Transformer Coil Selection for Resonant Overvoltage Withstand
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Solution Overview
Problem
Transformer breakdowns due to high-frequency overvoltages and resonant frequency oscillations are not adequately addressed by existing solutions, which often require additional components like surge arresters and RC filters, complicating installation and maintenance.
Innovation Solution
A method for selecting a transformer model using a computer system that models the transformer's coil, determines resonant frequencies, calculates the maximum electric field, and compares it with a maximum allowable value to select a model that can withstand these frequencies without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surge arresters and RC filters are installed to protect against overvoltages and resonant frequencies, then transformer reliability is improved, but device complexity increases
Solution Approach 1:
The patent uses numerical modeling and simulation to create a virtual representation of the transformer system, allowing breakdown risk assessment without physical prototypes or additional protective components. The model replicates the electrical behavior including resonant frequencies and overvoltage effects, enabling virtual testing and selection of transformers with appropriate characteristics before actual deployment.
Solution Approach 2:
The patent systematically varies transformer parameters such as winding configuration, core geometry, and insulation characteristics in the numerical model to identify configurations that inherently resist breakdown from overvoltages and resonant frequencies. By changing design parameters in simulation, the method selects optimal transformer specifications without requiring additional protective hardware.
2Reliability
If RC filters are installed to reduce voltage frequency away from resonant frequencies, then transformer reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent performs preliminary numerical analysis to determine the resonant frequencies of the transformer and the surrounding electrical installation before deployment. By calculating these frequencies in advance through the model, the system can select transformer parameters that avoid resonance conditions, eliminating the need for operational RC filters and simplifying both installation and maintenance.
3Measurement precision
If multiple transformer models are tested through physical prototyping, then selection accuracy is improved, but loss of substance increases
Solution Approach 1:
The patent replaces physical prototyping with a detailed numerical model that accurately replicates transformer behavior under various electrical stress conditions. The model allows virtual testing of multiple transformer configurations without consuming physical materials, thereby maintaining high selection accuracy while eliminating material waste and reducing economic costs associated with building and testing physical prototypes.
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 limits transformer breakdown risk by accounting for geometry and irregularities, reducing material and economic costs, and ensures the selected model can handle resonant frequencies effectively.
Implementation Method 1
calculation of a maximum electric field acting on the coil when a voltage oscillating over said frequency interval passes through the transformer model
Implementation Method 2
determination of a frequency interval comprising a set of resonant frequencies of the transformer model; Breakdown of the transformer may occur when the winding experiences a resonance phenomenon
Data Source
AI summary
A method for selecting a transformer model, the method being carried out by a computer system, the method including:—modelling a transformer model including a coil configured to support an electric field;—determining a frequency interval including a set of resonant frequencies of the transformer model;—calculating a maximum electric field acting on the coil when a voltage oscillating over said frequency interval passes through the transformer model;—comparing the maximum electric field with a maximum allowable electric-field value; and—selecting the transformer model as a function of the comparison previously carried out.