Variable Reflector Gas Analysis for Transformer Dissolved Gases
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Solution Overview
Problem
Current dissolved gas analysis methods for monitoring insulating oil in transformers require oil removal and laboratory testing, which is inconvenient and may not provide real-time data on decomposition gases indicative of electrical faults.
Innovation Solution
An optical gas analysis apparatus with variable reflector configurations that adjust the optical path length and pressure within the sample volume, allowing for increased sensitivity in detecting trace amounts of decomposition gases by varying the number of passes of the optical radiation through the sample volume and reducing pressure broadening effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a direct optical path is used for gas analysis, then the device complexity is reduced, but the measurement precision decreases due to insufficient sensitivity for trace gas detection
Solution Approach 1:
The patent transforms a simple linear optical path into a multi-dimensional reflected path using mirrors. The optical beam is directed to reflect off multiple mirrors (e.g., four reflections) to create an extended effective path length through the sample gas, thereby increasing detection sensitivity without proportionally increasing device complexity.
Solution Approach 2:
Mirrors are introduced as intermediary elements to redirect and extend the optical path. These mirrors act as mediators that allow the light to traverse a longer distance through the gas sample without requiring a physically longer straight-line path, thus enhancing sensitivity while maintaining compact device geometry.
2Measurement precision
If the optical path length is increased to improve detection sensitivity, then the measurement precision improves, but the device complexity increases due to additional reflectors and alignment requirements
Solution Approach 1:
The patent uses a folded optical path design where mirrors redirect the beam in multiple directions (e.g., lateral and longitudinal reflections) to achieve an extended effective path length within a compact physical footprint. This dimensional folding allows high sensitivity detection without requiring a long linear device structure.
Solution Approach 2:
The mirror assembly serves multiple functions: extending the optical path length, defining the measurement volume, and potentially allowing for adjustable path configurations. This multi-functionality reduces the need for separate components and simplifies overall device architecture despite the complex optical path.
3Productivity
If real-time gas analysis is implemented, then the productivity is improved by eliminating laboratory testing, but the measurement precision may deteriorate due to environmental factors and operational complexity
Solution Approach 1:
The system enables self-contained real-time analysis within the transformer environment. The optical measurement cell is positioned to analyze gas directly from the transformer without requiring external laboratory equipment, allowing the system to serve itself with continuous monitoring capability that maintains precision through controlled measurement conditions.
Solution Approach 2:
The patent replaces mechanical/chemical laboratory analysis methods with optical detection. By using light absorption spectroscopy through the extended optical path, the system achieves rapid real-time measurement without the time-consuming processes of sample collection, transport, and laboratory analysis, while maintaining detection accuracy.
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 more sensitive detection of decomposition gases at lower concentrations, providing real-time monitoring of transformer health without the need for oil removal and laboratory testing, with improved accuracy and reduced complexity.
Implementation Method 1
a beam of optical radiation from an optical beam origin is directed to a detector location via the sample volume
Data Source
AI summary
An apparatus may have a first reflector and a second reflector positioned on either side of a sample volume for a gas sample. The configuration of the first reflector may be variable between at least first and second configurations, wherein each of the first and second configurations is arranged such that a beam of optical radiation from an optical beam origin is directed to a detector location via the sample volume. In the second configuration the beam of optical radiation is reflected at least once from each of the first and second reflectors and the path length of the beam of optical radiation through the sample volume is greater than in the first configuration.