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

Pantographs
The program shown in Table 1 was applied for
various materials, plain or impregnated up to 35 %
in weight of copper or copper alloy.
At that last step of the project, the test duration increased
to 4 000 km or 290 000 strip passages, in order
to guarantee the stability of the measured wear rates.
Looking at a map of hardness and resistivity of the
strip materials, the domains of plain and impregnated
carbons are clearly distinct. Thus, it was expected
that wear processes may strongly depend on
these parameters (Figure 13).
However, assessment of all experiments done at
Polimi and Hoffmann test rigs show the clear result
that the wear of all tested materials plain carbon and
metalized carbon up to a copper content of 35 % in
weight is of the same order of magnitude for equal
test conditions. Moreover, plain and metalized carbon
show a similar distribution of wear rates.
Some efforts were undertaken to identify those
material parameters that have a major influence on
wear rates. Typical contact strip parameters like resistivity,
surface hardness, flexural strength, material
density and finally copper content showed within the
range of parameters of the tested materials no significant
impact on wear rates of contact wires and strips.
Within the framework of this study no clear parameter
could be identified except the correlation with
the number and intensity of arcs (Figures 14 to 16).
4 Final results
wear rate of wire related to
contact strip passages
3
mm²
→106
2
1
0
180 km/h 200km/h
B plain C imp 35% A plain A imp 25% A imp 25%
Carbon material
Figure 17:
Wear of wires for different strip materials at different rates of arcing.
blue
sections
red
sections
(u