Motor Winding Fault Detection Using Sequence Current Comparison
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Solution Overview
Problem
Winding faults in multi-phase motors, such as phase-to-ground (PG) and phase-to-phase (PP) faults, reduce motor performance and can lead to damage, necessitating effective detection methods.
Innovation Solution
A method and system for determining winding faults by comparing sequence components of instantaneous currents in different sets of windings, using current sensors and a fault detector to identify differences exceeding predetermined values, and generating alarms for fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional winding fault detection methods are used, then the detection process becomes complex and time-consuming, but the detection accuracy and reliability remain insufficient
Solution Approach 1:
The patent extracts and compares only the zero-sequence components from the three-phase currents, isolating the specific feature that indicates winding faults. By focusing on this single extracted component rather than analyzing all current parameters, the system achieves high detection accuracy while maintaining simplicity in the detection algorithm and reducing computational complexity.
2Reliability
If comprehensive fault analysis is performed to distinguish between different fault types, then the reliability of fault detection improves, but the time required for analysis increases
Solution Approach 1:
The patent performs preliminary decomposition of three-phase currents into sequence components (positive, negative, and zero sequence) before fault occurrence. By pre-calculating and storing these components under normal operating conditions, the system can quickly compare real-time measurements against baseline values during fault events, enabling rapid and reliable fault classification without time-consuming analysis during critical moments.
Data Source
Figure 1A~1B
Figure 1C
Figure 2A
AI summary
Winding fault detection system (150) and method is provided. A first instantaneous current in first set of windings of the multi-wound electrical device (100) is received. A second instantaneous current in second set of windings of the multi-wound electrical device (100) is received. First sequence components are determined from the first instantaneous current. Second sequence components are determined from the second instantaneous current. The first sequence components are compared with second sequence components. A winding fault in the multi-wound electrical device (100) is determined when a difference in the first sequence components and second sequence components is greater than a predetermined value.