Recloser Voltage Measurement Calibration via Self-Adjusting Divider
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Solution Overview
Problem
Existing high voltage measurement systems require unique ratio correction factors for each voltage sensor, which are cumbersome for end users to manage, especially when components are replaced, as they necessitate programming and coordination between different groups and access to proprietary software.
Innovation Solution
A junction circuit with a capacitive voltage divider and an adjustable impedance component, such as a dip-switch resistor array or digital potentiometer, is used to adjust the voltage gain of the voltage divider, eliminating the need for ratio correction factors by setting a target voltage ratio, thereby simplifying the calibration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a digital ratio correction factor is programmed into a controller to account for varying voltage ratios, then measurement precision is improved, but device complexity and ease of operation deteriorate due to required programming access and coordination
Solution Approach 1:
The voltage sensor system performs self-calibration by automatically determining the actual voltage ratio through measurement and comparing it to a target voltage ratio, then self-adjusting the voltage ratio adjustment component without requiring external programming or user intervention. This eliminates the need for users to access proprietary software or coordinate between different groups while maintaining measurement precision.
Solution Approach 2:
The system implements a feedback loop where the controller measures the actual voltage ratio, compares it to the target voltage ratio, and uses this feedback to automatically adjust the voltage ratio adjustment component. This closed-loop feedback mechanism ensures measurement precision while eliminating the need for manual programming of correction factors.
2Measurement precision
If a digital ratio correction factor is programmed into a controller to account for varying voltage ratios, then measurement precision is improved, but device complexity worsens due to proprietary software and programming cables
Solution Approach 1:
The voltage sensor system performs self-calibration by automatically determining the actual voltage ratio through measurement and comparing it to a target voltage ratio, then self-adjusting the voltage ratio adjustment component without requiring external programming or user intervention. This eliminates the need for users to access proprietary software or coordinate between different groups while maintaining measurement precision.
Solution Approach 2:
The system implements a feedback loop where the controller measures the actual voltage ratio, compares it to the target voltage ratio, and uses this feedback to automatically adjust the voltage ratio adjustment component. This closed-loop feedback mechanism ensures measurement precision while eliminating the need for manual programming of correction factors.
3Device complexity
If passive voltage divider components are used, then device complexity is reduced, but manufacturing precision worsens due to process variations affecting voltage ratios
Solution Approach 1:
The system dynamically adjusts the voltage ratio by changing the parameters of the voltage ratio adjustment component (such as resistance or capacitance values) based on the determined actual voltage ratio. This allows the system to compensate for manufacturing variations in passive components while maintaining a simple sensor structure, effectively decoupling structural simplicity from ratio consistency.
Solution Approach 2:
The system transitions from a static passive voltage divider to a dynamic configuration where the voltage ratio adjustment component can be modified based on measured performance. This dynamic adjustment capability allows the system to maintain simple passive components while achieving consistent voltage ratios through runtime calibration.
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
This solution allows for accurate voltage measurement without the need for ratio correction factors, simplifying the calibration and reducing the complexity of programming, as the voltage adjustment circuit adjusts the voltage ratio to implement a target voltage ratio, making the system more user-friendly and efficient.
Implementation Method 1
a capacitive voltage divider circuit may be used to scale down high voltages to levels that can be measured
Implementation Method 2
The voltage adjustment circuit includes an adjustable impedance component configured to adjust a voltage gain of the voltage adjustment circuit
Data Source
AI summary
A method of calibrating a recloser voltage measurement system. In one example, the recloser voltage measurement system includes a voltage divider and a voltage adjustment circuit. The voltage divider is electrically coupled to a recloser. The voltage adjustment circuit is electrically coupled to an output of the voltage divider. The method includes determining a first voltage measurement at a high voltage input to the recloser. The method also includes determining a second voltage measurement at an output of the voltage adjustment circuit. The method further includes calculating a difference between the first voltage measurement and the second voltage measurement. The method also includes determining a target voltage gain based on the determined difference between the first voltage measurement and the second voltage measurement. The method further includes adjusting a voltage ratio of the voltage divider by setting the voltage adjustment circuit to the target voltage gain.