Relative Phase Angle Identification for Power Distribution Nodes
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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 operation continues, but accurate phase identification at each distribution location cannot be achieved
Solution Approach 1:
The system transmits a synchronization signal before measuring the zero-crossing duration. This preliminary action establishes a reference time point, allowing each node device to accurately measure the duration from the synchronization signal to its local zero crossing, thereby enabling precise phase identification through time-based comparison rather than direct phase measurement
Solution Approach 2:
The patent introduces an intermediary measurement approach by using duration values as a mediator between the synchronization signal and phase identification. Instead of directly measuring phase angles, the system measures the time duration from a common synchronization signal to local zero crossings, converting a difficult phase measurement problem into a more manageable time duration comparison problem
2Reliability
If phase determination systems are implemented across multiple node devices, then phase identification capability is improved, but system complexity and communication requirements increase
Solution Approach 1:
The system divides the phase determination task into independent segments at each node device. Each node device independently receives the synchronization signal, independently measures its own zero-crossing duration, and independently determines its phase by comparing with reference duration values. This segmentation allows distributed phase identification without requiring complex centralized control or inter-node communication, reducing overall system complexity while maintaining reliability
Solution Approach 2:
Each node device performs self-service phase identification by autonomously measuring its own zero-crossing duration and comparing it with reference values. The node devices do not require complex interactions with each other or with a central controller to determine their phases, as each device independently completes the measurement and determination process using locally available information and simple comparisons
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.