Non-Contact Energy Meter Calibration for Accurate Voltage Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing energy metering systems face inaccuracies in voltage measurement due to temperature and position dependencies of non-contact voltage sensors, requiring frequent recalibration and leading to unreliable power and energy calculations.
Innovation Solution
An energy metering assembly using a non-contact voltage sensor with calibration by a voltage meter and a controller that adjusts voltage measurements based on temperature and historical data, and a core for current measurement, enabling accurate power and energy determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a non-contact voltage sensor is used to measure voltage, then the measurement can be performed without direct electrical contact, but the measurement accuracy deteriorates due to temperature and position dependencies
Solution Approach 1:
The system uses a voltage meter to measure the actual voltage and feeds this information back to the controller. The controller then adjusts the non-contact sensor readings based on the difference between the sensor output and the actual voltage measurement, continuously correcting for temperature and position dependencies
Solution Approach 2:
The controller changes the calibration parameters of the non-contact voltage sensor based on temperature sensor readings and position information. By adjusting these parameters dynamically, the system compensates for environmental factors that affect measurement accuracy
2Measurement precision
If frequent recalibration is performed to maintain measurement accuracy, then measurement precision improves, but system complexity and time consumption increase
Solution Approach 1:
The system performs automatic self-calibration by comparing the non-contact sensor output with the voltage meter measurement. The controller automatically adjusts the sensor calibration parameters without requiring manual intervention, reducing operational complexity while maintaining accuracy
Solution Approach 2:
The system performs initial calibration during manufacturing and stores calibration data. This preliminary calibration provides a baseline that reduces the need for frequent recalibration during operation, simplifying the ongoing maintenance requirements
3Reliability
If temperature compensation is implemented to correct sensor drift, then measurement reliability improves, but device complexity increases due to additional temperature sensors and control logic
Solution Approach 1:
The controller serves multiple functions: it processes voltage measurements from both the non-contact sensor and voltage meter, reads temperature sensor data, performs calibration calculations, and outputs corrected voltage readings. This multi-functionality consolidates components and reduces overall system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides accurate and reliable power and energy calculations by correcting voltage sensor inaccuracies through calibration, reducing the need for frequent recalibration and enhancing measurement precision.
Implementation Method 1
taking a voltage measurement, via a non-contact voltage sensor, of one or more primary conductors
Implementation Method 2
taking a current measurement of a secondary conductor... determining a current value of the one or more primary conductors based on the current measurement of the secondary conductor
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
This disclosure relates generally to an energy metering assembly configured to measure current and voltage of a one or more primary conductors, the energy metering assembly comprising a core; a coil having a plurality of turns, the coil being positioned around the core when securing the core to the one or more primary conductors; a voltage sensor, the voltage sensor being configured to sense a voltage of a one or more primary conductors; and a controller coupled to the coil and the voltage sensor, the controller being configured to determine a voltage of the one or more primary conductors, determine a current of the one or more primary conductors, and responsive to determining the voltage and the current, determine the power carried by the one or more primary conductors.