Calculation and measurement of rail impedances applicable to remote short circuit fault currents

Impact of rail impedance intrinsic variability on railway system operation, EMC and safety

“…internal report). (1) 60.2 34.9 (3) [46] Generic (2) 45 43.8 [47] Generic (2) 53 38.6 [47] Generic (2) 60 33.0 [47] (1) Six different resistivity values measured along the rail cross section (2.57, 2.58, 2.62, 2.7, 2.75, 2.85 10 -7 Ω/m), giving an average DC rail resistance of 34.9 mΩ/km; (2) Not clear if measured values, no reference temperature; (3) Average value out of six sampled internal resistivity values.…”

“…Running rails are one of the key interface elements in an electric transportation system: they are the main element of the return circuit and affect the useful voltage value [1] available at the catenary (or third rail) rolling stock interface; as part of the return circuit they are a relevant impedance term to consider for the short-circuit current estimate [2][3][4] and they contribute to reduce the induction caused by the catenary current [5,6]; they are also unfortunately the coupling means of stray current onto the track fastening system, the rest of the infrastructure and third parties [6][7][8][9][10][11]; finally, they allow the detection of passing trains by means of track circuits [12][13][14][15][16][17][18][19].…”

Accurate track modeling for fault current on DC railways based on MATLAB/Simulink

“…The feed is separated by articulated neutral section insulator. [1] , J H He [1] ,J Hu [1] ,Z Q Bo [2] , M X Li [1] , T Yip [2] , A Klimek [2] [1] Beijing Jiaotong University, China [2] AREVA T&D Automation, UK A 978-1-4244-6551-4/10/$26.00 ©2010 IEEE…”

“…tests in Docklands light railway and Hong Kong MTRC, and made important analysis on FFT of current wave [2]. C. S. Chang uses MATLAB/Simulink to build model.…”

Simulation and protection algorithm development of sequential tripping in DC traction system

“…Many researches have been done on modeling of the DC railway system and the simulation of fault current in DC railway system [1], but most of the previous works are based on single end feeding arrangement [2]. Therefore, there is a need to extend the previous researches.…”