Insulation Integrity Determination via Leakage Current Testing
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Solution Overview
Problem
Identifying latent failures in conductor segment insulation within electronic or vehicle assemblies is challenging, often detected only upon subsystem malfunction, and can lead to arcing events that pose safety risks, especially in combustible environments like aircraft fuel tanks.
Innovation Solution
A device comprising a switch, switch controller, and current sensor that applies a voltage to the conductor segment and measures leakage current to determine insulation integrity, allowing for frequent and automatic testing without disassembly, thereby minimizing arcing risks and enabling safer positioning of conductor segments near combustible components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation integrity testing is performed frequently and automatically, then safety against arcing events is improved, but device complexity increases due to additional switching and sensing components
Solution Approach 1:
The testing system is integrated into the existing operational circuit by merging the voltage source, switch, and current sensor with the conductor segment's normal operation circuitry. This allows insulation testing to be performed using the same electrical path during both testing and operational modes, reducing overall system complexity while enabling frequent automatic verification of insulation integrity.
Solution Approach 2:
The system performs insulation integrity testing before allowing operational electronics to connect to the conductor segment. By implementing preliminary testing through the switch controller that verifies insulation conditions beforehand, the system prevents arcing events from occurring during operation, thereby improving reliability without requiring complex real-time monitoring during active use.
2Reliability
If physical barriers and complex wiring installations are used to ensure safety, then protection against arcing is improved, but ease of manufacture deteriorates
Solution Approach 1:
The system replaces mechanical physical barriers and complex wiring installations with an electrical testing and monitoring system. Instead of using physical separation or complex routing to prevent arcing, the invention uses automated electrical testing through switches and current sensors to detect insulation degradation early, allowing simpler wiring layouts while maintaining safety through electronic verification rather than mechanical design.
3Device complexity
If latent insulation failures are not detected early, then system simplicity is maintained, but harmful effects increase due to undetected arcing events
Solution Approach 1:
The system implements continuous feedback monitoring of insulation integrity through the current sensor that detects leakage current during each switching cycle. The switch controller receives feedback from the current sensor about insulation conditions and can prevent operation or alert operators when insulation degradation is detected, creating a closed-loop system that automatically identifies latent failures before they cause harmful arcing events.
Solution Approach 2:
The testing system performs preliminary insulation verification before each operational cycle by switching to the testing position and measuring leakage current. This preliminary detection action identifies potential insulation failures before the conductor segment is energized for normal operation, preventing harmful arcing events from occurring during operation while maintaining relatively simple system architecture.
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 solution provides reliable and frequent verification of insulation integrity, reducing the risk of arcing and enabling intrinsically safe designs, which can reduce the need for physical barriers and complex wiring installations, ensuring safer and more compact systems.
Implementation Method 1
measuring a leakage current from the conductor segment using a current sensor positioned between the voltage source and the operational electronics
Data Source
AI summary
A device may include a switch having a first position in which the switch connects a voltage source to the conductor segment and a second position in which the conductor segment is connected to operational electronics. A device may include a switch controller configured to change the switch between the first position and the second position. A device may include a current sensor configured to detect a leakage current from the conductor segment when the switch controller causes the switch to be in the first position.