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06:42 Jun-14-1999
Dinesh Bansal
25 kV overhead hard drawn Copper Contact wire

We are facing the problem of unexplained breakage of contact wire
of 107 square millimeter ( one fourth of a square inch ) which is kept
under 1000 Kg ( 2240 pounds ) tension.
It carries current to electric locomotives through a Pantograph
which maintains 7 Kg pressure.
Any suggestions for preventive diagonostics and testing of contact
wire before stringing ?
Dinesh Bansal, Chennai ( Madras ) , India



 
08:17 Jun-14-1999

Godfrey Hands

Engineering,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
284
Re: 25 kV overhead hard drawn Copper Contact wire : We are facing the problem of unexplained breakage of contact wire
: of 107 square millimeter ( one fourth of a square inch ) which is kept
: under 1000 Kg ( 2240 pounds ) tension.
: It carries current to electric locomotives through a Pantograph
: which maintains 7 Kg pressure.
: Any suggestions for preventive diagonostics and testing of contact
: wire before stringing ?
: Dinesh Bansal, Chennai ( Madras ) , India
:

Hallo Mr. Bansal.
I suggest that the copper wire is eddy current tested before installing. Use this to detect cracks and splits in the wire, and also to detect local inhomogenieties in the wire.
Is the supplier in India or elsewhere in the world. You may be able to specify tested wire in yiour purchase.
The problem may also be caused by local arc burning of the wire from disconnections and recommections of the locomotives whilst in service.

Regards
Godfrey Hands



 
04:07 Aug-14-2000
Siamak Shokri (Msc in metallurgical Engineering)
Re: 25 kV overhead hard drawn Copper Contact wire We are looking for production of grooved contact wire in Railways research center of Iran.We need some information about production of it.we will be glad if you send us this information or introduce us to suppliers of this type of wires.
our address is:
Iran Railways research center,production group
no.201 Italia crossing,Vessal avenue
Tehran,Iran
Fax no. 009821-651462
Yours Faithful



 


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