Frequency-Adaptive Electricity Meter Calibration Across 50 Hz and 60 Hz Grids
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Solution Overview
Problem
Existing electricity meters designed for multiple frequency grids face increased manufacturing costs and reduced accuracy due to the need for manual calibration at each frequency and suboptimal 'median' calibration settings.
Innovation Solution
An adjustment method that automatically adjusts the measurement module of an electricity meter by acquiring the grid frequency and calculating appropriate calibration parameters, reducing the need for factory calibration at multiple frequencies and ensuring accurate measurements across different grid frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the meter is calibrated at multiple frequencies during factory calibration, then the meter can ensure required levels of accuracy at both 50 Hz and 60 Hz, but the duration of the calibration stage increases significantly and manufacturing cost increases
Solution Approach 1:
The patent applies preliminary action by performing factory calibration at a single reference frequency (50 Hz) and storing the calibration parameters in the meter. The meter then automatically detects the grid frequency during operation and applies the appropriate calibration parameters without requiring physical re-calibration at different frequencies during manufacturing.
Solution Approach 2:
The patent implements dynamics by enabling the meter to adapt its calibration parameters dynamically based on the detected grid frequency. The meter transitions from a static factory-calibrated state to a dynamic operation mode where it automatically adjusts calibration parameters according to whether the grid frequency is 50 Hz or 60 Hz, eliminating the need for manual re-calibration.
2Adaptability or versatility
If the meter uses median calibration parameters to operate over a wide range of frequencies, then the meter can be compatible with both 50 Hz and 60 Hz grids, but metrological accuracy is degraded compared with purely 50 Hz or 60 Hz meters
Solution Approach 1:
The patent resolves this contradiction by implementing dynamic calibration parameter selection. The meter detects the actual grid frequency and automatically switches between calibration parameters optimized for 50 Hz or 60 Hz, ensuring maximum measurement accuracy for the detected frequency while maintaining versatility across both frequency standards.
Solution Approach 2:
The patent applies feedback by having the meter detect the grid frequency during operation and use this feedback information to select the appropriate calibration parameters. This closed-loop approach ensures that the meter always operates with the most accurate calibration parameters for the detected frequency, rather than using suboptimal median parameters.
3Measurement precision
If the meter requires manual configuration to switch between 50 Hz and 60 Hz modes, then the meter can maintain accuracy for both frequencies, but the ease of operation is reduced and installation complexity increases
Solution Approach 1:
The patent implements self-service by enabling the meter to automatically detect the grid frequency and select the appropriate calibration parameters without requiring manual intervention. The meter performs self-configuration during operation by monitoring the grid frequency and autonomously adjusting its calibration settings, eliminating the need for technical personnel to manually configure the meter.
Solution Approach 2:
The patent uses feedback from frequency detection to automatically configure the meter's calibration parameters. The meter continuously monitors the grid frequency and uses this feedback to automatically switch between 50 Hz and 60 Hz calibration modes, providing intelligent self-adjustment without manual configuration requirements.
Data Source
AI summary
A method of adjusting an electricity meter (1), the method comprising the steps of:measuring the frequency of the distribution grid (3);if the difference between the frequency of the distribution grid and a first frequency is less that a first predetermined threshold, adjusting the measurement module (10) by using first calibration parameters that were produced during a stage of calibrating the meter;if the difference between the frequency of the grid and the first frequency is greater than or equal to the first predetermined threshold, calculating second calibration parameters from the first calibration parameters and from adaptation parameters, and adjusting the measurement module (10) by using the second calibration parameters.