Relative Phase Angle Measurement for Power Distribution Phase ID
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Solution Overview
Problem
Accurately determining the phase associated with each distribution location in multi-phase power distribution networks is challenging, affecting maintenance and load balancing.
Innovation Solution
A system comprising gateway devices that transmit synchronization signals to node devices, receive duration values indicating zero crossing times, compare these values with known phases, and determine the phase of each device, facilitating phase determination and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional phase determination methods are used in multi-phase power distribution networks, then the system structure remains simple, but the phase identification accuracy deteriorates
Solution Approach 1:
A gateway device is introduced as an intermediary between node devices and the central system. The gateway receives synchronization signals, transmits them to node devices, and collects duration values from nodes. This intermediary structure enables accurate phase identification without requiring direct complex interactions between all network components, thus improving measurement precision while controlling system complexity.
Solution Approach 2:
The patent replaces traditional physical/mechanical phase identification methods with an electronic timing-based system. Instead of using physical phase indicators or manual identification, the system uses electronic synchronization signals and measures the time duration until zero-crossing detection. This substitution enables more precise digital measurement of phase characteristics while maintaining relatively simple network infrastructure.
2Measurement precision
If synchronization signals are transmitted to all node devices for phase determination, then phase identification accuracy improves, but the communication overhead and time consumption increase
Solution Approach 1:
The gateway device transmits a synchronization signal to all node devices before the actual phase measurement process begins. This preliminary synchronization ensures that all nodes are ready to detect zero-crossing events at the correct reference time point. By performing this preparation in advance, the actual measurement can be completed quickly without repeated synchronization attempts, thus improving accuracy while minimizing time loss.
Solution Approach 2:
The system uses periodic AC power cycles and zero-crossing detection to determine phase information. The synchronization signal is transmitted periodically with the AC cycle, and each node device detects zero-crossing events at regular intervals. This periodic approach allows efficient batch processing of phase information for multiple nodes without requiring continuous communication, reducing overall time consumption while maintaining accurate phase determination.
Data Source
AI summary
Systems for determining a phase of a device coupled to an electrical distribution system. The system includes a number of gateway devices configured to transmit a synchronization signal. The gateway device receives a node response message from a first node device that includes a duration value indicating a time between a receipt of the transmitted synchronization signal and a detected zero crossing. The gateway device compares the duration value against duration values received from node devices with a known phase connection and determines a phase of the first node device based on the comparison.