Stator Partial Discharge Detection During Dielectric and Surge Tests
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Solution Overview
Problem
Existing electric machine testing methods fail to efficiently identify partial discharge and dielectric strength issues concurrently, leading to prolonged testing times and potential undetected defects in stator windings.
Innovation Solution
A system that integrates an AC signal generator, current sensor, filter, and controller to perform simultaneous dielectric strength and partial discharge testing using sinusoidal signals, and an impulse signal generator, A/D converter, and filter to perform surge and partial discharge testing, allowing for concurrent evaluation of stator winding defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate testing procedures are used for dielectric strength and partial discharge testing, then each test can be performed with dedicated equipment, but the total testing time is prolonged and manufacturing efficiency is reduced
Solution Approach 1:
The patent combines dielectric strength testing and partial discharge testing into a single integrated system that performs both tests simultaneously on the stator winding. The testing apparatus includes a high-voltage power supply, signal injection unit, and detection units that operate concurrently to evaluate both dielectric strength and partial discharge characteristics, thereby reducing total testing time while maintaining detection accuracy for both defect types
Solution Approach 2:
The integrated testing system is designed to perform multiple testing functions through a unified apparatus. The system can selectively perform dielectric strength testing, partial discharge testing, or both simultaneously by configuring the signal injection and detection pathways, making the equipment versatile and eliminating the need for separate dedicated testing devices
2Productivity
If concurrent dielectric strength and partial discharge testing is performed, then testing time is reduced, but the device complexity increases due to integration of multiple testing functions
Solution Approach 1:
The integrated testing system is divided into distinct functional modules: a high-voltage power supply unit, a signal injection unit for introducing test signals, a detection unit for measuring responses, and a control unit for coordinating operations. Each module performs a specific function and can be independently configured, which manages overall system complexity while enabling concurrent testing operations
Solution Approach 2:
The patent introduces a signal injection unit as an intermediary component that facilitates concurrent testing by injecting specific test signals into the stator winding during dielectric strength testing. This intermediary enables the detection unit to simultaneously measure both dielectric strength characteristics and partial discharge signals without requiring separate testing apparatus
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
The system reduces testing time by concurrently evaluating partial discharge and dielectric strength, providing comprehensive defect identification in stator windings, thereby enhancing manufacturing efficiency and reliability.
Implementation Method 1
a filter and an antenna. The switching system is configured to connect the AC signal generator to the stator of the electric machine and the filter during partial discharge testing
Data Source
AI summary
A testing system includes an AC signal generator configured to selectively generate a sinusoidal signal including a plurality of cycles. A dielectric strength and partial discharge tester sequentially performs dielectric strength and partial discharge testing of a stator of an electric machine using the sinusoidal signal. Another testing system includes an impulse signal generator configured to selectively generate an impulse signal including a plurality of cycles. A surge and partial discharge tester for sequentially performing surge and partial discharge testing of a stator of an electric machine using the impulse signal.