Mobile Transformer Test Device for B-H Curve Analysis
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Solution Overview
Problem
Conventional transformer testing techniques provide limited information on the magnetic properties of a transformer's main inductance, hindering precise parameterization of equivalent circuit diagrams and fault detection.
Innovation Solution
A mobile transformer testing device that records the PH characteristic by impressing a direct or alternating current into the transformer's winding, monitoring current strength as a measure of magnetic field strength, and determining the time integral of voltage as a measure of magnetic flux density, allowing for detailed diagnosis of transformer conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional transformer testing techniques are used, then basic transformer parameters can be measured, but information on magnetic properties of the main inductance is limited
Solution Approach 1:
The transformer testing device is designed to perform multiple measurement functions including determination of transformer parameters, magnetic properties of the main inductance, and fault detection. By integrating these diverse measurement capabilities into a single device, the patent eliminates the need for separate specialized equipment while comprehensive information acquisition.
Solution Approach 2:
The device measures magnetic properties by varying operating parameters such as frequency and voltage levels during testing. By changing these parameters and observing the resulting characteristics, the device extracts comprehensive information about the magnetic properties of the main inductance without requiring complex additional hardware.
2Measurement precision
If additional measurement parameters for magnetic properties are acquired, then fault detection precision improves, but measurement time increases
Solution Approach 1:
The device employs periodic measurement cycles where multiple parameters are measured in sequence through automated control. By organizing measurements into efficient periodic cycles with optimized timing, the device achieves high measurement precision for fault detection while minimizing total measurement time through systematic data collection patterns.
Solution Approach 2:
The measurement system incorporates feedback mechanisms where previously obtained data is used to guide subsequent measurements. This allows the device to focus measurement efforts on the most critical parameters for fault detection, reducing unnecessary measurements and thereby decreasing total measurement time while maintaining high precision.
3Manufacturing precision
If comprehensive transformer testing is performed, then parameterization accuracy improves, but device complexity increases
Solution Approach 1:
The device integrates multiple measurement functions including determination of transformer parameters, magnetic properties, and fault detection capabilities into a single unified system. This multi-functional design enables comprehensive testing and accurate parameterization without requiring multiple separate devices, thereby avoiding the complexity increase that would result from using separate specialized equipment.
Solution Approach 2:
The patent combines various measurement and evaluation functions into a single integrated device. By merging the capabilities for measuring transformer parameters, determining magnetic properties, and detecting faults into one unified system, the device achieves comprehensive testing and accurate parameterization while avoiding the complexity that would arise from coordinating multiple separate devices.
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 more extensive characterization of transformer magnetic properties and automatic detection of faults, such as core damage or air gaps, improving the precision of parameterization and fault detection.
Implementation Method 1
the transformer test device is configured to induce a direct current or an alternating current as a test signal in at least one winding of the transformer
Implementation Method 2
A voltage drop across at least one winding of the transformer can be recorded as a test response. The time integral of this voltage can be determined using an integrator circuit or by sampling and numerical integration of the voltage. This time integral provides a measure of the magnetic flux density.
Data Source
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AI summary
The invention relates to a mobile transformer test device (10) for testing a power transformer (40), said transformer test device comprising connections (12) for the releasable connection of the transformer test device (10) to the power transformer (40). The transformer test device (10) has a source (6) for generating a test signal. The mobile transformer test device (10) has an evaluation circuit (6) in order to determine information regarding a B-H curve (50, 60) of the power transformer (40) on the basis of the test signal and a test response of the power transformer (40).