Current Transformer Tap Testing With Simultaneous Ratio Measurement
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Solution Overview
Problem
Conventional methods for testing current transformers are labor-intensive and time-consuming, requiring multiple tests for each winding combination in multi-ratio transformers, and often involve manual lead switching or incorrect tap identification.
Innovation Solution
A system and method for testing transformers that applies an input voltage to a secondary winding to induce a voltage in the primary winding, allowing simultaneous measurement of induced voltage and secondary voltages, phase angles, and calculations of winding ratios, enabling identification of all secondary taps and reduction of testing time through automated calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate tests are performed for each winding combination in multi-ratio transformers, then measurement precision is improved, but loss of time increases significantly
Solution Approach 1:
The patent combines multiple separate tests into a single concurrent test by connecting multiple voltmeters to measure primary and secondary voltages of different winding combinations simultaneously. This merging approach maintains measurement precision for each winding ratio while dramatically reducing the total testing time required for multi-ratio transformers.
Solution Approach 2:
The testing system is designed with multi-functionality to handle multiple winding combinations concurrently. By using a universal test setup with multiple voltmeters that can simultaneously measure different voltage ratios, the system eliminates the need to reconfigure test leads for each winding combination, thereby reducing time loss while maintaining precision.
2Device complexity
If manual lead switching is used to test different winding combinations, then device complexity is reduced, but productivity decreases
Solution Approach 1:
The patent merges multiple measurement functions into a single test setup by connecting multiple voltmeters simultaneously to the transformer windings. This eliminates the need for manual lead switching between different winding combinations, thereby increasing productivity without significantly increasing device complexity.
3Ease of operation
If test leads are changed manually for each tap combination, then ease of operation is maintained, but loss of time increases
Solution Approach 1:
The patent combines multiple measurement operations into a single simultaneous measurement process. By connecting multiple voltmeters to measure different winding combinations at the same time, the system eliminates the time-consuming manual lead switching process while maintaining ease of operation through a straightforward parallel connection approach.
4Reliability
If separate tests are performed for each winding combination, then reliability of individual measurements is improved, but productivity decreases
Solution Approach 1:
The patent merges multiple reliable measurement operations into a single concurrent test by using multiple voltmeters to simultaneously measure primary and secondary voltages across different winding combinations. This approach maintains the reliability of individual measurements while significantly increasing testing throughput and productivity.
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
The system significantly reduces testing time by calculating ratios, saturation curves, and knee points for each winding combination in a single test, while automatically identifying taps, even if they are not visibly labeled, thereby improving efficiency and accuracy.
Implementation Method 1
applying an input voltage to a secondary winding of the transformer in order to induce a voltage in a primary winding of the transformer
Data Source
AI summary
A system for testing a transformer includes a voltage source configured to apply an input voltage to a secondary winding of the transformer, the input voltage is configured to induce a voltage in a primary winding of the transformer. A primary voltmeter is configured to measure the induced voltage in the primary winding, a plurality of secondary voltmeters configured to measure voltage in a plurality of secondary windings of the transformer, and one or more phase angle meters to simultaneously measure a plurality of phase angles between the primary voltage and each of the plurality of secondary voltages. A controller is connected to the voltage source, the primary voltmeter, the plurality of secondary voltmeters, and the one or more phase angle meters, the controller is configured to calculate a plurality of winding ratios based on the voltage and phase angle measurements, the controller is also configured to identify all secondary taps.