Abstract
In order to study deeply the cause of mal-operation of the current increment protection and then redo the setting calculation, the all-parallel AT traction network model and the simulation model of Electric Multiple Units (EMU) are established. Using the model that has been established and Simulink simulation tool, the situation while the EMU is being started, passing neutral section or the traction network has grounding fault with interruption was simulated. The simulation result show that the current increment when the EMU starting is significantly different from that situation when fault occurring. While the situation when the EMU passing neutral section is the opposite. So we can draw a conclusion that the current increment protection will not appear mal-operation when the EMU starting and when passing neutral section may appear mal-operation. Finally, the current increment protection setting principle has been improved, and its feasibility has been verified.
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