IED Phase Identification for Recloser Terminal Configuration
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Solution Overview
Problem
In electrical power systems, accurately identifying the phase associated with device terminals is challenging, particularly for reclosers that require proper connections to three-phase systems, which is crucial for proper control and protection but often difficult due to the complexity of voltage and current connections.
Innovation Solution
An apparatus and method using intelligent electronic devices (IEDs) to identify current and voltage phases by utilizing known phases and phase angles of other terminals, allowing for automatic phase and terminal identification and configuration, enabling correct execution of monitoring, control, and protection functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual phase identification methods are used for recloser terminals, then device complexity is reduced, but measurement precision and reliability of phase identification deteriorate
Solution Approach 1:
The system performs self-identification of phase assignments by automatically analyzing voltage and current signals. The recloser control device autonomously determines phase relationships without requiring external manual intervention or complex external identification equipment, thereby improving measurement precision while avoiding additional device complexity.
Solution Approach 2:
The patent replaces manual mechanical identification methods with electronic signal analysis. By using microprocessor-based analysis of voltage and current waveforms, the system achieves precise phase identification automatically, eliminating the need for manual testing equipment and procedures.
2Productivity
If automatic phase identification is implemented, then productivity and ease of operation improve, but device complexity increases
Solution Approach 1:
The recloser control device integrates multiple functions including protection, control, and automatic phase identification. By making the existing IED multi-functional, the system achieves automatic phase identification without adding separate dedicated equipment, thus improving productivity while minimizing the increase in overall device complexity.
Solution Approach 2:
The system automatically performs phase identification without requiring external identification equipment or manual procedures. This self-service capability accelerates installation and commissioning processes while utilizing the computational resources already present in modern IEDs.
3Measurement precision
If phase identification is performed using signal analysis, then measurement precision improves, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent replaces complex manual signal analysis procedures with automated microprocessor-based waveform analysis. The system electronically captures and analyzes voltage and current signals to determine phase relationships, achieving high measurement precision while simplifying the detection and measurement process through automation.
Data Source
AI summary
An apparatus and method for identifying the current and voltage phase and terminal for power system devices is described. In one aspect of the present invention, the respective current phase and terminal of two current terminals is identified based on a known phase and known phase angle associated with a third current terminal at the location of the electrical power system. In another aspect of the present invention, the voltage phase and terminal is identified based on a known phase and known phase angle associated with a third current terminal at the location of the electrical power system. In another aspect of the present invention, the respective voltage phase and terminal of three voltage terminals is identified based on known phase and known phase angles associated with first and second current terminals at the location of the electrical power system.