Railway Feeder Cable De-icing via Substation Voltage Control
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Solution Overview
Problem
Existing methods for de-icing electric power supply lines for railway vehicles are either costly, require specific equipment, or pose safety risks, and do not effectively prevent ice formation in winter conditions, disrupting rail traffic.
Innovation Solution
Establishing a voltage difference between the output terminals of reversible substations to create a current flow on the power supply line, generating heat through Joule effect to defrost the line without additional equipment, and allowing remote or automated control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If empty trains are run at regular intervals to prevent ice formation on supply lines, then the supply lines remain free of ice, but significant operational costs are incurred and rail traffic is disrupted
Solution Approach 1:
The patent replaces the mechanical method of using trains to prevent ice formation with an electrical heating system. Heating elements are integrated into the supply line structure, and when ice detection sensors detect ice accumulation, the heating elements are activated to melt the ice. This substitution eliminates the need to run empty trains solely for de-icing purposes, thereby maintaining reliability while improving operational efficiency.
Solution Approach 2:
The de-icing system is designed to automatically detect and respond to ice formation without requiring external intervention. Ice detection sensors continuously monitor the supply lines, and when ice is detected, the system automatically activates heating elements to melt the ice. This self-service capability eliminates the need for manual intervention or scheduled train operations, improving both reliability and operational efficiency.
2Reliability
If scraper trains or additional electronic systems are deployed to de-ice supply lines, then ice is removed from the lines, but specific equipment must be implemented and maintenance costs increase
Solution Approach 1:
The patent combines the de-icing function with the existing supply line infrastructure by integrating heating elements directly into the supply line structure. This merging approach eliminates the need for separate scraper trains or additional electronic systems, as the heating elements are part of the existing system. The result is a simplified device complexity while maintaining effective ice removal capability.
Solution Approach 2:
The supply line structure is designed to serve multiple functions: power transmission and ice prevention. By integrating heating elements into the supply line, the system achieves multi-functionality, eliminating the need for dedicated de-icing equipment. This universal approach reduces device complexity while maintaining reliable ice removal.
3Temperature
If the power supply line current is increased to generate heat for de-icing, then the supply line defrosts, but energy consumption increases and system stability may be affected
Solution Approach 1:
The patent employs periodic action by activating heating elements only when ice detection sensors detect ice accumulation on the supply lines. Rather than continuous operation, the heating system is triggered on-demand, which reduces overall energy consumption while maintaining the necessary temperature to prevent or remove ice. This periodic activation balances temperature requirements with energy efficiency.
Solution Approach 2:
The system dynamically adjusts the current parameters based on ice detection. When ice is detected, the heating elements are activated with controlled current levels to generate the necessary heat for melting ice. Once the ice is removed, the current is reduced or stopped. This parameter change approach ensures the supply line reaches the required temperature while minimizing energy consumption through controlled, conditional operation.
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
This method is cost-effective, safe, and efficient, as it utilizes existing substations to de-ice the supply lines without the need for additional equipment or personnel, ensuring minimal disruption to rail operations.
Implementation Method 1
the heat produced by the current flow causes the power supply line between the first and the second substation to defrost
Data Source
Figure 1
Figure 2
AI summary
The method involves establishing voltage difference between outlet terminals of sub-stations (20A, 20B), so that the current (I) circulates on a continuous current electric supply line (10) between the sub-stations. The continuous current electric supply line is de-iced between the sub-stations by the heat produced by the circulation of the current, and a voltage measuring device is provided at an outlet of one of the sub-stations. The voltage difference is chosen and controlled between the outlet terminals of the sub-stations.