Transformer Rewind Service

Schaffner introduces its transformer rewind service, which is typically faster and more economical than purchasing a new transformer. Whether performed on-site or in-factory, Schaffner rewinds are often a desirable solution for tight budgets, tight schedules and tight spaces. In-factory refurbishment includes the installation of new coils for the existing transformer plus the associated disassembly and reassembly. 

When compared to purchasing a new coil and core, this option routinely yields savings of 30%.  If failed transformers removal requires expensive rigging, demolition or other extreme costs, then on-site rewinding may be a viable solution.  Schaffner’s experienced technicians will assess any manufacturer’s dry-type transformer to 35 kV and provide a detailed proposal prior to performing a warranted rebuild. 

When performing on-site rewinds, technicians can also provide a power quality site survey to determine whether additional actions or protections are needed to ensure that the new or rebuilt transformer will meet its intended life cycle. Harmonics are often the culprit because they cause detrimental effects such as overheating of transformers, power cables, motor and drives. Harmonics cause higher transformer voltage and insulation stress, resulting in increased heating, reduced life, and higher copper and iron losses due to hysteresis and eddy currents. Harmonics can also produce higher temperature rise in the electrical network and associated equipment, resulting in losses and shortened service life.