Rail Vehicle Pantograph Contactor for Network Separation
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Solution Overview
Problem
DC rail vehicles experience jerking and electrical system breakdowns when driving over network separation points due to the distance between side current collectors, which can lead to substation trips and disruptions in power supply.
Innovation Solution
A rail vehicle equipped with a contactor that interrupts current flow between two current collectors when it exceeds a threshold, allowing the vehicle to safely traverse network disconnection points without causing substation trips, enabling a greater distance between pantographs and maintaining uninterrupted power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance between side current collectors is increased to allow the vehicle to bridge network separation points, then the vehicle can traverse disconnection points without interrupting power supply, but a fault can connect a grounded feed section to a non-grounded active feed section via the side current collectors, causing hazards or substation trips
Solution Approach 1:
A contactor is introduced as an intermediary device between the first and second side current collectors. This contactor monitors current flow and interrupts the electrical connection between the two current collectors when abnormal current exceeds a threshold, preventing direct connection between grounded and non-grounded feed sections while still allowing the current collectors to be positioned far enough apart to bridge network separation points.
Solution Approach 2:
The contactor performs preliminary protective action by continuously monitoring current flow between the side current collectors and preparing to interrupt the connection before a fault can propagate. The contactor is positioned to detect abnormal current conditions and act preemptively to prevent the connection of grounded and non-grounded sections, rather than waiting for the fault to manifest.
2Reliability
If the distance between side current collectors is reduced to prevent fault connections, then the risk of connecting grounded and non-grounded feed sections is minimized, but the vehicle cannot bridge network separation points, causing jerking and electrical system breakdowns
Solution Approach 1:
The contactor serves as a smart intermediary that enables the side current collectors to be positioned at an optimal distance - far enough to bridge network separation points smoothly, but with protective monitoring to prevent fault connections. The contactor dynamically controls the electrical connection based on current conditions rather than relying solely on fixed physical spacing.
3Ease of operation
If complex protective measures are implemented to allow rail vehicles to drive through network disconnection points, then the vehicles can traverse separation points safely, but the system complexity increases
Solution Approach 1:
Instead of implementing multiple complex protective systems, the invention uses a single contactor as an intermediary device with integrated current monitoring and interruption capabilities. This simplifies the protective measure from a complex multi-component system to a single, focused device that performs the essential protective function while enabling smooth traversal of network disconnection points.
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 contactor ensures smooth passage through network disconnection points, preventing substation trips and allowing for increased distance between pantographs, ensuring jerk-free operation and continuous power supply to the rail vehicle.
Implementation Method 1
The contactor (6) is set up to disconnect an electrical connection between the first current collector (1-4) and the second current collector (1-4) when a current flow through the contactor (6) exceeds a predetermined first threshold value
Data Source
Figure 1A~1B
AI summary
A rail vehicle is described that has a first pantograph (1, 2), a second pantograph (3, 4), and a contactor (6). The contactor (6) is electrically connected to the first pantograph (1, 2) and the second pantograph (3, 4) and is configured to interrupt the current flow between the first pantograph (1, 2) and the second pantograph (3, 4) when the current flow exceeds a first threshold and/or when an increase in the current flow exceeds a second threshold.