UV Sensor Structure for Online Furan Monitoring in Power Transformers
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Solution Overview
Problem
Current methods for monitoring Furans in transformer oil require offline sampling and laboratory analysis, which is time-consuming and not suitable for real-time monitoring, hindering timely decision-making regarding transformer maintenance and failure prediction.
Innovation Solution
An online sensor structure utilizing a UV light source, filter, and detector is integrated into a transformer tank, allowing UV light to pass through a transparent window and enabling continuous monitoring of Furans levels in the oil, with the detector providing a signal proportional to the Furan concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offline sampling and laboratory analysis are used to monitor Furans, then measurement precision is maintained, but loss of time increases significantly
Solution Approach 1:
The patent replaces the mechanical/chemical laboratory analysis system with an optical detection system. A UV light source illuminates the transformer oil, and a photodetector measures UV absorption at wavelengths characteristic of Furan compounds (220-280 nm). This optical substitution enables real-time monitoring while maintaining detection accuracy, eliminating the time delay inherent in offline sampling and laboratory HPLC analysis.
Solution Approach 2:
The patent introduces an optical intermediary system consisting of UV light and a photodetector as a mediator between the Furan compounds in the oil and the monitoring system. The UV light interacts with Furan molecules, and the photodetector converts the absorbed light into electrical signals proportional to Furan concentration. This intermediary optical measurement system provides real-time data without requiring physical sample extraction or lengthy laboratory processing.
2Productivity
If online monitoring is implemented, then productivity is improved through real-time data, but device complexity increases
Solution Approach 1:
The patent employs a UV light source that serves multiple functions: it provides illumination for optical measurement and its wavelength can be adjusted to detect different Furan compounds. The same optical path and photodetector system monitor both the presence and concentration of various Furan species. This multi-functionality reduces the need for separate detection systems for different parameters, thereby limiting the increase in device complexity while achieving comprehensive real-time monitoring.
Solution Approach 2:
The patent utilizes changes in optical parameters (UV absorption coefficient) to detect Furan concentration. By measuring the attenuation of UV light at specific wavelengths as it passes through the transformer oil, the system translates optical parameter changes into quantitative Furan level data. This parameter-based approach simplifies the sensor design compared to complex chemical analysis systems, enabling real-time monitoring with relatively simple optical components.
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 real-time, non-invasive monitoring of Furans levels, providing immediate insights into transformer health and potential aging or faulty conditions, facilitating proactive maintenance and reducing the risk of unexpected failures.
Implementation Method 1
Furans will absorb UV light, thus creating a difference in UV light received by the light detector
Data Source
Figure 1~2
Figure 3
AI summary
Sensor structure (16) is provided for online monitoring of levels of Furans in oil of a transformer tank. The sensor structure includes a UV light source (26), a filter (30) permitting only UV light of a certain wavelength range to pass, a window (32) permitting the filtered UV light to passes there-through, and a UV light detector (36) to receive UV light that passes through the window. When the sensor structure is mounted to the transformer tank that is online so that the window is exposed to oil, and Furans in the oil are being monitored, the Furans will absorb UV light, creating a difference in UV light received by the light detector when compared to the UV light received by the light de¬ tector when the monitored oil has no Furans therein. The output signal of the light detector is substantially proportional to a total of Furans in the monitored oil.