Calibrating Bridge Transformer Error Simulation
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Solution Overview
Problem
Existing systems for simulating transformer errors during bridge calibration face stability and resolution issues due to the small phase-shift angle and similar signal values, making it difficult to accurately measure ratio and phase angle errors.
Innovation Solution
A system with a signal source connected to a calibrated bridge through an attachment and summation node, where the source generates signals simulating the standard and error transformer signals, with the error signal phase-shifted, using a summation node to create a summation signal for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronized voltage sources or current sources are used to simulate transformer errors, then the calibration can be performed, but the stability and resolution of measurement points deteriorate due to small phase-shift angle and similar signal values
Solution Approach 1:
The patent introduces an intermediary summation node that combines the standard transformer signal and the error signal before they reach the bridge. This mediator allows the error signal to be amplified relative to the standard signal, creating a larger phase-shift angle and improving measurement stability without changing the fundamental calibration process
Solution Approach 2:
The patent changes the parameter of signal combination by using summation nodes to add the standard signal and error signal before bridge input. This parameter change transforms the small phase-shift angle problem into a larger effective phase shift, improving both stability and resolution of measurement points
2Measurement precision
If synchronized voltage sources or current sources are used to simulate transformer errors, then the calibration can be performed, but the resolution of measurement points deteriorates due to small phase-shift angle and similar signal values
Solution Approach 1:
The summation node acts as an intermediary that enhances the signal difference between standard and error inputs. By combining signals before the bridge, it creates a larger effective phase-shift angle, which directly improves the resolution of measurement points while maintaining stability
Solution Approach 2:
The patent applies parameter changes by modifying the signal combination method. Instead of directly inputting separate standard and error signals, it sums them first, changing the effective phase-shift parameter and thereby improving both resolution and stability simultaneously
Data Source
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AI summary
The subject-matter of the invention is a system and method for simulating transformer errors in calibrating bridges for measuring transformer errors. The system for simulating transformer errors in calibrating bridges for measuring transformer errors, comprising a signal source with a first output and a second output, and a calibrated bridge with a first input and a second input according to the invention, wherein the first output (N) of the source (Ź) is connected to the first input (N) of the calibrated bridge (MW) through an attachment node (Z) and the second output (B) of the source (Ź) is connected to the second input (X) of the calibrated bridge (MW) through a summation node (S). The first output (N) of the source (Ź) is also connected to the summation node (S) through the attachment node (Z). The method for simulating transformer errors in calibrating bridges for measuring transformer errors according to the invention, wherein a first signal is generated at the first output (N), the signal simulating the secondary signal of the standard transformer, and a second signal is generated at the second output (B), the signal simulating the error signal of the tested transformer. The first signal from the first output (N) and the second signal from the second output (B) are summed to create a summation signal fed to the input (X) of the calibrated bridge (MW). The second signal from the output (B) is phase-shifted with respect to the first signal from the output (N) by a phase-shift angle (β). The value of the error signal from the second output (B) and the phase-shift angle (β) are calculated from the formula.