Rotor Field Winding Short Detection via Magnetic Flux Analysis
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Solution Overview
Problem
Current methods for detecting electrical shorts in synchronous machine field windings are not effectively automated, making it difficult to timely and cost-effectively identify the location, number, and severity of shorts, which can lead to overheating and vibration issues.
Innovation Solution
A computer-based system that collects and analyzes magnetic flux data from a generator using a magnetic flux probe, executing algorithms to identify and track electrical shorts in rotor field windings, presenting information on the location, number, and severity of shorts on a display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual analysis methods are used to detect electrical shorts in field windings, then the system complexity is low, but the detection speed and automation level are insufficient
Solution Approach 1:
The patent replaces manual analysis methods with an automated computer-based system that uses software algorithms to process magnetic flux data. The system automatically collects data from flux probes, processes it through computational algorithms, and identifies shorted turns without human intervention, thereby increasing automation level while managing system complexity through standardized computational processes.
Solution Approach 2:
The system performs self-diagnosis by automatically monitoring its own performance and detecting faults in the field winding. The computer-based system continuously self-monitors magnetic flux characteristics and autonomously identifies abnormalities indicating shorted turns, eliminating the need for external manual inspection and enabling continuous self-service monitoring.
2Measurement precision
If comprehensive analysis of magnetic flux data is performed to identify all shorted turns, then the measurement precision improves, but the processing time and computational resources increase
Solution Approach 1:
The patent segments the field winding into discrete coil turns and analyzes magnetic flux data for each segment independently. By dividing the continuous flux signal into discrete temporal and spatial segments corresponding to individual coil turns, the system can precisely identify which specific turns are shorted without requiring analysis of the entire winding at once, thereby improving detection precision while managing processing time through segmented processing.
Solution Approach 2:
The system performs preliminary data processing and feature extraction before final analysis. Magnetic flux data is pre-processed to identify characteristic patterns and anomalies, and turn identification algorithms are prepared in advance. This preliminary action reduces the computational burden during actual fault detection, enabling comprehensive analysis with reduced processing time.
3Reliability
If continuous monitoring is implemented to detect shorts in real-time, then the reliability of detection improves, but the energy consumption and data processing load increase
Solution Approach 1:
The patent implements periodic sampling of magnetic flux data at optimized intervals rather than continuous uninterrupted monitoring. The system samples flux data at periods determined by rotor rotation speed and operational conditions, processing data in discrete time windows. This periodic action maintains detection reliability by capturing fault conditions when they occur while significantly reducing energy consumption and data processing load compared to continuous monitoring.
Solution Approach 2:
The system dynamically adjusts monitoring parameters based on operational conditions. The sampling rate, analysis thresholds, and processing intensity are modified according to rotor speed, load conditions, and detected anomalies. During normal operation, the system uses lower processing intensity and optimized sampling intervals, while increasing monitoring density only when necessary, thereby maintaining reliability while minimizing energy consumption and data processing load.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables real-time, automated detection and monitoring of electrical shorts, reducing downtime by accurately identifying and quantifying shorts in rotor field windings, even under varying load conditions, and providing visual alerts for maintenance.
Implementation Method 1
A flux probe sensor is introduced in the air-gap between the rotor and stator to monitor the flux from the field windings of the rotor. The sensor generates a signal proportional to the rate of change of the electromagnetic flux in the air-gap.
Data Source
AI summary
A method for analyzing electrical shorts in field windings of a synchronous machine having a rotor using a magnetic flux probe, the method includes: monitoring flux signals generated by the flux probe wherein the flux signals are indicative of magnetic flux emanating from the field windings; electronically storing flux data obtained from the monitored flux signals and indicative of electrical shorts in the field windings; automatically analyzing the stored flux data to identify field windings having the shorts and to count the shorts in each identified field winding, and automatically displaying information identifying the field windings with shorts and a number of shorts in each field winding.


