Acoustic Sensor Micro-Interface Abnormality Detection
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Solution Overview
Problem
Current methods for detecting micro-interface abnormalities in electrical connections, such as loose connections in switchgear or UPS systems, are costly, do not provide continuous monitoring, and expose operators to arc flash hazards, detecting faults only when bulk temperatures are elevated, rather than at the early stages of abnormalities.
Innovation Solution
A method using acoustic sensors to detect and analyze signals within an electrical system, employing an event time correlation algorithm to identify potential faults, and measuring contact resistance to locate micro-interface abnormalities, enabling continuous monitoring and early detection without exposing operators to hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated sensors (thermocouples) are installed at each electrical connection to detect faults, then detection reliability is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent applies universality by using a single acoustic sensor to monitor multiple electrical connections simultaneously. Instead of installing dedicated thermocouples at each connection point, the acoustic sensor serves as a universal monitoring device that can detect faults across the entire electrical system, thereby reducing device complexity while maintaining detection reliability
Solution Approach 2:
The patent replaces the mechanical/thermal sensing approach (thermocouples requiring physical contact and wiring) with an acoustic sensing approach. The acoustic sensor detects ultrasonic emissions from electrical discharges, substituting a mechanical sensor system with a non-contact acoustic field-based system, reducing installation complexity
2Object-affected harmful factors
If infrared scanning is used to detect loose electrical connections, then operator safety is improved by avoiding direct contact, but detection capability is limited to exposed joints and cannot provide continuous monitoring
Solution Approach 1:
The patent implements continuous monitoring by keeping the acoustic sensor permanently installed and operational within the electrical system. Unlike periodic infrared scanning, the acoustic sensor continuously detects ultrasonic emissions from electrical connections, providing uninterrupted monitoring and enabling immediate fault detection without exposing operators to hazards
Solution Approach 2:
The acoustic sensor acts as an intermediary that detects electrical faults through acoustic emissions rather than requiring direct visual inspection or physical contact. The sensor translates electrical discharge events into acoustic signals that can be monitored remotely and continuously, expanding detection capability beyond exposed joints
3Device complexity
If thermal monitoring methods are used to detect electrical faults, then simple detection is achieved, but faults are detected only at late stages when bulk temperature is already elevated
Solution Approach 1:
The patent applies preliminary action by detecting electrical faults at their early stages through acoustic emissions. Electrical discharges produce ultrasonic sounds before significant heat buildup occurs, allowing the acoustic sensor to identify problems preliminarily before they escalate into serious thermal issues, enabling preventive maintenance
Solution Approach 2:
The patent changes the detection parameter from thermal (temperature) to acoustic (sound frequency). By monitoring acoustic emissions rather than temperature, the system detects faults at earlier stages when acoustic signatures are present but thermal effects have not yet manifested, reversing the detection timeline
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 approach allows for continuous, cost-effective detection and location of micro-interface abnormalities in electrical connections, preventing overheating and ensuring operator safety by identifying issues before they escalate, and is applicable to various electrical systems including low and medium voltage switchgear and UPS.
Implementation Method 1
identifying a subset of the plurality of electrical connections by detecting an acoustic signal within the electrical system and analyzing the detected acoustic signal
Implementation Method 2
measuring a contact resistance of each of the subset of the plurality of electrical connections, and identifying at least one of the subset of the plurality of electrical connections as having a micro-interface abnormality based on the measured contact resistances
Data Source
AI summary
A method of detecting and locating a micro-interface abnormality within an electrical system having a plurality of conductors and a plurality of electrical connections includes identifying a subset of the plurality of electrical connections by detecting an acoustic signal within the electrical system and analyzing the detected acoustic signal and determining that the detected acoustic signal is indicative of an electrical fault, measuring a contact resistance of each of the subset of the plurality of electrical connections, and identifying at least one of the subset of the plurality of electrical connection points as having a micro-interface abnormality based on the measured contact resistances.