Electrical Phase Checking Apparatus for Metering Accuracy
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Solution Overview
Problem
Current electrical power meters face challenges in ensuring proper phasing of current transformers (CTs) with respect to voltage measurements, leading to incorrect energy readings due to mis-wiring, which can go undetected for days, resulting in higher labor costs and lost data.
Innovation Solution
An electrical phase checking apparatus with voltage and current sensors, along with binary indicators, such as LEDs, to quickly and easily verify if the phase separation between voltage and current waveforms is within acceptable limits, indicating correct or incorrect wiring through visual or auditory signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrical power meters are used without phase checking indicators, then the metering function is provided, but mis-wiring errors cannot be detected quickly leading to incorrect energy readings and lost data
Solution Approach 1:
The patent applies preliminary action by implementing phase checking indicators that verify correct wiring connections before the meter begins recording energy data. The visual indicators (LEDs) check phase alignment between voltage and current measurements upfront, preventing mis-wiring errors from going undetected during operation. This early verification ensures reliability of energy readings without requiring lengthy post-installation testing periods.
Solution Approach 2:
The patent implements feedback through visual indicators that immediately display whether phase connections are correct or incorrect. The LEDs provide real-time feedback to installers about wiring accuracy, allowing immediate correction of mis-connections. This feedback mechanism eliminates the time delay associated with discovering errors days later through data review, directly addressing the contradiction between reading accuracy and error detection time.
2Manufacturing precision
If detailed phase verification procedures are implemented, then wiring accuracy is improved, but installation complexity and time increase
Solution Approach 1:
The patent applies self-service by designing a system where the meter itself automatically performs phase verification and provides visual feedback without requiring external testing equipment or complex procedures. The built-in phase checking indicators autonomously assess wiring accuracy and guide the installer through simple visual cues, eliminating the need for sophisticated external verification tools while maintaining high wiring precision.
Solution Approach 2:
The patent uses color changes in LED indicators to communicate wiring status simply and intuitively. Different colors (e.g., green for correct, red for incorrect phase alignment) provide immediate visual information about wiring accuracy without requiring the installer to interpret complex measurements or procedures. This color-coded feedback system maintains high wiring precision while significantly simplifying the installation process and reducing procedural complexity.
3Manufacturing precision
If experienced technicians perform phase verification, then wiring accuracy is maintained, but installation cost and time increase due to labor requirements
Solution Approach 1:
The patent enables self-service by equipping the meter with automatic phase verification capabilities that eliminate the need for experienced technicians to perform manual checking. The visual indicators automatically assess phase alignment and guide less experienced installers, maintaining wiring accuracy without requiring specialized knowledge. This self-verifying system accelerates installation by removing the bottleneck of requiring skilled labor for phase verification.
Solution Approach 2:
The patent replaces the mechanical system of manual phase verification by experienced technicians with an automated electronic indication system. Instead of relying on human expertise and manual measurement methods, the system uses electronic sensors and visual LEDs to automatically detect and communicate phase alignment status. This substitution maintains precision while dramatically improving installation speed and reducing labor requirements.
Data Source
AI summary
An electrical phase checking apparatus includes a first voltage sensor, a first current sensor, a first binary indicator corresponding to the first voltage and current sensors, a second voltage sensor, a second current sensor, and a second binary indicator corresponding to the second voltage and current sensors. The first binary indicator is configured to indicate when a phase separation between a voltage waveform measured by the first voltage sensor and a current waveform measured by the first current sensor is not more than a first value, and the second binary indicator is configured to indicate when a phase separation between a voltage waveform measured by the second voltage sensor and a current waveform measured by the second current sensor is not more than a second value.