Rotor Winding Fault Detection via Dual-Parameter Monitoring
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Solution Overview
Problem
Current methods for detecting rotor dynamic turn-to-turn short circuit faults in synchronous generators are inefficient and unreliable, making it difficult to maintain power grid stability and prevent costly generator shutdowns.
Innovation Solution
A detection system and method using a combination of three-phase current signals from the stator winding and temperature signals from the rotor winding, processed by a control terminal with a personal computer, to identify and locate dynamic turn-to-turn short circuit faults through real-time measurement and analysis, including the use of infrared temperature sensors and fast Fourier transform for spectral analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing detection methods are used for rotor dynamic turn-to-turn short circuit fault, then the detection process is simple, but the detection efficiency and reliability are insufficient
Solution Approach 1:
The detection system segments the fault detection process into multiple independent measurement channels: three-phase current signal acquisition from stator winding, temperature signal acquisition from rotor winding, spectral analysis module, and fault determination module. Each channel processes specific signals independently, improving detection reliability through multi-parameter monitoring while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The control terminal acts as an intermediary that receives and processes signals from multiple sensors (current transformers and infrared temperature sensors). It performs spectral analysis on current signals and correlates temperature variations with electrical signals to reliably determine dynamic turn-to-turn short circuit faults, bridging the gap between raw sensor data and fault diagnosis.
2Measurement precision
If rotor dynamic turn-to-turn short circuit fault is detected during shutdown, then the centrifugal force on winding decreases and turns separate, but the fault becomes difficult to detect
Solution Approach 1:
The system performs preliminary detection during generator operation when centrifugal force maintains contact between shorted turns. By monitoring temperature signals and current spectral components during the operational state, the system identifies faults before shutdown occurs, preventing the loss of detectability that would occur when centrifugal force disappears and turns separate.
Solution Approach 2:
The system continuously monitors temperature signals from the rotor winding and compares them with spectral analysis results of current signals. This feedback mechanism allows real-time detection of dynamic turn-to-turn short circuit faults during operation, providing continuous verification of fault presence while the generator is running and centrifugal forces are active.
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
This approach allows for accurate and efficient detection of rotor winding dynamic turn-to-turn short circuit faults, enabling early intervention to prevent further damage and improve power plant operations by reducing the risk of generator shutdowns.
Implementation Method 1
an infrared temperature sensor, set corresponding to rotor winding of the synchronous generator... The infrared temperature sensor measures a temperature signal of the rotor winding
Implementation Method 2
three-phase taps of stator winding of the synchronous generator pass through the current transformer respectively... The current transformer measures a three-phase current signal of the stator winding
Data Source
AI summary
A detection system and method for rotor dynamic turn-to-turn short circuit fault of synchronous generator are disclosed. The system includes a motor, a synchronous generator, a current transformer, an acquisition card, an infrared temperature sensor, a temperature acquisition instrument and a control terminal. The rotor winding dynamic turn-to-turn short circuit fault of synchronous generator is detected and located by measuring the double judgment standards of the temperature signal of rotor winding and the three-phase current signal of stator winding. The method is easy to operate and has high sensitivity. The detection and location process of the fault is efficient and reliable. The dynamic turn-to-turn short circuit fault can be detected in the early stage of the formation of rotor static turn-to-turn short circuit, so as to reduce the loss of power plant fault shutdown and better meet the needs of practical application.