Choose a listing and request its current offer
The comparison above shows the actual equipment records for this winding class. Keep existing equipment, submitted offers and future production separate. A listing's quantity is distinct from the quantity reserved for your order.
- Georgia Transformer · 180/240/300 MVA; 63/84/105 MVA tertiary · 138/34.5 kV with 12 kV buried-delta tertiary
- Georgia Transformer · 72/96/120 MVA; 25.2/33.6/42 MVA tertiary · 138/34.5 kV with 12 kV buried-delta tertiary
- Kolektor ETRA · 66/88/110 MVA; 22/29.333/36.666 MVA tertiary · 138/34.5 kV with 13.8 kV tertiary
- Manufacturer to confirm · 30/39.9/50 MVA at 55 C; 33.6/44.7/56 MVA at 65 C · 138 kV delta / 13.8 kV grounded wye
- Virginia Transformer · 25.2/33.6/42 MVA · 138/34.5 kV
- Manufacturer disclosed in the qualified technical package · 125/166/208 MVA · 138 kV HV / 34.5 kV LV
- Manufacturer disclosed in the qualified technical package · 125/166/208 MVA · 138 kV HV / 34.5 kV LV
- ABB · 39/52/65 MVA at 65°C rise · 138 kV grounded wye / 13.8 kV delta
- TSEA energia · 70/93/116 MVA · 138/34.5 kV with 13.8 kV no-load delta tertiary
Choose the exact winding ratio or project quantity
Use the required main-winding voltage pair to choose equipment. For a multi-unit project, give each ratio and delivery phase its own quantity.
Prepare a 138 kV transformer buying request
Compare the published 138/34.5 kV transformer records for generator, collector or proposed substation duty. Send the required continuous MVA, winding connections, quantity and date. A 138/13.8 kV request needs a different output winding and its own candidate review.
21 TSEA units at 138/34.5 kV
21 TSEA 138/34.5 kV transformers rated 70/93/116 MVA. These are 2027 production allocations. Possible modifications require OEM engineering approval and agreement on cost and schedule. Request the matching technical package and current allocation through Tommy.
Why does GSU versus substation duty matter at 138 kV?
The ratio alone does not establish direction, winding configuration, tertiary purpose, fault duty, voltage regulation, grounding, taps, losses, or protection behavior. Generator and collector systems impose different interfaces from a facility or utility substation.
- Confirm generator or collector bus voltage, grounded-wye/delta relationships, tertiary loading, harmonics, and switching cases.
- State the MVA base used for impedance and compare the actual test value to the system-study requirement.
- Define whether an OLTC or DETC is required, its range and step size, the controlled winding, and the expected operating mode.
How should a surplus 138 kV transformer be qualified?
Start with serial identity, nameplate, outline, final test report, condition and storage history, oil and maintenance records, included scope, current location, dimensions and weights, seller authority, inspection access, and a written status confirmation.
Public listings are represented opportunities, not reserved or guaranteed stock. Seller authority, serial identity, present condition, exact location, availability, price, included scope, and delivery require current written confirmation and remain subject to prior sale.
Request price, availability and delivery
Contact Tommy Marco at 346-276-9540 or tommy@jjtransformers.com. Include the listing ID if you have one, MVA, exact voltage ratio, quantity, acceptable condition, site and required delivery date. J&J serves U.S. projects nationwide from Sugar Land, Texas.
- Choose new or unused surplus, used, rebuilt or reconditioned equipment; condition is stated for the specific offered unit.
- Request photos, nameplate, drawings, available tests, included accessories and inspection terms.
- Confirm price, freight or delivered scope, loading, warranty, payment terms and the agreed delivery milestone in writing.
138 kV step-down transformer requirements
For a 138 kV step-down request, provide both source and output winding voltages, required continuous MVA, quantity and project date. Compare the candidate's actual operating-direction limits, winding connections, grounding, taps, impedance, insulation and installation interfaces. The voltage page remains a screening route; the step-down hub explains duty and quotation evidence.
Common questions
Written quotes and supporting records control unit-specific ratings, availability, condition, price, and delivery.
How do I request a transformer price and availability?
Email tommy@jjtransformers.com or call Tommy Marco at 346-276-9540. Send the listing reference or required MVA, exact winding voltages, quantity, destination and needed-on-site date. Ask for specifications, price, current allocation and delivery terms. Written confirmation is required; subject to prior sale.
Are every listing and production allocation ready to ship?
No. Existing equipment, submitted inventory and factory production allocations have different release schedules. TSEA allocations are for 2027 and are not immediately shipping stock. Ask for current written allocation, preparation requirements, included accessories and the delivery milestone for each offered unit.
Can the listed GSU be used as a step-down substation transformer?
The proposed operating direction and permitted continuous MVA must be checked against the actual unit documents. Winding connections, grounding, taps, protection and site interfaces need project engineering review; a matching voltage ratio alone does not establish acceptance.
Does a transformer offer include a complete substation?
Only equipment expressly included in the quotation is supplied. Specify the transformer, breakers, switchgear, protection, controls and site-work responsibilities separately when requesting a complete package.