Defect Detector for Power Distribution Switches
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Solution Overview
Problem
Existing power distribution systems lack effective methods to detect potential defects in switches, particularly in three-phase delta-wye transformer systems, which can lead to malfunctioning or equipment damage, requiring manual inspection and potentially causing power outages.
Innovation Solution
A defect detection system that utilizes three-phase voltmeters to monitor voltage drops across feeder lines, generating alerts for potential defects in switches by analyzing voltage data for drops across multiple phases within a predetermined time, allowing for timely identification and inspection of faulty switches without direct monitoring of upstream transformers or transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual inspection methods are used to detect switch defects, then system complexity is reduced, but detection reliability and response time deteriorate
Solution Approach 1:
The patent uses voltage data as an intermediary indicator to indirectly detect switch defects. Instead of directly monitoring switch status, the system monitors voltage drops on downstream feeder lines, which serve as mediators that reflect switch health. This approach improves detection reliability while avoiding complex direct switch monitoring equipment.
Solution Approach 2:
The system enables the power distribution system itself to detect its own defects through automated analysis of voltage data from existing meters. The defect detector automatically identifies patterns indicating switch problems without requiring manual inspection, allowing the system to self-diagnose issues while maintaining simplicity.
2Measurement precision
If direct monitoring of upstream transformers or transmission lines is implemented, then detection precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent inverts the traditional monitoring approach by placing sensors downstream rather than upstream. Instead of directly monitoring switch status at the upstream location, the system monitors voltage conditions on downstream feeder lines and infers switch defects from these indirect measurements. This inversion achieves precise defect detection using simpler downstream equipment.
Solution Approach 2:
The system uses downstream voltage data as an intermediary to infer upstream switch conditions. By analyzing voltage drops on feeder lines downstream of the switch, the system precisely detects switch defects without requiring direct contact with or monitoring equipment at the upstream transformer or transmission line locations.
3Reliability
If comprehensive monitoring of all switches is implemented, then detection coverage is improved, but loss of time for data processing increases
Solution Approach 1:
The system implements partial monitoring by focusing only on detecting voltage drops that indicate switch defects, rather than comprehensively analyzing all possible parameters for each switch. By monitoring only the specific voltage drop patterns that signify problems, the system achieves comprehensive defect coverage while minimizing data processing time.
Solution Approach 2:
The system continuously collects and stores voltage data from feeder lines in advance, so when a defect occurs, the data is already available for immediate analysis. This preliminary data collection enables rapid defect detection without time-consuming real-time processing delays.
Data Source
AI summary
A defect detector can receives voltage data characterizing a three-phase voltage for each of a plurality of feeder lines. The defect detector generates an alert indicating that a potential defect exists at a switch upstream of the plurality of feeder lines in response to the voltage data indicating (i) a drop in two or more phases of voltage at a given feeder line of the plurality of feeder lines occurred within a predetermined amount of time of toggling of the switch or (ii) a drop in two or more phases of voltage on at least two or more feeder lines of the plurality of feeder lines has occurred.