Transformer winding deformation analyzer | Test precautions?

Transformer Winding Deformation Analyzer/Frequency Response Tester - Test Precautions and Features?

The test precautions and core features of the frequency response tester are as follows:

I. Test Precautions

1. Acquisition and Preservation of Reference Spectrum: The most critical step is to acquire and permanently preserve a clear "fingerprint"-like reference frequency response spectrum when the transformer is in good condition at the factory or during initial commissioning. All subsequent diagnostics must be compared with the reference spectrum.

2. Reliable Wiring and Grounding: Before testing, ensure the transformer bushing leads are secure and reliably grounded. The joints of the test leads (especially the signal injection lines and response measurement lines) must have good and stable contact to prevent loosening and noise introduction.

3. Consistency of Test Conditions: The wiring method (end-to-end), grounding status, lead positions, and even the transformer tap positions must be completely consistent with those used when acquiring the reference spectrum for each test. Any slight difference will lead to spectrum changes and interfere with judgment.

4. Environmental Interference Control: Testing should be conducted under relatively stable electromagnetic conditions. Ensure the test instrument is well grounded and the connecting cables are reliable to reduce the impact of background interference on the high-frequency curves.

II. Core Features

1. Sensitive Diagnosis of Winding Mechanical Deformation: This technology is extremely sensitive to mechanical faults such as axial displacement, radial deformation, and inter-turn short circuits in the windings, effectively detecting early-stage hidden damage that traditional electrical tests cannot detect.

2. Non-destructive Testing and Spectrum Comparison: The applied voltage during testing is extremely low, causing no damage to the insulation, thus constituting a condition assessment. Its diagnosis does not rely on a single parameter but is based on a full-band comparative analysis of the response curve morphology across the entire frequency sweep range (typically 1kHz-1MHz).

3. Intelligent Analysis and Quantitative Judgment: Modern instruments have built-in analysis software that can quantitatively calculate curve differences using algorithms such as correlation coefficients, assisting in judging the degree of deformation. It also provides database functionality for convenient historical data management and trend analysis.

Summary: The frequency response method is currently an effective means of diagnosing winding deformation in power transformers. Its value lies in its ability to sensitively reveal changes in the mechanical state of the windings through high-precision frequency response curve comparison. The core of its operation lies in rigorously maintaining consistent test conditions and relying on high-quality historical benchmark spectra. The MSBR-II frequency response tester, developed based on response analysis methods, is a novel non-destructive testing device for internal transformer faults.

It is suitable for detecting internal structural faults in 63kV to 500kV power transformers.

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