Busbar Protective Wall Structure for Contact Wire Corrosion Control
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Solution Overview
Problem
Existing busbars in rigid overhead catenary systems are prone to galvanic corrosion due to water condensation, which leads to early failure, and existing solutions do not ensure even application of protective grease to prevent corrosion.
Innovation Solution
A busbar design with overlapping upper and lower protective walls that form a conduit for high-viscosity grease, preventing water flow and allowing even application, combined with draining holes and a dripping edge to manage water, reducing the risk of corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective walls are added to prevent water flow, then corrosion protection is improved, but device complexity increases
Solution Approach 1:
The protective wall is segmented into an upper wall and a lower wall that overlap each other, creating a conduit structure. This segmentation allows the protective paste to be contained in a specific volume while maintaining a relatively simple overall busbar structure. The segmentation resolves the contradiction by providing effective corrosion protection through the divided wall structure without requiring complete redesign of the entire busbar.
Solution Approach 2:
The protective paste is nested within the conduit formed by the overlapping upper and lower walls. This nesting approach allows the protective substance to be contained in a defined space within the busbar structure, providing corrosion protection while integrating the protective function into the existing busbar geometry rather than adding external complex components.
2Reliability
If grease is applied to protect contact wire, then corrosion protection is improved, but manufacturing precision is worsened due to uneven application
Solution Approach 1:
The conduit for containing protective paste is built into the busbar structure during manufacturing, before the contact wire is installed. The upper and lower walls are pre-positioned to create the protective paste containment volume. This preliminary action ensures that when protective paste is applied later, it is contained within the pre-formed conduit, guaranteeing even distribution and effective corrosion protection without requiring precise manual application.
3Reliability
If high-viscosity grease is used to prevent water flow, then corrosion protection is improved, but ease of operation is worsened due to difficult application
Solution Approach 1:
The protective paste containment conduit is located specifically at the critical area where water condensation occurs and where contact between the contact wire and busbar is most vulnerable to corrosion. By concentrating the high-viscosity paste in this specific local region rather than requiring widespread application, the solution maintains effective corrosion protection while reducing the operational effort required for application and maintenance.
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
The busbar effectively prevents water from reaching the contact wire, ensuring better corrosion protection and reducing the risk of premature failure by allowing easy application and containment of protective grease within the busbar's inner volume.
Implementation Method 1
prevent water condensing on the busbar within the inner volume to flow by gravity to the clamping tips
Implementation Method 2
The viscosity of the grease is high enough to prevent the grease to flow by itself or, during application, to invade the inner volume of the busbar through a gap between the upper wall and the lower wall
Data Source
Figure 1
Figure 2
AI summary
This busbar (120) for holding a contact wire (110) has a section comprising a base (122), from which two holding arms (124) are extending downward, each comprising a clamping portion (128) configured to clamp onto the contact wire (110). The two holding arms (124) delimit an inner volume (V120) of the busbar (120). Each clamping portion (128) also comprises a protective wall (132), which extends within the inner volume (V120) and which is configured to prevent water condensing on the busbar (120) within the inner volume (V120) to flow by gravity to the clamping tips. For better protection of the contact wire, the two protective walls (132) include an upper wall (134) and a lower wall (136), which overlap each other and delimit a volume (V132) configured to be filled with a paste, such as grease.