Calibration System for Power Meters Using Intermediary Coupling
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Solution Overview
Problem
Power meters tend to drift and lose accuracy over time, requiring recalibration, which is often inconvenient and costly, especially in active electrical environments where removing the device for calibration is difficult and poses safety risks.
Innovation Solution
A power meter system that allows for recalibration without removing the device from the circuit, using a calibration power meter that can be electrically interconnected in parallel with the existing power meter to compare measurements and adjust for accuracy, utilizing a spatial translation interface for compatibility with different power meters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power meter is removed from circuit for calibration, then measurement accuracy can be restored, but safety risks increase and power usage is disrupted
Solution Approach 1:
A calibration power meter serves as an intermediary device that couples to the existing power meter through a coupling mechanism. This intermediary enables calibration functions to be performed on the installed power meter without removing it from the circuit, thereby maintaining safety while restoring measurement accuracy through comparative measurement and calibration data transfer.
2Measurement precision
If power meter is removed from circuit for calibration, then measurement accuracy can be restored, but power usage is disrupted
Solution Approach 1:
The calibration power meter acts as an intermediary that enables calibration while the power meter remains installed and operational. The coupling mechanism allows data transfer and calibration operations without interrupting the power monitoring function, ensuring continuous power usage and productivity.
3Measurement precision
If manufacturer recalibration is performed, then measurement accuracy is restored, but cost increases
Solution Approach 1:
The system enables self-service calibration by providing a calibration power meter that can be coupled to the existing power meter to perform calibration operations in-situ. This eliminates or reduces the need for costly manufacturer recalibration services, allowing users to restore measurement accuracy independently through the calibration interface and data transfer mechanisms.
4Measurement precision
If power meter is removed from circuit, then calibration can be performed, but installation complexity increases
Solution Approach 1:
The coupling mechanism serves as an intermediary interface that simplifies the calibration process by providing a standardized connection between the calibration power meter and the existing power meter. This coupling interface enables calibration operations without requiring removal or complex disassembly of the installed power meter, reducing installation complexity while maintaining calibration capability.
Data Source
AI summary
A system for calibrating a power meter may include mechanically detachably electrically engaging a first power meter with a second power meter. The first power meter may receive a first current input signal representative of a current level in a first conductor to a load and receive a first voltage input signal representative of a voltage level in the first conductor, and determine a first power level based upon the first current input signal and the first voltage input signal. A second power meter may receive a second current input signal representative of the current level in the first conductor to the load from the first power meter, receive a second voltage input signal representative of the voltage level in the first conductor to the load from the first power meter, and determine a second power level based upon the second current input signal and the second voltage input signal.