Electric Railway Apparatus

ELECTRIC IMPEDANCE OF ASTERIAS EGGS Apparatus

Several years ago the absolute value of the al ternat ing current impedance of suspensions of Arbacia eggs was measured at frequencies from 1 to 15,000 kc. (Cole, 1928b). I t was concluded tha t the egg membrane capaci ty was not as near ly a static capaci ty as the capaci ty of the red blood cell membrane (Fricke, 1925 a, 1933), bu t was of the polarization impedance type, similar to tha t whi...

Embedded Fuzzy Logic Controllers in Electric Railway Transportation Systems

Power-Electronics Issues of Modern Electric Railway Systems

After de-regulation of the former state-owned railways and severe restructuring of the railway industry in the last 15 years, more innovative vehicle concepts saw the light of the day. Power electronics, already formerly being a pacemaker for progress of traction vehicles, brought forth an utmost standardization of the main drive by means of the IGBT-converter-fed induction motor drive. This is...

Sensitivity Analysis of Characteristic Parameters of Railway Electric Traction System

The modal analysis, which decouples the contact wire and rail track conductors, is used to develop an integrated model of single rail track and contact wire. The characteristic impedance and propagation constant matrices of integrated model have been computed. The authors have studied effects of various parameters of interest on characteristic impedance and propagation constant using sensitivit...

Validation of railway electric simulator using scale and slope performance indexes

When validating simulation models against experimental data, model adequacy and accuracy is quantitatively measured by performance indexes that quantify various kinds of distances between vectors: amplitude, slope, peaks, etc. Selected performance indexes are used to validate a simulation model against experimental data characterized by a very low uncertainty for the specific application, i.e. ...