How does the hv tester help in detecting winding deformation in transformers?

 The HV (high voltage) tester helps in detecting winding deformation in transformers by utilizing the principle of capacitance measurement. 


Capacitance measurement:

The HV tester applies a high-voltage signal to the transformer winding under test.

As the voltage is applied, the tester measures the capacitance between the winding and the transformer's core or tank.

The measured capacitance is directly related to the physical geometry and positioning of the transformer windings.

Winding deformation detection:

Any deformation or displacement of the transformer windings will result in a change in the measured capacitance.

The HV tester can detect even small changes in the capacitance, which can indicate winding deformation, such as:

Winding displacement

Winding compression or expansion

Partial winding short-circuits

Winding axial or radial movement

Signature comparison:

The HV tester establishes a baseline capacitance signature for the transformer winding when it is in a healthy condition.

This baseline signature is used as a reference for future comparisons.

Any significant deviation from the baseline signature can indicate the presence of winding deformation or other internal issues within the transformer.

Localization of issues:

The HV tester can perform measurements on individual windings or phases of the transformer.

By analyzing the capacitance changes in different windings or phases, the tester can help localize the specific area where the winding deformation has occurred.

Trend analysis:

By conducting regular HV tester measurements over time, the transformer's winding condition can be monitored.

Trends in capacitance changes can help predict the progression of winding deformation and guide maintenance and replacement decisions.

The HV tester's ability to detect subtle changes in winding capacitance makes it a valuable tool for identifying winding deformation issues in transformers, enabling proactive maintenance and enhancing the overall reliability and performance of the power system.



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