Insulating Support for Tramway Power Supply Tracks
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Solution Overview
Problem
Existing insulating supports for tramway power supply tracks suffer from parasitic signal disturbances that interfere with the communication signal supported by the magnetic field of the detection loop, particularly due to the presence of conductive elements.
Innovation Solution
An insulating support with a unique central groove and symmetrical supply ducts arranged around a longitudinal median plane, made of pultruded fiberglass composite material, featuring a dovetail-shaped groove bottom and lateral flanges with magnetic detection loop cable ducts positioned to minimize interference, along with a manufacturing method involving pultrusion and assembly of elementary sections with increasing curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple parallel grooves with conductive and insulating bars are arranged in the support, then the power supply structure is established, but parasitic signals are generated that disturb the detection loop communication
Solution Approach 1:
The patent changes from a symmetrical arrangement of multiple grooves to an asymmetrical configuration with a single central groove. The groove is positioned exactly on the longitudinal median plane of the support, creating an asymmetrical layout that eliminates the parasitic signal generation caused by symmetrical conductive bar arrangements. This asymmetrical positioning disrupts the formation of parasitic current loops while maintaining power supply functionality.
Solution Approach 2:
The patent extracts and removes the problematic conductive bars from the support structure. Instead of having conductive and insulating bars arranged in parallel grooves, the solution uses a single groove that receives only the conductive track element, eliminating the source of parasitic signal generation while preserving the essential power supply function.
2Reliability
If conductive track elements are placed in grooves on the support, then electrical power supply is enabled, but electric arcing occurs between track elements
Solution Approach 1:
The patent introduces an intermediary insulating material that lines the groove and surrounds the conductive track element. This insulating intermediary prevents direct contact between adjacent conductive track elements, thereby eliminating electric arcing while maintaining the electrical power supply function. The insulating material acts as a mediator between the conductive elements, preventing harmful electrical discharge.
3Strength
If the support structure provides mechanical strength, then stability is achieved, but resistance to tilting forces is insufficient
Solution Approach 1:
The patent enhances the support structure by adding dimensional features that provide resistance to tilting forces. The groove has a specific depth and width configuration, and the insulating material extends vertically to provide lateral support. This dimensional enhancement transforms the structure from a simple horizontal support to a three-dimensional configuration that resists both vertical loads and tilting forces effectively.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The support (2) has a flat upper face (4) for receiving elements of a ground power supply track (3), and a flat lower face (6) that is in support on ground. A section is equipped with a longitudinal throat (12) arranged in the upper face. The section is equipped with a core (8) connecting the upper face to the lower face. The core is pierced with a longitudinal supply duct (24). The throat and supply duct are arranged, in central and symmetric manner, around a longitudinal median plane (5) of the support, where the plane is perpendicular to the upper face. An independent claim is also included for a method for fabricating an insulated support for a ground power supply track at a land transport system i.e. tramcar.