eb - Elektrische Bahnen Bahnenergieversorgungssystem der DB erneut bestätigt (Vorschau)

Pantographs
of materials in presence for a given speed, force and
current, this in the absence of visible electrical arcs.
On Polimi test rig, usual runs to qualify wear were
600 km, equivalent to 43 400 contact strip passages.
Here it was increased up to 1 800 and even 2 400 km,
respectively 130 000 or 170 000 contact strip passages.
On the Hoffmann bench, usual runs were approximately
500 km to qualify a material, equivalent to
100 000 passages of strips and were increased to
4 000 km equivalent to 750 000 contact strip passages.
It can be noticed that the wear rates compared
between the two test rigs showed a great similarity
of behaviour for the contact strips (Figure 10) and
for the contact wire (Figure 11).
Differences mainly follow from different test rig
designs.
TABLE 1
Testprogram
Carbon
material
Designation
Metal
con tent
in
weight
%
Speed
km/h
Force
N/mm
Current
A/mm
B B plain 0 183 1,7 8
C
C imp
35 %
35 183 1,7 8
A A plain 0 183 1,7 8
A
A
A imp
25 %
A imp
25 %
25,1 183 1,7 8
25,1 200 1,7 8
arcing duration →
2,0
%
1,6
1,2
0,8
0,4
0,0
60 110
Contact force →
N
km/h
200
180
velocity
Rockwell hardness →
120
HR5
150
110
100
90
80
B imp 26%
A imp 20%
A imp 25%
C imp 35%
D imp 48%
F plain
B plain
E plain
A plain
0 5 10 15 20 25 30 35 μΩm 40
resistivity →
Figure 12:
Percentage of contact loss as a function of static contact force and
sliding speed.
Figure 13:
Hardness of contact strips and resistivity of materials.
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111 (2013) Heft 3
191