Toshiba 138/34.5 kV Step-Up Power Transformer – 90/112/140 MVA

Available for sale is one Toshiba three-phase oil-immersed step-up power transformer rated 90/112/140 MVA at 138 kV / 34.5 kV, manufactured in 2025. This unit is identified by serial number A23009 and is described in the provided documentation as new and unused.

Designed for utility-scale and industrial power applications, this transformer features ONAN/ONAF1/ONAF2 cooling and 60 Hz operation. The uploaded technical file also references a tertiary winding at 13.88 kV and notes factory testing by the manufacturer.

This unit may be suitable for power generation, industrial power distribution, and grid support projects where immediate availability can be an advantage versus new production lead times. Reference standards listed in the documentation include ANSI/IEEE, ANSI C2, ASTM, NEMA, and ASME.

Highlights

• Manufacturer: Toshiba

• Type: Three-phase oil-immersed step-up power transformer

• Rating: 90/112/140 MVA

• Voltage: 138 kV HV / 34.5 kV LV

• Frequency: 60 Hz

• Cooling: ONAN / ONAF1 / ONAF2

• Serial Number: A23009

• Year of Construction: 2025

• Condition: New

• Quantity: 1 unit

• Country of manufacture/location reference in file: USA

• Factory test program referenced in documentation

Specifications

Electrical

• Rated Power: 90/112/140 MVA

• Phase: Three-phase

• HV Voltage: 138 kV

• LV Voltage: 34.5 kV

• Tertiary Voltage: 13.88 kV

• Frequency: 60 Hz

• Application: Step-up power transformer

• Serial Number: A23009

• Year Built: 2025

Cooling / Fluid

• Cooling Class: ONAN / ONAF1 / ONAF2

• Dielectric Fluid: Oil-immersed

Insulation / Test Information

• Insulating level tests referenced

• Applied voltage and induced voltage withstand tests referenced

• Partial discharge measurement referenced in technical description

• Performance, thermal, insulation/material, and CT tests listed in technical file

Weights / Dimensions

• Total Transformer Weight (including oil): 141,190 kg

• Shipping Weight: 70,700 kg

• Overall Dimensions (L x W x H): 7.72 x 6.045 x 7.26 m

Included / Packaging

Included items / accessories noted in the file

• Winding hot spot temperature detector (RTD)

• Winding hot spot temperature indicator relay

• Complete set of gaskets

• One gallon of touch-up paint

• One high-voltage line bushing

• One low-voltage line bushing

• One neutral bushing (each type)

• One sudden pressure relay

• One lot breather desiccant

Field services referenced

• Offload

• Assembly and oil filling

• Field inspections and testing

Packaging / shipping

• Shipping weight listed: 70,700 kg

CTG_Toshiba_STUT-06-3004_Sales_Spec_Sheet.pdf

_{Depictions shown herein are representative only and may not reflect the exact final product. Actual equipment will conform to approved engineering documentation and project specifications.}