A Segmented Design Method for Grounding Paths in Field Sections of DC Traction Power Supply System

Abstract

The invention provides a segmental design method for the grounding path of the field section of the DC traction power supply system. In the field section and the main line of the DC traction power supply system, and at the boundary between the field section and the outside of the field section, each grounding path is correspondingly set up in sections, divided into sections. Set the isolating switch at the section. The invention ensures that the grounding path between the main line and the field section, and between the inside and outside of the field section storehouse can be segmented, so as to prevent stray current from circulating through the grounding path.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and in particular relates to a segmental design method for field segment grounding paths of a DC traction power supply system. Background technique [0002] Due to energy saving, environmental protection, punctuality and high efficiency, urban rail transit has been increasingly vigorously developed at home and abroad, and DC traction power supply system occupies a relatively high proportion of applications. [0003] In the DC traction power supply system project, the stray current protection problem has always been one of the key points of the project. According to the research, due to the dense strands in the field section, the leakage resistance between the rail and the ballast bed is low, resulting in the stray current of the main line. Converge to the field section and then flow through the rails and return to the main line. [0004] At present, some projects in China have adopted measu...

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Problems solved by technology

[0004] At present, some projects in China have adopted measures such as one-way conduction devices for real-time conduction of vehicles at the rail insulation joints between the main line and the field section to reduce the concentration of stray currents to the depot. At the same time, a rail insulation joint and a single The method of cutting off the stray current flow path inside and outside the warehouse by the conduction device, but because the grounding path of the catenary overhead ground wire, the metal armor and shielding layer of the medium-voltage ring network cable, and the grounding flat steel is still in the above position, it is not clear at home and abroad. The specifications require disconnection, and according to the conventional design method, they are all designed to be in a connected state, which cannot effectively prevent stray current from flowing between the main line and the depot through the above-mentioned path

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