Long Range Wireless Phasing Voltmeter Using GPS Synchronization
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Solution Overview
Problem
High-voltage distribution and transmission systems face challenges in accurately determining phase identification, especially over long distances and in damaged or disrupted systems, leading to errors in phase difference measurements.
Innovation Solution
A long-range wireless phasing voltmeter system that uses a signal containing voltage and phase information transmitted from a reference probe to a meter probe, utilizing a GPS clock frequency to generate a standard frequency for accurate phase difference determination, allowing for simplex communication and eliminating distance-dependent adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage signals are transmitted over long distances from reference probe to meter probe, then phase identification can be performed remotely, but distance introduces errors into the comparison of measurements
Solution Approach 1:
The patent introduces an intermediary signal processing system that includes a reference unit and a field unit. The reference unit generates a reference signal based on a stable frequency source, transmits it to the field unit, and the field unit compares the received signal with the local voltage measurement. This intermediary system allows remote phase identification while maintaining measurement accuracy by compensating for transmission distance effects through proper signal synchronization and comparison methods.
2Measurement precision
If conventional phase measurement systems are used over long distances, then phase difference can be measured, but the system complexity increases due to need for distance-dependent adjustments
Solution Approach 1:
The patent implements a self-service measurement system where the field unit automatically performs phase comparison without requiring external manual adjustments for distance-dependent errors. The system self-compensates by using synchronized reference signals and automatic signal processing, eliminating the need for operator intervention to correct for transmission distance effects.
Solution Approach 2:
The system incorporates feedback mechanisms where the reference unit continuously monitors and adjusts the reference signal based on received information from the field unit. This feedback loop allows the system to automatically compensate for any distance-induced measurement errors, maintaining accuracy without increasing operational complexity.
3Measurement precision
If full-duplex communication is used for phase measurement, then accurate signal transmission is achieved, but communication efficiency decreases
Solution Approach 1:
The patent extracts only the essential information needed for phase measurement from the full-duplex communication system. By using unidirectional signal transmission with proper synchronization, the system achieves the necessary measurement accuracy without requiring the bidirectional communication of full-duplex systems, thereby improving communication efficiency.
Data Source
AI summary
A long range wireless phasing voltmeter determines the phase difference between the time-varying voltage carried on a reference electrical conductor and another, field conductor. The voltage signal from the reference conductor is measured by a reference probe and compared by a first unit in communication with that reference probe to a precision 60 Hz signal generated from a GPS receiver. The phase difference between these, in the form of a nine-bit, audible signal using frequency shift keying to modulate the carrier frequency, is transmitted by the first unit to a second unit perhaps miles away. A receiver in the second unit decodes the signal and uses another precision 60 Hz signal generated from another GPS receiver to re-create a surrogate of the original reference voltage signal. This surrogate signal is forwarded to a meter probe that is measuring the signal on a field conductor. The meter probe can then compare the two signals to determine the phase angle difference between them.