Phase Identification Using Waveform Digitization and Reference Comparison
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Solution Overview
Problem
Existing systems for determining the phase of a conductor in power distribution systems are unreliable, require frequent calibration, and are difficult to use, especially for electricians and utility crews who need a quick and easy method to identify phases across broad geographic areas.
Innovation Solution
A system comprising a reference unit and a field unit that sample and digitize voltage waveforms, allowing for full-cycle waveform analysis and comparison, with the ability to transmit and synchronize data using GPS or internal timing, and featuring capacitive sensor elements for accurate phase determination without the need for extensive calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional phase determination systems are used, then phase identification can be performed, but the systems are unreliable and require frequent calibration
Solution Approach 1:
The system performs self-calibration by using the reference waveform to automatically establish phase relationships. The field unit receives the reference waveform from the reference unit and uses it to calibrate itself automatically, eliminating the need for manual calibration operations and reducing calibration time while improving reliability through consistent reference-based measurement.
Solution Approach 2:
The reference unit captures and stores a reference waveform in advance before field measurements are taken. This preliminary action allows the field unit to compare subsequent field waveforms against a pre-established reference, eliminating the need for recalibration at each field location and enabling rapid, reliable phase determination.
2Ease of operation
If traditional phase determination systems are used, then phase identification can be performed, but they are difficult to use and require extensive training
Solution Approach 1:
The system automatically performs calibration and phase determination without requiring user intervention. The field unit autonomously receives the reference waveform, compares field waveforms against it, and determines phase relationships, eliminating complex manual calibration procedures and reducing the training needed for operators.
Solution Approach 2:
The system replaces manual calibration mechanisms with electronic waveform comparison. Instead of mechanical adjustment and manual calibration procedures, the system uses digital signal processing to automatically compare waveforms and determine phase relationships, significantly simplifying operation.
3Productivity
If rapid phase identification is implemented, then speed is improved, but accuracy may be compromised without proper calibration
Solution Approach 1:
The reference waveform is captured and stored in advance, establishing a accurate phase reference before field measurements. This preliminary calibration action ensures that subsequent rapid field measurements can be quickly compared against the pre-established reference, maintaining high accuracy while enabling fast phase determination.
Solution Approach 2:
The field unit automatically performs accurate waveform comparison and phase calculation without manual calibration. The system self-calibrates using the reference waveform and immediately proceeds to accurate field measurements, achieving both speed and precision through automated reference-based measurement.
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 a reliable, fast, and easy-to-use method for determining the phase of conductors, requiring only a single calibration that can be applied across a wide area, enhancing the accuracy and efficiency of phase identification in power distribution systems.
Implementation Method 1
The conductive sensor elements may comprise capacitive pickups, and may each have an output. The closed end of the second sensor element is typically placed on or close to the field conductor so that it capacitively couples to the conductor.
Data Source
AI summary
A system and method for determining the relative phase between current-carrying conductors. A reference unit samples and digitizes a voltage waveform at a reference location and transmits the digitized voltage waveform. A field sampling unit is placed on or directly adjacent a field conductor at a field location and transmits a signal representative of the voltage waveform of the field conductor. A field unit receives and digitizes the waveform received from the field sampling unit, receives the digitized voltage waveform from the reference unit, and compares the digitized field waveform and the digitized reference waveform. Also provided are methods for commissioning the phase identification system and calibrating the reference unit.