Current Transformer Calibration via Serial Number Memory
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Solution Overview
Problem
Current transformers in power meters suffer from phase and ratio errors due to core magnetization, requiring manual reprogramming for accuracy when replaced or added, which is inefficient and error-prone.
Innovation Solution
A current transformer system with a non-volatile memory storing a unique serial number, allowing for automated calibration via a server-based database that updates calibration data and notifies power meters for precise measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual reprogramming is used to update calibration data when current transformers are replaced or added, then the power meter can be calibrated, but the process is inefficient and error-prone
Solution Approach 1:
The current transformer automatically transmits its unique serial number to the power meter, and the power meter automatically retrieves and applies the corresponding calibration data from the database, eliminating the need for manual reprogramming and reducing human error
Solution Approach 2:
The system establishes a feedback loop where the power meter reads the serial number, queries the database for calibration data, and automatically updates the calibration factors, creating an automated closed-loop calibration process
2Extent of automation
If calibration data is stored in a database and automatically retrieved, then calibration efficiency is improved, but the system complexity increases
Solution Approach 1:
A database serves as an intermediary between the current transformer and the power meter, storing calibration data and enabling automatic retrieval through the serial number, thereby simplifying the overall system architecture despite the added automation
Solution Approach 2:
The system uses the serial number as a unique key to copy and transfer the appropriate calibration data from the database to the power meter, automating the calibration process without requiring complex manual procedures
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
Ensures accurate and efficient calibration of current transformers by automating data updates and maintaining up-to-date calibration factors, enhancing measurement precision and reducing operational downtime.
Implementation Method 1
The primary current flowing in the primary winding generates a corresponding secondary voltage and current in the secondary winding
Implementation Method 2
The current transformer is equipped with a non-volatile memory, which could be an Electrically Erasable Programmable Read-Only Memory (EEPROM), storing a unique identifying serial number
Data Source
AI summary
The present invention relates to a system for calibrating a current transformer, aimed at enhancing the accuracy of current measurements. The system comprises a current transformer equipped with a non-volatile memory, configured to store a unique identifying serial number. In conjunction with this, a power meter is set up to communicate with the current transformer. The power meter is fitted with a reading module designed to read the unique identifying serial number from the non-volatile memory of the current transformer. The system also includes a server, connected to communicate with the power meter. The server possesses a database that stores calibration data associated with the unique identifying serial numbers. The server is programmed to receive the unique identifying serial number from the power meter and transmit the corresponding calibration data back to the power meter, enabling precise calibration of the current transformer.