How Is a Transformer Tanked and Assembled?
Quick answer — After the core and windings are dried, they are lowered into the tank, the bushings, tap-changer, conservator, valves and fittings are fitted, and the tank is evacuated and filled with degassed dry oil. The assembly must be clean, leak-tight and free of moisture so the insulated active part is protected and the unit is oil-filled and ready for testing.
How is a transformer tanked and assembled?
Lowering the active part
The dried core-and-windings (active part) is carefully lowered into the cleaned tank, with the leads and connections aligned.
Fitting the components
The bushings, on-load tap changer, conservator, breather, valves, gauges and cooling are installed, and the tank is sealed leak-tight.
Filling with oil
The tank is evacuated and filled with degassed, dry oil under vacuum to remove air and moisture, then the unit is topped up and checked for leaks and level.
References & standards
- IEC 60076-1
- IEEE C57.12.00
Related
Related manufacturers
Prolec GE (GE Vernova) · Prolec GE Waukesha · Hitachi Energy USA · Siemens Energy · Eaton · Virginia Transformer Corp
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Technical content is prepared from engineering references, standards frameworks, manufacturer documentation and industry sources. Contractual or compliance decisions should refer to current official standards. TransformerPath Technical Editorial.
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