Transformer Tank
The sealed steel enclosure containing the transformer core-coil assembly and insulating oil, providing mechanical protection and structural support.
The transformer tank houses the core-coil assembly and insulating oil in oil-immersed transformers. Must withstand: internal oil pressure, weight of core/coil assembly (up to 200+ tonnes), seismic forces, wind loads, and short-circuit pressures.
Construction: carbon steel (normal), stainless steel (corrosive environments). Features: bushing openings, manholes, drain valves, marshalling mounts, radiator banks, conservator supports, lifting lugs.
Advanced designs: corrugated wall (distribution—eliminates separate radiators, sealed-for-life), finned tube radiators, forced cooling fans/pumps.
QDTB designs tanks using FEA for optimal strength-to-weight ratio. Sealed corrugated tanks for distribution transformers provide 25+ year maintenance-free service. See selection guide for tank type selection.
Related Terms
Oil-Immersed Transformer
A transformer using mineral oil as insulation and cooling medium, most common for outdoor power and distribution.
Bushing
An insulated device allowing a conductor to pass through a grounded barrier while maintaining insulation integrity.
Cooling Class (ONAN/ONAF/ODAF)
Standardized codes describing transformer cooling methods: O=Oil, N=Natural, A=Air, F=Forced, D=Directed flow.
Fault Current
The extremely high current during a short circuit that transformers must withstand mechanically.
More Terms Starting with “T”
Transformer
A static device transferring energy between circuits through electromagnetic induction, changing voltage and current levels.
Tap Changer
A device adjusting transformer turns ratio by connecting to different tap points on a winding.
Temperature Rise
The temperature increase of transformer components above ambient at rated load, a key design parameter.
Three-Phase Transformer
A transformer for three-phase power systems with three winding sets on a common core.
More in “Components & Accessories”
Bushing
An insulated device allowing a conductor to pass through a grounded barrier while maintaining insulation integrity.
Busbar
A metallic strip conducting electricity within switchgear, transformers, and distribution equipment.
HV/LV Bushing
High-voltage and low-voltage insulated conduits for transformer winding connections through the grounded tank.
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