Capacitive Voltage Detection for Railway Contact Wires
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Solution Overview
Problem
Existing methods for detecting the voltage system of a rail vehicle require the pantograph to be in contact with the contact wire, posing safety risks and increasing construction effort, and often result in incorrect identification of the voltage system.
Innovation Solution
A device with at least two capacitive units and sensor elements, connected to a roof area via current measuring units, allows for contactless detection of the voltage system, eliminating the need for galvanic connection and reducing construction effort by using insulating holders for sensor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pantograph is used for voltage system detection, then the detection can be performed, but the pantograph must already be in contact with the overhead wire which increases safety risks and construction effort
Solution Approach 1:
The patent introduces a capacitive voltage divider as an intermediary measurement system between the overhead wire and the detection circuitry. This capacitive divider uses the pantograph structure and associated components to form capacitive dividers that can detect voltage system characteristics without requiring direct galvanic contact, thus reducing safety risks and insulation requirements while maintaining detection reliability
Solution Approach 2:
The patent replaces the traditional mechanical/electrical contact-based voltage detection method with a capacitive sensing method. Instead of requiring direct electrical contact and subsequent signal processing, the system uses capacitive coupling to detect voltage system characteristics, eliminating the need for complex insulation and reducing safety hazards
2Object-affected harmful factors
If each pantograph is insulated to isolate from highest operating voltage, then safety is improved, but the weight of insulators increases significantly
Solution Approach 1:
The patent extracts the voltage detection function from the pantograph's primary mechanical contact function. By using capacitive voltage dividers formed by existing pantograph components (such as the pantograph frame, contact elements, and associated structures), the system eliminates the need for heavy insulators on each pantograph, as the detection circuitry can operate at lower voltages through capacitive coupling
3Ease of manufacture
If a single capacitive unit is used for detection, then the construction effort is reduced, but the voltage system may be incorrectly identified due to secondary contact wire interference
Solution Approach 1:
The patent divides the detection system into multiple independent capacitive voltage divider units, each associated with specific pantograph components. By evaluating multiple measurement signals from different capacitive dividers simultaneously, the system can distinguish between voltage signals from the primary contact wire and those from secondary contact wires or other sources, thereby improving identification accuracy while maintaining relatively simple construction
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
Enables reliable detection of the voltage system before the pantograph is raised, preventing incorrect voltage system identification and reducing the weight and complexity of insulators, thus enhancing safety and efficiency.
Implementation Method 1
the measuring arrangement has at least one capacitive unit. The device comprises at least two measuring arrangements, wherein at least two capacitive units comprise the contact wire section and each a sensor element
Data Source
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AI summary
The invention relates to a device for detecting a voltage system that is connected to a contact wire section for a railway vehicle system, wherein the railway vehicle system comprises at least one railway vehicle in addition to the contact wire section, and the device has at least one measuring arrangement between a contact wire section and a roof area of the railway vehicle, which is connected to at least one evaluation unit, and wherein the measuring arrangement comprises at least one capacitive unit.In order to create a reliable detection of a voltage system in a contact wire for a rail vehicle, requiring only minimal construction effort and avoiding confusion of the contact wire with a secondary contact wire, the device comprises at least two measuring arrangements, wherein at least two capacitive units comprise the contact wire section and each a sensor element, and wherein at least two current measuring units each connect a sensor element to the roof area of the rail vehicle.