Railway Power Supply Construction with Insulating Base
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Solution Overview
Problem
The existing electric traction network in railway systems, particularly in urban rail transit, suffers from stray current corrosion affecting infrastructure safety and longevity, and occupies significant space, leading to increased construction difficulties and costs due to the lack of complete insulation and the generation of step voltage.
Innovation Solution
A compact railway transportation power supply construction featuring an insulating base, power supply rail, return current rail, and insulating shield, along with power supply and return current arms coupled with a vehicle's bogie via insulation rings, forming an independent power supply loop that maintains contact without occupying additional space and prevents stray current and step voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the running rail is used as the return rail of the traction current, then the power supply system can be established, but stray current is generated causing electrochemical corrosion to the reinforcement structure and metal pipelines
Solution Approach 1:
The power supply system is segmented into two independent loops: the traction current loop (overhead contact network to running rail) and the return current loop (separate return rail to overhead contact network). This segmentation prevents the mixing of traction current and return current paths, eliminating stray current generation while maintaining power supply reliability.
Solution Approach 2:
A dedicated return rail is introduced as an intermediary component to carry the return current separately from the running rail. This intermediary structure provides a controlled path for return current, preventing it from leaking into the earth and causing corrosion to reinforcement structures and metal pipelines.
2Reliability
If the electric traction network uses overhead contact network and running rail, then power supply can be achieved, but it occupies large space and increases tunnel cross section requirements
Solution Approach 1:
The return rail is integrated with the overhead contact network structure, merging two separate components into a unified system. This integration allows the return current path to share the same spatial envelope as the power supply structure, eliminating the need for additional space and reducing tunnel cross section requirements.
Solution Approach 2:
The return rail is positioned in the vertical dimension above the running rail, utilizing the space above the track bed. This dimensional reorganization allows the return current path to occupy vertical space rather than horizontal space, maintaining power supply capability while minimizing the tunnel cross section.
3Reliability
If the running rail carries return current, then the power loop is closed, but step voltage is generated threatening personal safety
Solution Approach 1:
The return current function is extracted from the running rail and transferred to a dedicated return rail. This extraction separates the harmful effect (step voltage generation) from the necessary function (power loop closure), allowing the running rail to focus on mechanical support and traction current return while the return rail handles return current safely.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively eliminates stray current and step voltage, enhances power supply reliability, and extends equipment life while being economical and practical, allowing for uninterrupted power supply through junctions without altering the existing structure or landscape.
Implementation Method 1
an insulating base, a power supply rail, a return current rail and an insulating shield... The insulating shield is arranged on the top of the boss of the insulating base, the insulating shield covering the power supply rail and the return current rail
Implementation Method 2
the power supply arm has a front end connected to one end of an input port of the drive mechanism, and a terminal end in contact with the power supply rail... the return current arm has a front end connected to the other end of the input port of the drive mechanism
Data Source
AI summary
A railway transportation power supply construction comprising a power supply rail and a return current rail respectively secured on two sides of an insulating base and isolated by the insulating base. A power supply arm and a return current arm are mounted to a bogie of a vehicle and insulated from the vehicle body by means of insulation rings, the bogie provided with a drive mechanism. The power supply arm has a front end connected to one end of an input port of the drive mechanism, and a terminal end in contact with the power supply rail. The return current arm has a front end connected to the other end of the input port of the drive mechanism, and a terminal end in contact with the return current rail. During operation, the power supply arm has friction with the power supply rail to be powered, and the return current arm has friction with the return current rail, enabling the vehicle to travel through a junction section with uninterrupted power supply while the structure and operating condition of a junction remain unchanged.