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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

The problem of current collection

JSC RAILWAY RESEARCH INSTITUTE

new materials for the railway infrastructure the problem of head current collection
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

new materials for the railway infrastructure the problem of head current collection1
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
new materials for the railway infrastructure the problem of head current collection2
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
new materials for the railway infrastructure the problem of head current collection3
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

new materials for the railway infrastructure the problem of head current collection4
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

new materials for the railway infrastructure the problem of head current collection5
NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection

Properties of wires: conform - process

new materials for the railway infrastructure the problem of head current collection6
NEW MATERIALS FOR THE RAILWAY INFRASTRUCTUREThe problem of head current collection
  • Reconstructing areas of local wearwithout taking the wire down

Reconstruction: deposited layer

new materials for the railway infrastructure
NEW MATERIALS FOR THE RAILWAY INFRASTRUCTURE

The problem of current collection

Current collecting inserts

new materials for the railway infrastructure the problem of head current collection7
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

slide12
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”

new materials for the railway infrastructure the problem of head current collection8
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

new materials for the railway infrastructure the problem of head current collection9
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

new materials for the railway infrastructure the problem of head current collection10
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