Don't Let "loosening" Ruin It: Support Components Of Dry-type Transformers

Often, people focus more on whether the coils are burnt out, easily overlooking the foundation beneath their feet while staring at the instrument panel. This aging of the fixed structure in dry-type transformers is all too common, especially in older substations that have been in operation for over ten years. It's like worn-out joints in a person; they may look fine on the surface, but internally they're nearing their breaking point.

Several "Hidden Pitfalls" of Structural Aging

If you notice a sudden increase in equipment noise during routine inspections, it's most likely due to the following components:

• Gap Blocks and Insulation Supports: Prolonged exposure to high temperatures and pressure causes these composite materials to become brittle and shrink. Once gaps appear in the previously taut structure, the coils begin to vibrate under electromagnetic forces, and these tiny vibrations are the culprit for insulation damage.

• Fastening Bolts and Clamps: While metal parts are durable, gaskets at connections can oxidize. This aging leads to decreased clamping force, resulting in the humming sound during operation.

• Epoxy Resin Castings: Micro-cracks on the surface are not only unsightly but also provide rapid channels for moisture to penetrate.

The degradation of these mechanical connections is essentially a general decline in physical performance. Once the mounting bracket can no longer support the several-ton iron core and windings, not only will losses inexplicably increase, but it may even completely collapse under an external short-circuit impact.

A Guide to Avoiding Pitfalls After Identifying Early Signs

If you encounter a dry transformer problem where the fixed structure is aging, don't think that simply tightening the bolts with a wrench will solve the problem. If the spacers have already carbonized and shrunk, simply applying force may directly crack the already fragile insulation layer.

At this point, you need to examine the depth and distribution of the cracks. If it's just surface aging, a power outage cleaning and professional insulation varnish reinforcement can extend its lifespan for a few more years. If you find that the support components are deformed or severely discolored, you need to consider replacing some hardware or a complete overhaul. Regularly scan these connection points with an infrared imager; any point with abnormally high temperatures is likely due to poor contact caused by aging or vibration overload.

When maintaining this dry type transformer manufacturers core, pay close attention to these inconspicuous skeleton structures. Dealing with anomalies early is much cheaper and less stressful than trying to find a solution when things get really bad.