Power Network Fault Detection Using Subzone Current Correlation
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Solution Overview
Problem
Existing fault detection methods in electrical power networks rely on single-point measurements, leading to complex systems with numerous devices that are difficult to manage and often miss incidents due to the lack of dedicated detection applications, especially in large networks.
Innovation Solution
Determine linear dependencies between current signals in different subzones of the electrical power network using correlation coefficients to detect phenomena such as faults, utilizing a central intelligent electronic device to analyze current signals from multiple feeders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feeder-specific devices are used for fault detection in each feeder, then detection coverage is improved, but device complexity and system management difficulty increase significantly
Solution Approach 1:
The patent merges the fault detection functionality from multiple feeder-specific devices into a single centralized electronic device that analyzes current signals from all feeders simultaneously. This consolidation maintains comprehensive detection coverage while eliminating the complexity of managing numerous individual devices and their coordination.
Solution Approach 2:
The centralized electronic device performs universal fault detection across all feeders within a protection zone, replacing the need for dedicated feeder-specific devices. The device analyzes current signals from multiple feeders using the same computational methods, providing multi-functional capability that reduces overall system complexity.
2Reliability
If multiple feeder-specific devices are deployed to cover all feeders, then detection capability is improved, but ease of operation and event analysis become more difficult
Solution Approach 1:
The patent combines event analysis functionality into the centralized device, which automatically correlates events from multiple feeders and identifies root causes. This eliminates the need for operators to manually analyze events from numerous separate devices, significantly improving ease of operation while maintaining comprehensive detection capability.
Solution Approach 2:
The system provides integrated feedback by analyzing current signals from all feeders simultaneously and automatically determining the relationship between events. The centralized device processes information from multiple sources and presents unified fault information, making event analysis more straightforward and operationally easier.
3Measurement precision
If dedicated detection applications are implemented for each feeder, then detection accuracy for specific incidents is improved, but device complexity and computational requirements increase
Solution Approach 1:
The centralized electronic device implements a universal detection algorithm that analyzes current signals from all feeders using the same computational methods. This approach maintains high detection accuracy for various incident types while avoiding the need to deploy and manage multiple specialized applications, thereby reducing computational complexity and device requirements.
Data Source
AI summary
A method for detecting a phenomenon in an electrical power network including at least one protection zone with at least two subzones. The method including measuring in the subzones of the protection zone at least one current signal actual in the respective subzone, determining linear dependency between the at least one measured current signal actual in at least one subzone of the protection zone and the corresponding at least one measured current signal actual in at least one another subzone of the protection zone, and detecting the phenomenon in the protection zone of the electrical power network based on the at least one determined linear dependency.Furthermore, a system for detecting a phenomenon in an electrical power network.