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Locating high-resistance grounding faults poses a tough and challenging problem for the safety of DC railway systems. High-resistance grounding fault current isn't sufficient to trigger switches, which may expand the accident or turn into potential hazards. In order to overcome the limits of the existing methods (such as signal injecting method, resistance method and so), developing a novel fault...
This paper presents an accurate track modeling for fault current on dc railways based on MATLAB/Simulink. With the introduction of skin effect of short-circuit current, the simulation of short-circuit fault based on MATLAB/Simulink is proposed. By comparing and investigating the waveforms of remote short-circuit current with and without skin effect, the paper pointed out the difference between these...
This paper presents a simulation of articulated neutral section insulator in DC Railway System. With the introduction of Beijing subway structure, the special way of the connection of neutral section is proposed. By comparing and investigating the waveforms of locomotive passing neutral section current and starting current, the paper pointed out the difficulty of discrimination between remote short...
This paper presents two comprehensive models of DC subway traction system to simulate the starting-up process using Matlab/simulink. One is DC motor driven, the other is AC motor driven. The model includes substation rectifiers, the track and the different driven subway trains. The objective of the model is to study the short circuit faults and the train starting current. Analysis and conclusion of...
This paper presents a simulation and protection algorithm of DDL in DC traction system based on MATLAB/Simulink. With the introduction of the operation of DC traction system, this paper developed different models and implemented the simulation and test separately for different feeding arrangement and operation condition of DC power supply system, analyzed the characteristics of the typical train starting...
This paper presents a new current selective trip protection algorithm which is based on the current changes on the same end of line. The new algorithm can reduce the communication of transmission line pressure and reduce the length of the signal delay to the protection of the impact. With the introduction of the new algorithm, the typical AC power ring line for DC railway system based on PSCAD is...
This paper presents a simulation of regenerative braking in DC railway system. The model of DC locomotive with DC-AC PWM convertor has been proposed which is according to Beijing No.5 Line Subway train. Based on the data of a practical train, this paper has made calculation of regenerative braking currents. The calculation has verified the correctness of the simulation model.
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