Rogowski Coil Calibration for Phase and Gain Accuracy
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Solution Overview
Problem
Current methods for calibrating Rogowski coil sensor systems are time-consuming, manual, and prone to inaccuracies due to phase shifts and amplitude variations, posing safety risks and requiring significant effort for characterization and calibration.
Innovation Solution
A method and system for automatic phase and gain calibration of current sensors using a microcontroller and analog-to-digital converters (ADCs), which involves converting current and voltage signals to digital signals, calculating phase angles, and adjusting preload parameters to reduce phase differences and improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration methods are used for Rogowski coil sensor systems, then calibration can be performed, but the process is time-consuming and prone to inaccuracies
Solution Approach 1:
The calibration system performs automatic self-calibration by computing correction factors from measured test data without requiring manual intervention. The microcontroller automatically processes voltage and current signals, calculates phase and gain errors, and generates calibration correction factors, enabling the system to calibrate itself efficiently and accurately.
2Reliability
If manual calibration procedures are performed, then calibration can be completed, but significant effort and expertise are required
Solution Approach 1:
The patent replaces manual mechanical calibration procedures with an automated electronic system. A microcontroller automatically performs signal acquisition, processing, and calculation of calibration parameters, substituting human operators with electronic computation to improve reliability and ease of operation.
Solution Approach 2:
The calibration system uses feedback by measuring actual voltage and current signals during calibration, comparing them against expected values, and automatically computing correction factors based on the measured deviations. This closed-loop feedback mechanism ensures reliable calibration without manual intervention.
3Measurement precision
If traditional calibration methods are used, then calibration can be performed, but phase shifts and amplitude variations cause measurement inaccuracies
Solution Approach 1:
The patent addresses phase shifts and amplitude variations by calculating and applying correction factors that adjust the measurement parameters. The system measures actual phase and gain deviations during calibration and computes correction factors that compensate for these parameter variations, thereby improving measurement accuracy.
Data Source
AI summary
A system and method for phase and gain calibration of a current sensor system. The system comprises a microcontroller configured to execute software in an energy measurement component and a calibration computer having a calibration application. The energy measurement component receives first and second digital signals representing current and voltage signals, respectively, received from a test source, and calculates active power and a power factor, and provides those values to the calibration computer. The power factor is converted to a converted phase angle. Based on the information received from the energy measurement component, the calibration application calculates parameters used to update components within the microcontroller to maximize the accuracy of the current sensor system.