Dynamic Braking Grid Resistance Monitoring for Early Short Detection
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Solution Overview
Problem
Dynamic braking systems in vehicles, such as rail and off-highway vehicles, face electrical shorts due to movement and thermal cycling of conductive resistive elements, leading to potential damage, overheating, and system failure, which existing technologies fail to detect early enough to prevent significant damage and downtime.
Innovation Solution
A detection system that monitors changes in electrical resistance by measuring conducted voltage and current ratios, using sensing apparatus and processing assembly to identify sudden variations indicative of shorts, allowing for early detection and preventative maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resistors are disposed relatively close together in conductive plates to dissipate current, then the efficiency of current dissipation is improved, but the risk of electrical short between resistors increases
Solution Approach 1:
The detection system performs preliminary monitoring of electrical resistance changes before actual short circuit damage occurs. By continuously measuring resistance variations and comparing them against baseline values, the system detects early signs of resistor movement or contact, enabling preventive action before the short circuit causes system failure or damage.
2Adaptability or versatility
If resistors are subjected to thermal cycling and vibrations during operation, then the dynamic braking system can handle varying operational conditions, but the resistors may move relative to each other causing internal electrical shorts
Solution Approach 1:
The detection system implements continuous feedback monitoring by measuring electrical resistance during operation and comparing it against expected baseline values. When resistance changes indicate resistor movement or potential contact, the system provides feedback signals to alert operators or trigger protective actions, maintaining system reliability despite thermal cycling and vibrations.
3Device complexity
If existing detection technologies are used, then the system can operate without additional complexity, but electrical shorts cannot be detected early enough to prevent significant damage and downtime
Solution Approach 1:
The detection system utilizes the existing electrical current flow through the resistors during normal operation to perform self-diagnostics. By measuring the voltage drop across resistors and calculating resistance values using Ohm's law, the system monitors resistor conditions without requiring separate test circuits or additional power sources, thereby minimizing added complexity while enabling early fault detection.
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 system effectively detects electrical shorts before they cause damage, enabling timely maintenance and preventing system failure, reducing downtime and operational risks.
Implementation Method 1
monitors changes in electrical resistance by measuring conducted voltage and current ratios
Implementation Method 2
measuring conducted voltage and current ratios
Data Source
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AI summary
Methods and systems detect short circuits in an electrical system (104), such as a dynamic braking grid of a vehicle. The methods and system measure a characteristic of a current that is conducted through one or more resistive elements (202) of an electrical system (104). The current is supplied to the electrical system (104) from a power source (102) as an applied voltage. A resistance change signal representative of a change in one or more electrical resistances of the one or more resistive elements (202) is determined. The resistance change signal can be based at least in part on a difference between the characteristic of the current that is measured and a low pass filtered value of one or more of the characteristic of the current that is measured or the applied voltage supplied by the power source (102). A short circuit event is identified based at least in part on the resistance change signal.