16
2022
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06
A brief introduction: What are the causes of transformer winding deformation?
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Industry News
【Summary Description】Power transformer equipment is a crucial component in the power industry, and its health and safety are significant concerns. Among these, transformer winding deformation is a relatively common yet very complex issue.
Power transformer equipment is a crucial component in the power industry, and its health and safety are significant issues. Among them, transformer winding deformation is a relatively common yet very complex problem.
So, what causes transformer winding deformation?
1. Causes of transformer winding deformation
According to the international power grid conference CIGRE guideline 342 and the power industry standard DL/T911 "Frequency Response Analysis Method for Transformer Winding Deformation", winding deformation refers to the axial or radial dimensional changes of the power transformer winding under mechanical or electromagnetic forces, typically manifested as local twisting, bulging, or displacement of the winding. Therefore, the main cause of winding deformation is due to electromagnetic or mechanical forces.
2. Sources of electromagnetic/mechanical forces causing winding deformation
What exactly causes these destructive electromagnetic or mechanical forces?
According to relevant research and experience summaries, the main sources include the following categories. Among them, the last item, short-circuit current impact and insufficient short-circuit withstand capability of the winding, is the most significant, common, and direct cause.
(1) Structural design issues or production process issues
(2) Over-excitation, leakage magnetic issues, or abnormal core vibrations
(3) Impacts, bumps, or vibrations during transportation
(4) Collisions during installation or major repairs
(5) Short-circuit current impact and insufficient short-circuit withstand capability of the winding (the main cause)
3. Winding failure issues are a major problem
Overall, the proportion of transformer winding failures is relatively high in various statistics, among which short-circuit impact currents (electromagnetic forces) can lead to winding deformation, becoming the main cause of winding deformation issues.
Specifically as follows:
Statistical Data 1 - CIGRE reports that among 800 transformer failures worldwide, winding issues account for about 20%.
Statistical Data 2 - In the 10-year transformer failure statistics from the Chinese Energy Bureau, an average of about 10% are transformer winding failures.
Statistical Data 3 - In a certain region, from 1990 to 1997, approximately 145 incidents of damage directly caused by short-circuit fault current impacts occurred in 110KV and above, accounting for 31% of the total incidents during the same period.
Although it is impossible to quantify the more detailed proportion of winding failure issues that ultimately lead to winding deformation, the above statistics are sufficient to indicate that winding issues are very common. It is believed that winding deformation issues are similarly prevalent and deserve in-depth research on relevant control measures.
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