Overhead Contact Wire Layout for Automatic Pantograph Disconnection
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Solution Overview
Problem
Existing overhead contact line systems for electric vehicles face limitations such as space requirements, warning signs for manual disconnection, and automatic disconnection at maximum height leading to arcing and wear, which are not feasible in tunnels or areas with height restrictions.
Innovation Solution
The system features laterally outward-extending contact wire sections that increase transversely along the direction of travel, ensuring automatic disconnection of the pantograph by contact with the wire ends, and includes a load break switch for controlled electrical disconnection before pantograph disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact wire height is raised with a safety margin to enable manual disconnection, then the pantograph can be disconnected before reaching height-limiting structures, but this requires sufficient distance in the direction of travel and ample installation space for catenary units, making it inapplicable in tunnels and areas with height restrictions
Solution Approach 1:
The patent transitions from vertical dimension (raising contact wire height) to lateral dimension (extending contact wire outward). The contact wire is extended laterally by at least 2 meters from its original position, creating a disconnection zone where the wire protrudes into the lane. This allows automatic disconnection without requiring additional longitudinal distance or vertical clearance, solving the contradiction between safe disconnection and space constraints in tunnels.
2Extent of automation
If the pantograph disconnects automatically at maximum working height, then disconnection is achieved without manual intervention, but this leads to arcing and increased wear on the contact wire due to abrupt disconnection
Solution Approach 1:
The patent implements preliminary action by extending the contact wire laterally before the pantograph reaches its maximum working height. The sensor detects the extended wire section in advance, triggering the lifting device to lower the support arm gradually. This preliminary detection and gradual disconnection process prevents abrupt contact loss, eliminating arcing and reducing wear on both the contact wire and contact assemblies while maintaining full automation.
3Ease of operation
If warning signs are installed to alert drivers to manually disconnect the pantograph, then disconnection can be achieved, but this requires driver attention and compliance, and manual disconnection may be forgotten or ignored
Solution Approach 1:
The patent implements self-service by making the disconnection process automatic and self-actuating. The sensor arrangement continuously monitors for the laterally extended contact wire section, and when detected, the control unit automatically activates the lifting device to lower the support arm. This eliminates the need for driver intervention, warning signs, or manual operations, ensuring reliable disconnection without depending on driver attention or compliance while maintaining ease of operation.
Data Source
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AI summary
The invention relates to an energy supply system (1) for feeding electrical energy into an electrically driven road vehicle (2) as it is driven along a lane (S) of a stretch of road. The energy supply system comprises a two-pole overhead line system (6) having contact wires (61) for providing electrical energy, the contact wires being arranged in parallel with a contact wire spacing (D1) from each other at a contact wire height (H) above the lane (S) along the stretch of road. The energy supply system further comprises a current collector (4) which is supported on the road vehicle (2) and has two contact assemblies (42), which are mounted on an articulated supporting linkage (41), a sensor arrangement (44), for detecting a contact wire (61) supported in an end section (E) of a working region (A) of a contact assembly (42), and has a control unit (45), which controls a lifting device (43) and is designed to initiate lowering of the supporting linkage (41) when the sensor arrangement (44) detects a contact wire (61) supported in an end section (E). According to the invention, at least one of the contact wires (61) has, in a wire-disconnection section (F) of the stretch of road, the wire-disconnection section being provided for releasing the electrical contact between contact assemblies (42) and contact wires (61), a section (68) running laterally outwards, wherein a distance (D8) between the contact wires (61), the distance being measured transversely to a direction of travel (V) of the lane (S), increases along the section (68) in the direction of travel (V).