Fiber-Optic Arc Detection Assembly for Noisy Enclosures
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Solution Overview
Problem
Current arc detection methods face challenges in reliably detecting high-impedance arcing in high-voltage environments due to noise interference from current flowing in conductors and surrounding equipment, especially in semi-enclosed or enclosed spaces, where optical detection methods require multiple sensors and a dark environment to function effectively.
Innovation Solution
An arc detection assembly that incorporates an optical detection system with a fiber optic cable routed along conductors, featuring an optical element with a lens to receive arc light from multiple angles and a sensor that can identify arcing conditions, coupled with a controller to interrupt the arc-causing current and issue warnings, and an electrical device to open the circuit in response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical detection methods are used in high-voltage environments with current flowing in conductors, then arc detection capability is provided, but noise interference from current increases causing false positives and reduced reliability
Solution Approach 1:
The patent introduces fiber optic cables as intermediary elements that physically separate the detection system from the high-voltage environment. The fiber optic cable transmits optical signals from the arc detection location back to the sensor, allowing the sensor to remain outside the noisy electromagnetic environment while still detecting arcs at the electrical connection. This mediator isolates the sensitive sensor from harmful electromagnetic interference.
Solution Approach 2:
The patent replaces direct electrical sensing methods with optical sensing methods. Instead of using electrical sensors that would be susceptible to electromagnetic noise from high-voltage currents, the system uses optical sensors to detect the light emitted by arcs. This substitution of detection mechanism fundamentally eliminates susceptibility to electromagnetic interference while maintaining arc detection capability.
2Reliability
If multiple optical sensors are deployed to detect arcs in enclosed spaces, then detection coverage is improved, but device complexity and cost increase
Solution Approach 1:
The patent extends the detection system along the conductor path using fiber optic cables that can be routed to multiple electrical connections. Instead of placing multiple bulky optical sensors inside the enclosure, the system uses a single or few sensors outside the enclosure connected via fiber optics to multiple detection points. This transforms the spatial arrangement from three-dimensional sensor placement to a linear fiber optic routing approach, reducing complexity.
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
Enhances the reliability of arc detection in enclosures by reducing noise and false positives, enabling effective detection of both parallel and series arcs in challenging high-voltage environments, thereby improving safety in applications like aerospace and electric vehicles.
Implementation Method 1
an optical element within the enclosure with a line-of-sight to an engagement of the first and second terminal ends
Implementation Method 2
an optical detection system includes an optical element within the enclosure with a line-of-sight to an engagement of the first and second terminal ends and a sensor displaced from the enclosure and coupled to the optical element
Implementation Method 3
The sensor is configured to determine when the optical element senses an arcing condition between the first and second terminal ends
Data Source
AI summary
An arc detection assembly is provided and includes a first conductor comprising a first terminal end, a second conductor comprising a second terminal end, an enclosure to partially enclose a space in which the first and second terminal ends are engageable to form an electrical connection and an optical detection system. The optical detection system includes an optical element within the enclosure with a line-of-sight to an engagement of the first and second terminal ends and a sensor. The sensor is displaced from the enclosure and coupled to the optical element. The sensor is configured to determine when the optical element senses an arcing condition between the first and second terminal ends.