Instrumented Pantograph Offset Detection System
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Solution Overview
Problem
Conventional pantographs equipped with sensors for detecting contact wire parameters in overhead electrical power lines face limitations due to limited space, reduced precision, fragility, and exposure to water and grease, necessitating improved detection systems that can operate efficiently at higher speeds and withstand mechanical stresses.
Innovation Solution
An instrumented pantograph with an offset detection system, featuring sensors positioned remotely from the friction strips via an offset device, allowing for a wider measurement field and robust mounting, including cameras and lasers, and protected from environmental factors by embedded boxes with plenum chambers, enabling efficient parameter detection and high-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are arranged directly on the bow friction strips, then the detection system can be compact, but the measurement precision is reduced and the sensors are exposed to water and grease splashes
Solution Approach 1:
The detection system is relocated from the traditional horizontal arrangement on the bow to a vertical arrangement above the pantograph structure. This dimensional change allows sensors to be positioned at a higher elevation, away from the harmful spray zone generated by friction strip contact with the catenary, while maintaining detection capability through vertical optical paths
Solution Approach 2:
A dedicated detection system structure with support elements is introduced as an intermediary between the bow and the sensors. This intermediate structure provides a stable mounting platform that isolates sensors from direct exposure to water and grease splashes while maintaining proper detection geometry
2Reliability
If sensors are mounted on the bow, then the structure is compact, but the structural mounting is fragile and requires reduced vehicle speeds
Solution Approach 1:
The detection system is repositioned vertically above the pantograph rather than being mounted on the bow itself. This vertical relocation to a different spatial dimension allows the system to operate at higher vehicle speeds by eliminating the fragile mounting constraints that limited speed in traditional configurations
Solution Approach 2:
A robust intermediate support structure with dedicated mounting elements is introduced between the pantograph frame and the sensors. This intermediary structure provides enhanced mechanical strength and stability, enabling reliable operation at higher vehicle speeds without the fragility issues of direct bow mounting
3Measurement precision
If sensors are positioned close to contact strips, then the structure is compact, but the detection field is reduced and measurement precision decreases
Solution Approach 1:
The detection system utilizes the vertical dimension above the pantograph to expand the detection field. By positioning sensors at a higher elevation with vertical optical paths, the system achieves both a wider measurement area and improved precision, overcoming the limitation of compact horizontal arrangements
Data Source
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AI summary
The present invention relates to an instrumented pantograph (1) configured to detect at least one parameter of a contact wire for an overhead power line of vehicles traveling along an axis of advancement (X), the pantograph comprising: - A frame (10) designed to be fixed on a vehicle, - An articulated system (20) extending from the frame, - A sensing head (30) having a transverse axis (Y) substantially perpendicular to the axis of advancement when the pantograph is fixed on the vehicle, and comprising a support shaft and a bow (32), the bow being provided with at least one friction strip and being connected to the articulated system by means of the support shaft, and - A detection system (5) comprising at least one parameter sensor and an offset device (500) configured to position the parameter sensor at a distance from the sensing head, offset from the axis of advancement.