • THANK YOU ! • Mobile phone: +79161476190 • Business e-mail : bushe@vniizht.ru • Home e-mail : isgershman@gmail.com

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