Rogowski Coil Current Sensor Calibration for Gain and Phase Accuracy
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Solution Overview
Problem
Calibrating Rogowski coil sensor systems is challenging due to inherent phase shifts and amplitude variations, requiring significant time and effort, and often involves manual, inaccurate methods that expose technicians to dangerous currents and voltages.
Innovation Solution
A method and system for automated 'one-touch' gain and phase calibration using microcontrollers and analog-to-digital converters, which calculate and adjust preload parameters to reduce phase differences and improve accuracy, eliminating manual steps and exposure to high voltage and current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual calibration methods are used, then technicians can directly adjust sensor parameters, but calibration time increases and technicians are exposed to dangerous currents and voltages
Solution Approach 1:
The system performs automated self-calibration using a microcontroller that automatically adjusts ADC preload parameters based on calculated phase differences, eliminating the need for manual technician intervention while maintaining calibration accuracy
Solution Approach 2:
The patent replaces manual mechanical adjustment methods with automated digital processing, using a microcontroller to calculate and apply calibration parameters digitally, thereby reducing calibration time and eliminating exposure to hazardous electrical conditions
2Measurement precision
If manual calibration methods are used, then technicians can adjust sensor parameters, but technicians are exposed to dangerous currents and voltages
Solution Approach 1:
The microcontroller acts as an intermediary between the test equipment and the ADC system, performing all calibration calculations and parameter adjustments digitally without requiring technicians to manually handle high-voltage test equipment or exposed circuitry
Solution Approach 2:
The patent replaces manual physical adjustment procedures with automated digital control, using software-based calibration algorithms that eliminate the need for technicians to physically connect to or adjust components in hazardous electrical environments
3Measurement precision
If traditional calibration procedures are used, then comprehensive calibration can be performed, but the process is complex and time-consuming
Solution Approach 1:
The patent combines gain calibration and phase calibration into a single integrated automated process, where the microcontroller sequentially performs both calibration types using the same test signal and calculation methodology, simplifying the overall procedure while maintaining comprehensive calibration coverage
Solution Approach 2:
The system automatically adjusts ADC preload parameters in discrete steps based on calculated phase differences, using systematic parameter changes to achieve precise calibration without requiring complex manual adjustment procedures
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.