Conductive Shield Fault Detection in Aircraft Wiring
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Solution Overview
Problem
Electrical faults in insulated wiring, such as those in aircraft and automotive power distribution systems, are difficult to locate due to their invisibility and potential to occur anywhere along miles of wiring, often requiring complete replacement of wiring bundles instead of individual faulty wires, leading to unexpected circuit operations and potential failures.
Innovation Solution
An electrical fault detecting system with a conductor encircled by a sheath containing a conductive shield layer sandwiched between insulator layers, where a sensor monitors the shield's electrical characteristics and a controller compares these to threshold values to indicate faults, allowing for precise fault detection and location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete replacement of wiring bundle is performed, then reliability is improved, but loss of substance increases and productivity decreases
Solution Approach 1:
The wiring bundle is segmented into individual wires, each with its own fault detection capability through the conductive shield layer. This allows identification and replacement of only the specific faulty wire rather than the entire wiring bundle, reducing material waste while maintaining circuit reliability.
Solution Approach 2:
The conductive shield layer is pre-installed around each conductor during manufacturing, creating a built-in fault detection system before the wiring is deployed. This preliminary preparation enables rapid fault location and targeted replacement, preventing the need for complete wiring bundle replacement.
2Measurement precision
If sensor and controller are added to detect faults, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The conductive shield layer serves multiple functions: it provides electromagnetic shielding, mechanical protection, and fault detection capability. This multi-functionality reduces the need for separate detection components, maintaining measurement precision while limiting increases in overall system complexity.
Solution Approach 2:
The conductive shield layer itself serves as the sensing element by detecting changes in its own electrical characteristics when insulation fails. This self-service approach eliminates the need for complex external sensing mechanisms, achieving precise fault detection with minimal added complexity.
3Loss of time
If miles of wiring are inspected manually, then loss of time is reduced, but ease of operation worsens
Solution Approach 1:
Manual visual inspection is replaced with an electrical detection system that uses sensors and controllers to automatically detect faults through electrical characteristic changes in the conductive shield layer. This substitution dramatically reduces fault location time while maintaining operational simplicity through automated detection.
Solution Approach 2:
The detection system provides immediate feedback when a fault is detected by monitoring electrical characteristics of the conductive shield layer in real-time. This feedback mechanism enables rapid fault identification without manual inspection, reducing time loss while keeping the system easy to operate through automated alerts.
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 the detection of electrical faults before complete insulator failure, reducing the risk of shorts, heat, and fires, and allowing for targeted maintenance and rerouting of power, thereby enhancing safety and reducing maintenance costs.
Implementation Method 1
a sensor configured to electrically couple to the shield and output a signal corresponding to an electrical characteristic of electricity passing through the shield
Data Source
AI summary
An electrical fault detecting system (10) for a circuit includes a conductor (20) delivering an electrical signal from a source (12) to a destination (14), a sheath (22) encircling the conductor, and a fault detection circuit (18). The sheath further includes an electrical insulator layer (24) and a conductive shield (26) encircling the conductor. The fault detection circuit is configured to detect a change in the electrical characteristics of the conductor and/or conductor sheath.