Rotating Machine Insulation Life Assessment Using Mahalanobis-Taguchi Method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for an effective technology to assess insulation deterioration and estimate the remaining life of Class-F insulation machines, which are the main targets for insulation updates in modern rotating electrical machines.
Innovation Solution
A method and device that acquire and analyze actual running performance and electrical data, including dielectric tangent, rapid current increase voltage, current increase rate, and maximum discharge charge amount, using association tables and the Mahalanobis-Taguchi method to calculate index values for estimating the residual withstand voltage and assessing the remaining life of rotating electrical machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional assessment methods for Class-B insulation machines are used, then existing technology can be applied, but these methods are not applicable to Class-F insulation machines which are the main targets for update
Solution Approach 1:
The patent develops a comprehensive assessment method that integrates multiple evaluation techniques (dielectric tangent measurement, rapid current increase method, partial discharge measurement, and MT method) into a unified framework that can assess both Class-B and Class-F insulation machines, making the system universally applicable to different insulation classes while maintaining high reliability through multi-parameter analysis
2Measurement precision
If multiple electrical parameters are measured and analyzed using association tables and MT method, then assessment precision is improved, but the complexity of the assessment device and process increases
Solution Approach 1:
The patent segments the assessment process into distinct functional modules: data acquisition unit for collecting electrical parameters, storage unit for maintaining association tables, index value calculation unit for computing deterioration indices, and remaining life estimation unit for predicting service life. This modular segmentation reduces system complexity by organizing multiple measurement and analysis functions into separate, manageable components while maintaining high assessment precision through integrated operation of all modules
3Measurement precision
If four different index values are calculated using multiple methods, then the remaining life assessment becomes more accurate, but the calculation process and data processing become more complex
Solution Approach 1:
The patent pre-calculates and stores association tables containing the relationships between electrical parameters and insulation deterioration before actual assessment. During operation, the system directly queries these pre-established tables rather than performing complex real-time calculations, significantly reducing assessment time while maintaining high precision through the use of pre-validated correlation data across all four index value calculations
Data Source
AI summary
A device for assessing remaining life of a rotating electrical machine includes: a data acquisition unit configured to acquire actual running performance data and electrical data about the rotating electrical machine to be assessed; an index value calculation unit configured to calculate a first index value to a third index value based on the acquired data, and to calculate, as a fourth index value, an estimation value of a residual withstand voltage value of the rotating electrical machine by performing analysis that uses an MT method on each piece of the electrical data; and an insulation deterioration estimation unit configured to assess the remaining life of the rotating electrical machine by estimating the remaining life of the rotating electrical machine with use of four index values from the first index value to the fourth index value.