Electrical design method for preventing direct current overhead contact system from being frozen

Abstract

The invention discloses an electrical design method for preventing a direct current overhead contact system from being frozen. The method comprises an electrical circuit design method and an electrical control design method. According to the anti-freezing electrical circuit design method, on the basis of a basic structure of a direct current traction power supply system, a direct current bus of adirect current traction substation continuously outputs a certain amount of current to the overhead contact system, the size of the current is adjusted through adjustment of the circuit input range ofthe overhead contact system, and contact lines are prevented from being frozen through the thermal power of the overhead contact system. An anti-freezing circuit is low in consumption, small in equipment input, free of addition of manpower and mechanical facilities and easy to realize in a project. According to an electrical circuit control method, circuit control logic, action criteria and a control logic principle are proposed, and the control method is simple, effective and reliable.

Description

technical field [0001] The invention relates to the technical field of anti-icing of an overhead catenary, in particular to an electrical design method for preventing freezing of a DC overhead catenary. Background technique [0002] In recent years, with the continuous extension and development of urban areas, new urban rail transit projects have begun to be constructed from the city center to the suburbs and new development zones or urban peripheral ring lines, and more and more ground elevated line types have been used. The matching catenary for powering electric locomotives adopts overhead network and DC 1500V power supply system. [0003] In order to meet the power demand of electric traction locomotives, the overhead catenary has a complex structure and many suspension wires. The existing catenary maintenance mode is to carry out power outage maintenance at night. At this time, if freezing rain occurs, the surface of the overhead catenary exposed in the wilderness will...

AI Technical Summary

Problems solved by technology

When the construction of elevated or ground operating lines increases, the urban public transport network will undertake greater passenger transport capacity. At the same time, the environmental conditions around the overhead catenary are complex, and the uncertainty of icing will also increase greatly. The insufficiency of existing deicing technologies will will be amplified in operation

[0005] (1) Traditional manual mechanical deicing only passively removes the frozen ice and cannot fundamentally prevent icing, but freezing rain weather conditions exist all the time, the number of catenary wires is large, and the amount of deicing is large, which is likely to be uneven during the deicing period Permanent secondary icing, resulting in the inability to accurately judge the deicing effect, bringing uncertainty to the normal recovery of operations

[0006] (2) Traditional manual mechanical deicing mainly includes passive manual icing, mechanical vehicle deicing and coating of antifreeze (deicing) agents. The deicing speed is slow, the manpower required is large, and the investment in deicing machinery is high

Therefore, on the one hand, the operating units are prone to insufficient manpower and mechanical facilities for deicing, which leads to failure to deal with them in time when icing occurs, which affects the normal operation order; on the other hand, the operation and maintenance personnel and facilities of urban rail transit lines are generally A single line is independently configured and managed, and may belong to different operation management companies, and it is also prone to duplication and waste of personnel and mechanical facility configuration

[0008] (3) Traditional manual mechanical deicing requires a lot of manpower and machinery to work on the catenary, which virtually increases a lot of management costs and working hours. To ensure the personal safety of personnel; on the other hand, it is necessary to prevent damage to the catenary by mechanical facilities and ensure the safety and stability of the catenary system

The existing traditional mechanical deicing cannot meet the operation's demand for fast and effective deicing in terms of deicing effect, work efficiency and cost input.

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