Arc Detection via Light Intensity Ratio
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Solution Overview
Problem
Existing methods for detecting arcs in electrical systems often incorrectly identify harmless glowing gases as dangerous arcs, leading to unnecessary shutdowns, as the conditions for a dangerous arc (high current and bright light) can be mimicked by glowing gases escaping from switching devices.
Innovation Solution
A method and device that distinguish arcs from luminous gases containing metal vapor by measuring the intensity of light at specific wavelengths (300-400 nm and 650-750 nm) and determining the ratio of these intensities, using simple mathematical operations to assign the light to either an arc or a glowing gas, thereby avoiding false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If simple light intensity threshold detection is used, then the system is simple to operate, but it cannot distinguish between arcs and glowing gases
Solution Approach 1:
The patent segments the light detection into two distinct wavelength ranges (λ1 and λ2), measuring intensity separately for each range. This segmentation allows the system to capture spectral characteristics that differentiate arcs from glowing gases, improving identification accuracy while maintaining operational simplicity through automated ratio calculation and threshold comparison.
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 reliable differentiation between arcs and glowing gases, reducing false shutdowns and enabling more accurate monitoring of electrical systems by utilizing the distinct light spectra of arcs and glowing gases, with minimal technical complexity and susceptibility to faults.
Implementation Method 1
at least one light-sensitive element for detecting light in a surveillance area
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a method for distinguishing an arc from a luminous gas at least containing metal vapor, wherein light is sensed in a monitoring region (3) and a first intensity of the sensed light at a first wavelength λ1 is determined and a second intensity of the sensed light at a second, greater wavelength λ2 is determined. Furthermore, the ratio Iλ1 / Iλ2 between the first intensity Iλ1 and the second intensity Iλ2 is determined. Finally, the sensed light is associated with an arc if said ratio Iλ1 / Iλ2 is greater than a specifiable first threshold value and/or with a luminous gas at least containing metal vapor if said ratio Iλ1 / Iλ2 is less than a specifiable second threshold value. The invention further relates to a device (1) for performing said method.