Transformer Insulation Moisture Measurement Using Temperature Sensors
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Solution Overview
Problem
Current methods for monitoring moisture content in transformer solid insulation are inaccurate due to assumptions of thermal equilibrium, which is rarely achieved in transformers with continuously changing temperatures, leading to incomplete assessment of moisture distribution within the insulation.
Innovation Solution
A system and method that utilize temperature sensors and a processor to calculate the actual water content in solid insulation by determining the relative moisture saturation of oil and using equations to account for temperature variations, allowing for precise measurement at specific locations within the transformer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional Karl Fischer titration method is used to measure water content in oil, then total water content in oil can be obtained, but the measurement does not reflect actual water content in solid insulation due to thermal non-equilibrium conditions
Solution Approach 1:
The patent changes the measurement parameters by introducing temperature as a critical variable. Instead of using fixed equilibrium curves, the system dynamically adjusts moisture content calculations based on real-time temperature measurements at multiple locations, transforming the measurement approach from static to temperature-dependent dynamic calculation
Solution Approach 2:
The patent introduces temperature sensors and a processor as intermediaries between the oil moisture measurement and the solid insulation moisture assessment. These intermediaries enable the system to account for thermal gradients and calculate actual moisture distribution in solid insulation without directly measuring it, bridging the gap between oil-based measurements and insulation condition assessment
2Productivity
If on-line moisture sensors are submerged in oil to continuously monitor moisture content, then real-time moisture data can be obtained, but accurate determination of solid insulation moisture content cannot be achieved due to temperature gradients and non-equilibrium conditions
Solution Approach 1:
The patent adds the temperature dimension to the moisture monitoring system. By measuring temperature at multiple locations and incorporating it into the calculation, the system transforms a one-dimensional moisture concentration measurement into a multi-dimensional assessment that accounts for thermal gradients, enabling accurate solid insulation moisture determination under dynamic conditions
Solution Approach 2:
The patent makes the moisture assessment dynamic by continuously updating calculations based on real-time temperature variations. The system adapts to changing thermal conditions throughout the transformer, converting the static equilibrium-based approach into a dynamic model that reflects actual operating conditions
3Ease of manufacture
If equilibrium curves are used to convert oil moisture content to paper moisture content, then moisture assessment can be performed, but location-specific moisture distribution within the transformer cannot be determined
Solution Approach 1:
The patent segments the transformer into multiple measurement locations, placing temperature sensors and moisture sensors at different positions. This segmentation enables the system to capture spatial variations in temperature and moisture, providing location-specific moisture assessment while maintaining a distributed sensor network architecture
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 accurate and location-specific determination of water content in solid insulation, accounting for temperature gradients and variations, thereby improving the assessment of insulation health and dielectric integrity.
Implementation Method 1
determining a temperature of the solid insulation at a specific location
Implementation Method 2
measuring capacitance that is then correlated to moisture content for the oil
Data Source
AI summary
Disclosed herein is a method that relates to determining water content of a solid insulation at a specific location within a transformer. The method comprising, determining a temperature of the solid insulation at a specific location, calculating a relative moisture saturation of the oil at the specific location, calculating the ultimate water content in the solid insulation at the specific location, and calculating an actual water content in the solid insulation at the specific location.