Dissolved Gas Analysis via Differential Thermal Detection
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Solution Overview
Problem
Conventional methods for monitoring dissolved gases in transformer oil, such as off-line dissolved gas analysis, suffer from inaccuracy and repeatability issues due to the complicated extraction process and assumptions involved in calculating gas concentrations.
Innovation Solution
A method and system that irradiate a sample fluid and a reference fluid with electromagnetic radiation of specific wavelengths to determine the concentration of dissolved gases without extraction, using a differential measurement arrangement to generate signals representative of the temperature changes in both fluids, and a processing subsystem to calculate the gas concentration based on these differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional off-line DGA methods are used to monitor dissolved gases, then gas concentration can be measured, but measurement precision deteriorates due to inaccurate extraction process and calculation assumptions
Solution Approach 1:
The patent replaces the mechanical extraction process with optical measurement. Instead of physically extracting gases from the fluid for analysis, the system uses optical sensors to directly detect gas concentrations in the fluid, eliminating the errors and uncertainties associated with extraction and calculation assumptions.
Solution Approach 2:
The patent introduces optical sensors as an intermediary to measure gas concentrations. The sensors detect gases through optical properties (absorption, scattering, or emission of light), providing a non-contact measurement method that avoids the complexities of traditional extraction and calculation methods.
2Measurement precision
If extraction process is used to analyze dissolved gases, then gas concentration can be determined, but device complexity increases due to complicated extraction procedure
Solution Approach 1:
The patent eliminates the mechanical extraction system entirely by using optical detection methods. The simplified system directly measures gas concentrations in the fluid without requiring extraction equipment, separating processes, or complex calculation routines.
Solution Approach 2:
The patent extracts the gas analysis function from the complex extraction process by using optical sensors that can detect gases directly in the fluid. This separates the measurement function from the extraction operation, allowing for simplified, direct concentration determination.
3Measurement precision
If traditional DGA methods are used, then gas analysis can be performed, but loss of time increases due to extraction and calculation requirements
Solution Approach 1:
The patent replaces time-consuming mechanical extraction and calculation processes with rapid optical measurement. The optical sensors provide direct, real-time detection of gas concentrations, eliminating the time required for extraction, separation, and computational analysis.
Solution Approach 2:
The patent enables continuous monitoring of gas concentrations through optical detection, allowing for real-time measurement without interruption. This continuous action eliminates the periodic extraction and analysis cycles inherent in traditional methods, providing ongoing data without time loss.
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 accurate and direct monitoring of dissolved gases in transformer oil without extraction, improving the accuracy and reliability of gas concentration determination.
Implementation Method 1
irradiating a sample fluid by electromagnetic radiation having a first wavelength range resulting in a first time temperature change of the sample fluid
Implementation Method 2
irradiating a reference fluid by a second wavelength range resulting in a first time temperature change of the reference fluid
Implementation Method 3
a plurality of sensing devices that generate signals that are representative of the change in the temperature of the sample fluid and the change in the temperature of the reference fluid
Data Source
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AI summary
A system 10, comprising at least one source 22 for irradiating electromagnetic radiation 24 into a sample fluid 16 and a reference fluid 18 resulting in a change in a temperature of the sample fluid 16 and a change in a temperature of the reference fluid 18, and a processing subsystem 42 that monitors and determines a concentration of a gas 20 of interest dissolved in the sample fluid 16 based upon a difference between the change in the temperature of the sample fluid 16 and the change in the temperature of the reference fluid 18, wherein the reference fluid 18 does not contain the gas 20 of interest, and the electromagnetic radiation 24 has a wavelength range corresponding to a spectral absorption range of the gas 20 of interest.