Electricity Meter Self-Calibration via Feedback Loop
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Solution Overview
Problem
Conventional electricity meter calibration is a time-consuming and labor-intensive process that requires multiple manual adjustments and extensive external test equipment, especially for low current and multiple gain settings, due to gain errors and phase delays introduced by electronic components.
Innovation Solution
A system and method within the electricity meter that includes a reference component to generate accurate reference powers, a sampling component to digitize voltages and currents, a feedback loop with a proportional-integral (PI) component to calibrate gain and phase angles, and a processor to store and apply calibration values, allowing for self-calibration and minimizing external test equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional manual calibration methods are used, then measurement accuracy can be achieved, but the calibration process becomes time-consuming and labor-intensive
Solution Approach 1:
The meter performs self-calibration by automatically comparing its measurements against known reference values stored in memory, eliminating the need for manual operator intervention and significantly reducing calibration time while maintaining accuracy
Solution Approach 2:
The system uses feedback mechanisms where the meter continuously compares its measurements with reference values and automatically adjusts its calibration parameters to minimize measurement errors, achieving both accuracy and automation
2Measurement precision
If conventional calibration methods are used, then accurate calibration can be achieved, but extensive external test equipment is required
Solution Approach 1:
The calibration reference values and calibration logic are extracted from external test equipment and embedded directly into the meter's memory and processing unit, eliminating the need for complex external calibration equipment
Solution Approach 2:
The meter's processor and memory are designed to serve multiple functions including both normal measurement operations and self-calibration operations, reducing the need for separate dedicated calibration equipment
3Measurement precision
If manual adjustments are made during calibration, then measurement accuracy can be improved, but the calibration process becomes labor-intensive
Solution Approach 1:
The meter automatically performs calibration adjustments using its processor to compare measurements with reference values and modify calibration parameters without requiring manual operator adjustments, improving both ease of operation and consistency
Solution Approach 2:
Manual mechanical adjustment procedures are replaced with automated electronic calibration routines executed by the meter's processor, eliminating the need for physical adjustments while maintaining measurement accuracy
Data Source
AI summary
A system is provided for calibrating a device. The system includes a reference component, a sampling component, a calibration component, a comparing component and a proportional integral component. The reference component provides a reference power signal based on a voltage instruction and a current instruction. The sampling component samples a voltage signal to obtain a sampled voltage value and samples a current signal to obtain a sampled current value. The calibration component generates a calibrated power signal based on the sampled voltage value and the sampled current. The comparing component generates an error signal based on the reference power signal and the calibrated power signal. The proportional integral component and the calibration component are a feedback system that is operable to calibrate the gain of the sampled voltage and the sample current based on the error signal.