6005A T5 Aluminum Extruded Profiles Used As Rigid Catenary
(Overhead Contact System) On Metro Train
Aluminum alloy 6005A is a versatile alloy that can be used for
various applications. As a medium strength aluminum alloy,
6005A-T61 temper has mechanical property levels similar to 6061-T6,
6005-T5, and 6105-T5. 6005A should not be confused with 6005 due to
a difference in manganese and chromium content. 6005A provides good
corrosion resistance and finishing characteristics for anodizing or
paint.
6005A Chemical Composition Limits
Alloy
6005A | Si
0.5-0.9 | Fe
0.35 | Cu
0.3 | Mn
0.5 | Mg
0.4-0.7 | Cr
0.3 | Zn
0.2 | Ti
0.1 | Others Each
0.05 | Others Total
0.15 | Aluminum
Remainder |
The rigid catenary is an Overhead Contact System (OCS) that can
replace, with many advantages, the contact wire with sustentation
wire, the third rail or the suspended bimetallic T-rail.
It is formed by an aluminium alloy profile, which accommodates the
copper contact wire, with a great cross section for the current
that allows operative OCS voltages from 750 to 1.500 V, without any
feeding supply. It has been also installed in lines with a feeding
supply of 25 KV.
Rigid catenary system is a new power supply mode of electrification
railway, comparing with the traditional flexible catenary system,
it has below advantages.
1- more capability of current carrying
With large cross section current bar profile clamping contact wire,
current bar profile and contact wire clamped in the draw-back
collet current bar profile can permit high level current passing.
Further more it can effectively reduce the radiation problem which
caused by high level current.
2- No risk of breaking-off, more security
As there is no traction stress, it allows more contact wire wear
without risk of breaking-off in rigid catenary system, the only
limitation is that the pantograph can not touch the current bar
profile.
3- Easy operation and maintenance
As the contact wire allows more wear and its installation and
replacing is easy in rigid catenary system, the maintenance cost is
greatly reduced. Periodical control of the current bar profile
connectors tightening and cleaning up of the isolators are the only
maintenance operations to be carried out
4- less tunnel clearance, less construction cost
Rigid catenary system reduces great tunnel clearance against
standard catenary system, so the construction cost is greatly
reduced.
