Company base: Sugar Land, Texas · Nationwide sales · Tommy Marco

346-276-9540 tommy@jjtransformers.com
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Power transformer buying

High-Voltage Power Transformers for Sale

J&J supplies high-voltage power transformers for generation, receiving substations, industrial facilities and data-center power systems. Review actual winding ratings and the controlling project specification. The public equipment records span multiple voltage classes, including 115, 138, 161, 230, 345 and 525 kV; a voltage-class search is the start of a technical match, not evidence that every unit serves the same application.

J&J Transformers LLC · Sugar Land, Texas · Serving projects nationwide

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Tommy Marco · tommy@jjtransformers.com

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MVA · winding voltages · duty
Condition
Unit-specific records
Availability
Written confirmation
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Tommy Marco

Current transformer listings

Compare transformer opportunities

Start with the public ratings below. Call or email Tommy for current availability, pricing, photos and the technical package. Each unit needs project-specific engineering review and remains subject to prior sale.

Royal SMITJJ-SMIT-525-3

Royal SMIT 525/69 kV Transformers — 3 Available

Rating
240/320/400 MVA; 250 MVA maximum step-down; 90 MVA tertiary
Voltage
525/69 kV with 13.7 kV buried-delta tertiary
Quantity
3 units
Condition
2022 manufacture shown in supplied nameplate; condition and service history confirmed with quotation
Equipment location
International; dispatch location confirmed with quotation
Evidence
Supplied nameplate, outline drawing and factory acceptance test report

Technical records reviewed

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Kolektor ETRAJJ-138-110-5

Five 110 MVA 138/34.5 kV Kolektor ETRA GSUs

Rating
66/88/110 MVA; 22/29.333/36.666 MVA tertiary
Voltage
138/34.5 kV with 13.8 kV tertiary
Quantity
5 units; matching unit packages available on request
Condition
Brand new, never used and never energized; 2020 factory records reviewed for one unit
Equipment location
International; dispatch location confirmed with quotation
Evidence
Five-unit opportunity confirmed by seller; rating plate and FAT package reviewed for one unit

Technical records reviewed

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Manufacturer to confirmJJ-TX-007

50 MVA-Class 138/13.8 kV Substation Package

Rating
30/39.9/50 MVA at 55 C; 33.6/44.7/56 MVA at 65 C
Voltage
138 kV delta / 13.8 kV grounded wye
Quantity
1 represented design package
Condition
Brand new, never used and never energized; 2024 approval drawings reviewed; serial identity requires confirmation
Equipment location
USA
Evidence
Project-specific supplied approval drawings reviewed; final equipment OEM and serial identity require confirmation

Technical records reviewed

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ABBJJ-ABB-230-13-3

3 Rebuilt ABB 59.7 MVA-Class 230/13.8 kV Transformers

Rating
40/53.3 MVA at 55 C; 44.8/59.7 MVA at 65 C
Voltage
230 kV delta / 13.8 kV grounded wye
Quantity
3 represented units
Condition
Rebuilt; three ABB 230/13.8 kV transformers. Rebuild scope and included accessories are confirmed with the quotation
Equipment location
USA
Evidence
Seller specification sheet and equipment photo reviewed

Technical records reviewed

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ABB Ltda.JJ-ABB-AUTO-112

112 MVA-Class ABB 230/115/69 kV Autotransformer

Rating
60/80/100 MVA at 55 C; 67.2/89.6/112 MVA at 65 C
Voltage
230 kV to reconnectable 115 or 69 kV with 13.5 kV delta tertiary
Quantity
1 nameplate-documented opportunity; available quantity to confirm
Condition
Brand new, never used and never energized
Equipment location
USA
Evidence
Serial-specific nameplate photograph reviewed

Technical records reviewed

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WestinghouseJJ-WEST-GE-66-2

Westinghouse / GE 66 MVA Rebuilt Transformer Offers

Rating
39.6/52.8/66 MVA represented; 66 MVA in one supplied report
Voltage
140.9 kV Delta / 34.5 kV Wye in one report; offered as nominal 138/34.5 kV
Quantity
2 represented units; report reviewed for 1
Condition
Pre-owned / rebuilt; recorded valve leaks and broken gauge require present repair verification
Equipment location
USA
Evidence
Written offer identifies Westinghouse manufacture and a GE Energy rebuild; supplied maintenance report covers one unit

Technical records reviewed

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ILJIN ElectricJJ-ILJIN-230-167

ILJIN 167 MVA 230/34.5 kV New / Unused Transformer

Rating
100/133/167 MVA
Voltage
230/34.5 kV; tertiary voltage to confirm
Quantity
1 represented unit
Condition
New / unused and never energized, as explicitly represented in the offer
Equipment location
International; dispatch location confirmed with quotation
Evidence
Individual written offer, repeated in a September 30 equipment listing

Technical records reviewed

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Manufacturer disclosed in the qualified technical packageJJ-TX-201

208 MVA 138/34.5 kV Stored Surplus Transformer

Rating
125/166/208 MVA
Voltage
138 kV HV / 34.5 kV LV
Quantity
1 offered position
Condition
Surplus in storage; service history requires confirmation
Equipment location
Dispatch location confirmed with quotation
Evidence
Supplied design data sheet; final unit-specific nameplate and FAT pending

Technical records reviewed

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Manufacturer disclosed in the qualified technical packageJJ-TX-204

345/34.5 kV Transformer Production Positions

Rating
266 MVA offered; final rating requires reconciliation
Voltage
345 kV HV / 34.5 kV LV
Quantity
2 offered positions
Condition
Factory manufacturing position; completion pending
Equipment location
Dispatch location confirmed with quotation
Evidence
Seller offer summary; exact cooling stages require confirmation

Technical records reviewed

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Manufacturer disclosed in the qualified technical packageJJ-TX-205

116 MVA 138 kV Transformer Positions — 2027

Rating
116 MVA stated maximum
Voltage
138 kV HV; secondary voltage requires confirmation
Quantity
2 offered positions
Condition
Factory manufacturing position; completion pending
Equipment location
Dispatch location confirmed with quotation
Evidence
Seller offer summary; exact cooling stages require confirmation

Technical records reviewed

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ABB Power T&DJJ-TX-208

ABB 133 MVA 115/13.2 kV Pre-Owned GSU

Rating
80/106.67/133.33 MVA at 55C rise; 89.6/119.47/149.33 MVA at 65C rise
Voltage
115 kV grounded wye / 13.2 kV delta
Quantity
One offered unit; subject to prior sale and written allocation
Condition
Pre-owned installed surplus; detailed service history requires confirmation
Equipment location
Location confirmed with quotation
Evidence
OEM nameplate and supplied technical packet

Technical records reviewed

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Manufacturer requires confirmationJJ-TX-209

65 MVA 138/13.8 kV Reconditioned GSU

Rating
39/52/65 MVA
Voltage
138 kV grounded wye / 13.8 kV delta
Quantity
One unit; current allocation subject to written confirmation
Condition
Reconditioned used transformer; refurbishment completed in 2022
Equipment location
Location confirmed with quotation
Evidence
Nameplate drawing and refurbishment/testing report

Technical records reviewed

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Review All Current Transformers
Jump to a section

Browse high-voltage transformer classes and ratios

Choose the required high-side class, then confirm the actual low-side and any tertiary winding. Each linked page describes its own equipment and application checks.

Rated voltage and BIL answer different questions

The winding voltage identifies the operating rating. Basic impulse insulation level, or BIL, is part of the insulation specification. Request insulation values for the relevant windings, terminals and neutral and compare them with the project's required levels. A matching nominal kV value alone does not establish insulation compatibility.

Winding connection, grounding and tertiary duty

Confirm delta or wye connections, neutral access, phase displacement, tertiary voltage and usable tertiary MVA. A 13.8 kV tertiary on an autotransformer is not automatically a 13.8 kV main-load supply. The project engineer must approve the intended winding duty and grounding arrangement.

Review taps, impedance and the protection interface

Compare OLTC and de-energized tap equipment, tap range and steps, impedance and its stated MVA base, frequency, terminal arrangements and protection requirements. Include breaker voltage and fault duty in the system review; transformer and breaker procurement should use the same project basis.

Common questions

Written quotes and supporting records control unit-specific ratings, availability, condition, price, and delivery.

Where can I buy high-voltage transformers?

J&J Transformers LLC supplies high-voltage power transformer opportunities with unit-specific records. Compare the public voltage and MVA ratings, then contact Tommy for the technical package, price and current availability.

Will any 230 kV transformer fit a 230 kV project?

No. Low-side voltage, winding connections, MVA duty, insulation levels, taps, grounding, impedance, protection and physical interfaces also need to match.

Can a 525 kV unit serve a 500 kV system?

The Royal SMIT record states a 525 kV winding rating. The project engineer must review the system voltage, taps, insulation, protection and required operating duty before accepting it for a 500 kV project.

Related equipment and guides

Browse the related equipment and guides, or email Tommy to discuss your project.

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