Shell-type (acorazado) transformer repair

In a shell-type (acorazado) transformer the magnetic core surrounds the windings, rather than the windings surrounding the core as in column-type units. That geometry gives excellent mechanical strength against short-circuit forces — which is why it is common in large, heavily-stressed transformers — but it also makes the active part far more demanding to access and repair. Disassembling, rewinding and reassembling a shell-type unit correctly requires specific experience that most service shops simply do not have.

TEVKO repairs shell-type transformers up to 230 MVA across the full scope: total or partial rewinding of high- and low-voltage windings with conductor and insulation to the design specification, magnetic core repair, insulation restoration, and repair of the tap changer. As an independent, multi-brand service provider, TEVKO works on shell-type units of any manufacturer — the repair is driven by the asset's condition and design, not by an OEM tie.

Every shell-type repair is executed under the applicable standards (IEEE C57, IEC 60076) and validated with the full electrical test protocol — turns ratio, winding resistance, power factor, SFRA — with Omicron and Megger instrumentation, in TEVKO's 5,600 m² plant equipped with 60-ton cranes, drying ovens and a test bench. TEVKO does not manufacture transformers: it returns your shell-type unit to the performance the manufacturer specified, with real electrical data and a documented protocol.