Leakage Current Detection in Powered Electrical Systems
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Solution Overview
Problem
Existing powered electrical systems, such as those in aircraft, face challenges in detecting resistive heating element degradation before failure, which can lead to unusable metrics and safety issues due to icing conditions, especially in severe environments.
Innovation Solution
A system and method for measuring leakage current in electrical power cables using a high-frequency excitation signal induced at one location and sampled at another, comparing the response signal to a reference signal to detect impedance changes indicative of degradation, allowing for early identification of leakage paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional monitoring methods are used for resistive heating elements, then the system structure remains simple, but degradation cannot be detected before failure
Solution Approach 1:
The patent introduces an intermediary measurement system that uses a multimeter to measure leakage current between the resistive heating element and ground. This intermediary measurement approach enables degradation detection without requiring complex integration into the existing power system, thus improving reliability while minimizing additional complexity
Solution Approach 2:
The patent replaces direct electrical connection monitoring with an alternative measurement approach using leakage current detection. Instead of monitoring resistance changes directly in the heating element circuit, the system substitutes this with a separate measurement path that detects degradation through ground leakage current, enabling early failure detection
2Measurement precision
If continuous monitoring is implemented to detect degradation early, then detection precision improves, but energy consumption increases
Solution Approach 1:
The patent implements periodic measurement of leakage current rather than continuous monitoring. The multimeter measures leakage current at intervals, which provides sufficient detection precision to identify degradation trends while significantly reducing energy consumption compared to continuous monitoring schemes
Solution Approach 2:
The patent uses a measurement approach that exceeds minimum requirements by measuring leakage current to ground, which provides more information than strictly necessary for basic continuity testing. This partial excess in measurement capability enables early degradation detection while the periodic nature of the measurement keeps energy consumption acceptable
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 early detection of resistive heating element degradation, preventing failures and ensuring continuous operation by identifying changes in electrical dynamics within the powered electrical system, thus maintaining system reliability and safety.
Implementation Method 1
A high-frequency excitation signal is induced into an electrical power cable that provides operating power to a powered electrical system
Data Source
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AI summary
Apparatus and associated methods relate to detecting leakage current in a powered electrical system. Leakage current is detected by comparing a high-frequency response signal with a high-frequency reference signal. A high-frequency excitation signal is coupled, via an inducer (32), into the powered electrical system at a first location. The high-frequency response signal is sensed, via a signal sensor (34), at a second location of the powered electrical system. Because the electrical dynamics of the powered electrical system can change in response to system degradation that results in leakage current, changes in the high-frequency response signal can be indicative of leakage. Thus, the high-frequency response signal is compared, by a controller (36), with a high-frequency reference signal. The high-frequency reference signal can be a high-frequency response signal obtained at a reference time, at which the powered electrical system is operating without leakage.