The aim of the work is to study influence length spark gap on energy input into discharge channel during its gas-dynamic expansion. Methodology. research carried out by numerical modeling process development at variable values and invariable other conditions. was set in range from 1 mm 20 mm. conducted using a model development, which takes account processes nonstationary expansion channel, tra...

The electric spark caused by pantograph-catenary (PC) electrical contact failure happens frequently, it is a kind of arcing phenomenon which can severely affect the current collection PC. theoretical analysis and modelling PC are tried. First, spots between their temperature rise analysed derived based on classical theory, respectively. mechanism discharge revealed through voltage difference, m...