TTE 138/34.5/13.8 kV Power Transformer – 69/92/115 MVA

Available for sale is one TTE three-phase oil-filled power transformer rated 69/92/115 MVA with voltage ratings of 138 kV / 34.5 kV / 13.8 kV at 60 Hz. The uploaded documentation identifies this unit as new and describes it as unused and stored by the manufacturer. The nameplate drawing shows ONAN / ONAF1 / ONAF2 cooling, vector group YNyn0+d, IEEE C57 standard, and mineral oil insulation fluid.  

This transformer is suited to utility-scale, industrial, and power distribution applications where immediate availability may be valuable compared with new production lead times. The technical file references factory testing including insulating level, performance, thermal, auxiliary/mechanical, insulation/material, and CT tests. The nameplate drawing also notes that the tertiary winding is for stabilizing purposes only.  

Highlights

• Manufacturer: TTE Transformers

• Type: Three-phase oil-filled power transformer

• Rating: 69 / 92 / 115 MVA

• Voltage: 138 kV / 34.5 kV / 13.8 kV

• Frequency: 60 Hz

• Cooling: ONAN / ONAF1 / ONAF2

• Vector Group: YNyn0+d

• Insulating Liquid: Mineral oil

• Standard: IEEE C57

• Condition: New

• Quantity: 1 unit

• Year of construction: 2024

• Country reference in file: USA

• Tertiary winding note: for stabilizing purposes only

Specifications

Electrical

• Rated Power: 69 / 92 / 115 MVA

• Tertiary Power Rating: 23 / 30 / 38 MVA

• HV Voltage: 138000 GrdY / 79675 V

• LV Voltage: 34500 GrdY / 19920 V

• Frequency: 60 Hz

• Vector Group: YNyn0+d

• Standard: IEEE C57

• Load Tap Changer: VACUTAP MR 72.5 kV – 18 35 3W

• Application: Industrial and power distribution

• Tertiary note: Tertiary for stabilizing purposes only

Cooling / Fluid

• Cooling Class: ONAN / ONAF1 / ONAF2

• Insulating Liquid: Mineral Oil (ASTM D-3487 Type II)

• Pressure Rating: Full vacuum

• Temperature Rise (Winding / Oil): 65 / 65 °C

Insulation / BIL

• Basic Lightning Impulse Insulation Level, Full Wave:

  • HV: 650 kV

  • HV Neutral: 200 kV

  • LV: 200 kV

Losses / Impedance

• Short-circuit impedance at 138000–34500 V and 69 MVA: shown on nameplate as field to be completed after final test; value not visible in uploaded files

Weights / Shipping

• Total Assembled Weight: 277,340 lb

• Tank and Fittings: 55,930 lb

• Core and Coils (Untanking): 147,490 lb

• Insulating Liquid (Oil): 73,920 lb

• Shipping Weight (Without Oil): 187,725 lb

• Oil in Each Radiator (50 gal): 360 lb

• Total Transformer Weight (including oil) in technical file: 127,797 kg

• Shipping Weight in technical file: 85,151 kg

• Dimensions (L x W x H): 8.469 x 4.845 x 6.819 m

Included / Packaging

Included items / accessories noted in the technical 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

• Crate number: Not shown in uploaded files

• Package dimensions: Not separately shown

• Gross / net packaged weights: Not separately shown

• Technical file states unit is stored by the manufacturer and available from February 2026

Offered subject to prior sale and final confirmation of availability. Technical details above are based only on the uploaded documentation and nameplate files. Please contact CTG Power Systems for pricing, delivery terms, documentation review, and project suitability.

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.

CTG_TTE_STUT-06-3005_Sales_Spec_Sheet.pdf