Current Collector Lowering Detection Through Arc Current Analysis
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Solution Overview
Problem
Current collectors on vehicles, particularly rail vehicles, can lower due to snow, ice, or mechanical defects, leading to arcing and potential damage to components, which is not effectively detected in existing systems, especially when stationary.
Innovation Solution
Detect a current collector lowering by analyzing electric current intensity and frequency components using a low-pass filter to identify unstable arcs, initiating protective measures such as current interruption or warning signals to prevent further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the current collector is lowered from the contact line during stationary conditions, then the vehicle can reduce energy consumption or perform maintenance, but arcs form between the contact line and current collector causing damage and safety hazards
Solution Approach 1:
The system performs preliminary detection of current collector position using current intensity measurements before the vehicle departs or resumes operation. By detecting the lowered state in advance through analysis of current characteristics (DC component or low-frequency AC component), the system can warn operators and prevent harmful arcs from forming when the vehicle is put back into service, thus maintaining safety while allowing the collector to be lowered during stationary periods for energy savings or maintenance
2Object-affected harmful factors
If the current collector is lowered to avoid snow or ice loads, then component damage from snow/ice is prevented, but arcs form causing contact line breaks and safety hazards
Solution Approach 1:
The system continuously monitors the current intensity between the contact line and current collector, analyzing the signal to detect DC components or low-frequency AC components that indicate a lowered collector state. This feedback mechanism provides real-time information about the collector position, enabling operators to take appropriate measures (such as raising the collector or interrupting current supply) to prevent both snow/ice damage and arc formation, thus resolving the contradiction between avoiding external harmful factors and preventing self-generated harmful factors
3Device complexity
If no detection system is implemented, then the system remains simple, but arcs cause component damage and contact line breaks
Solution Approach 1:
The system uses the existing current measurement infrastructure already present in electric vehicles to detect the position of the current collector. By analyzing the current intensity signal (specifically the DC component or low-frequency AC component) that naturally flows during operation, the system enables detection functionality without requiring separate sensors or complex additional hardware. This self-service approach maintains system simplicity while providing the reliability needed to prevent arc damage and contact line breaks
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
Effectively detects and prevents arcing by identifying unstable arcs, enhancing operational safety and maintaining vehicle functionality without human intervention.
Implementation Method 1
A method using a determination device to measure electric current intensity and identify a current component with a low-pass filter, detecting unstable arcs formed when the current collector is lowered
Implementation Method 2
values of a current component, in particular a direct current component or an alternating current component, the frequency of which is below a predefined frequency, are determined. A determination can be carried out in particular with the aid of a (for example hardware- or software-based) low-pass filter
Implementation Method 3
If there is a contact break between the current collector (more precisely, between the contact element of the current collector) and the overhead contact line, an arc usually forms. An arc can damage the components involved, especially the contact line and the current collector and its contact element
Data Source
AI summary
A method is presented for detecting a lowering of a current collector of a vehicle, in particular a rail vehicle, from a contact line, the method comprising: determining values of the electric current intensity of an electric current that is transmitted or flows between the contact line and the current collector in a measuring period; determining values of a current component of the electric current with the aid of the values of the electric current intensity; detecting the lowering with the aid of the values of the current component and a predefined criterion. Furthermore, a corresponding apparatus and a vehicle comprising the apparatus are disclosed.