Mohammad Jazini - Ministry of Energy,Tehran Regional Electric Co.(T.R.E.C)Tehran, Iran
S. M. Mousavi G. - Centre of Excellence for Railway, Iran University of Scienceand TechnologyTehran, Iran
Mahdi Jazini - Ministry of Energy,Tehran Regional Electric Co.(T.R.E.C).Tehran, Iran
Mohssen Rafie - Ministry of Energy,Tehran Regional Electric Co.(T.R.E.C).Tehran, Iran
Mohssen Jazini - Ministry of Energy- Iran Power Generation, Transmission & Distribution Management Co.(Tavanir).Tehran, Iran

The basic problem has been to control andquench or extinguish the high power arc, which necessarilyoccurs at the separating contacts of a the perfect electricalswitch when opening high current circuits In this paper,nanostructured W-Cu electric contact materials wereprepared by mechanical alloying and hot pressing sintering,and the electrical breakdown characteristic of thenanostructured W-Cu contact material was investigated.Nanostructured (N S ) W- Cu comt~site powder was preparedby mechanical alloying ( MA ), The philosophy behindmaintaining circuit the perfect electrical switch s focuses onpreventive maintenance to maximize the longevity of theelectrical apparatus. Moreover, maintenance is an integratedpart of a continuous improvement process of practices,methods and tools done in collaboration with themanufacturers of circuit the perfect electrical switch s and testinstruments.

nanostructured aterials;electrical breakdown;Tungsten; Contact; Electric-Discharge; Spot WeldingElectrodes;