Rewinding transformers is a complex and labor-intensive type of technological operation when repairing this type of electrical equipment. All types of transformers produced by industry are highly reliable. These static electromagnetic devices have no moving parts and are designed for a long period of operation. The most common reasons for refusals may be, in particular:
- factory defects (components, assembly)
- critical deviation of operating conditions
- violation of prescribed operating rules
- installation errors
- natural aging of insulating materials.
As a rule, in such cases there is a break in the transformer winding with its complete failure. Another manifestation of a failure is an interturn short circuit on the housing, during which the power drops, and significant heating of the windings occurs. In the listed cases, the transformer requires a major overhaul with complete (partial) disassembly of the active part.
When a transformer fails, in most cases it is overhauled rather than replaced. This is due to economic reasons. Thus, restoring functionality by rewinding the transformer coil costs about 30% less than purchasing a new device. On the technical side, repair of a power transformer has a positive aspect: it is possible to modernize the transformer by changing (improving) its consumer properties and technical parameters. The restored transformer can still serve for a long period.
Transformer rewinding service in Tashkent
The transformer rewinding service in Tashkent provided by our company can be used to repair, modernize, or change the technical parameters of various types of this electrical equipment. Rewinding refers to the following types of work: disassembling the transformer, troubleshooting it, actually rewinding the transformer coils, applying insulation (impregnation with varnish), general assembly, bench testing.
Pulse transformer rewinding technology is different from other types. In order to reduce interference and losses, its design uses a complex sectional winding. Rewinding only the primary or secondary winding of a pulse transformer is impossible; both must be rewinded at once. When rewinding such devices, the sequence of operations must be strictly followed; the slightest deviations can significantly change its characteristics and even lead to failure.
When there is a need to manufacture a device with non-standard voltage and current parameters, a careful calculation and rewinding of a transformer of a suitable (unified) type is made. In this case, the existing structural elements (winding frame, core) are taken as a basis and the old winding is replaced with a new one. For example, this way you can rewind a TS 180 transformer (secondary winding), which is equivalent to manufacturing a new one with the specified characteristics.
In the process of rewinding a transformer, it becomes possible to improve its technical and operational parameters. Using the method of dividing the windings into sections instead of additional insulation improves heat removal, and therefore helps to increase the rated power of the transformer. Air cooling of the winding will be more effective the more separate sections there are. The use of effective winding methods can, by reducing the cross-section of wires, reduce the size of the windings (coils), their weight and the total cost of the device.