ABB / HitachiJJ-230-220-1
220 MVA 230/34.5 kV ABB/Hitachi Transformer
- Rating
- 220 MVA
- Voltage
- 230/34.5 kV
- Quantity
- 1 unit
- Evidence
- Manufacturer and ratings supplied by J&J Transformers LLC
Listing reviewed
Request Specs, Price & AvailabilityTransformer types and project fit
Power Transformers for Sale and Project Sourcing
J&J Transformers LLC is a power transformer supplier serving utilities, data centers, EPCs and industrial projects nationwide. Browse GSU, substation, step-down and pad-mounted transformers by voltage and capacity. Need another configuration? Send Tommy Marco your kVA or MVA, voltages, quantity and required date. Each offered unit requires engineering review and written availability confirmation; subject to prior sale.
J&J Transformers LLC · Sugar Land, Texas · Serving projects nationwide
Tommy Marco · tommy@jjtransformers.com
- Product classes
- GSU · substation · pad-mounted
- Voltage classes
- 69 · 115 · 138 · 161 · 230 · 345 kV
- Availability
- Written reconfirmation required
- Review basis
- One-line + unit documents
Current transformer listings
Transformers available for review
Each listing shows its public ratings and the records reviewed. Ask for photos or a technical package after project qualification. Availability must be reconfirmed in writing and remains subject to prior sale.
Georgia TransformerJJ-GA447A
180 MVA 345/34.5 kV Georgia Transformer
- Rating
- 108/144/180 MVA; 37.8/50.4/63 MVA tertiary
- Voltage
- 345/34.5 kV with 12 kV buried-delta tertiary
- Quantity
- 1 documented unit - GA447A
- Evidence
- Serial-specific approval drawings and FAT report reviewed
Listing reviewed
Request Specs, Price & AvailabilityKolektor 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
- Evidence
- Five-unit opportunity confirmed by seller; rating plate and FAT package reviewed for one unit
Listing reviewed
Request Specs, Price & AvailabilityFortune ElectricJJ-FORTUNE-230-167
167 MVA 230/34.5 kV Fortune Electric Transformer
- Rating
- 100/133/167 MVA; 35 MVA tertiary
- Voltage
- 230/34.5 kV with 13.3 kV buried-delta tertiary
- Quantity
- 1 unit
- Evidence
- Nameplate drawing reviewed
Listing reviewed
Request Specs, Price & AvailabilityJump to a section
Choose the right transformer for the job
Start with the electrical duty and construction—not just a product name. A GSU connects generator output to a higher-voltage bus; a substation transformer connects system voltage levels; and a pad-mounted transformer serves cable-connected distribution loads.
| Transformer class | Primary duty | Decision inputs | Next page |
|---|---|---|---|
| Generator step-up (GSU) | Raises generator terminal voltage to a plant or interconnection bus | Generator MVA, voltage, PF/reactive range, high-side voltage, impedance, BIL, GCB arrangement | GSU transformer page |
| Substation / power | Changes voltage between transmission, subtransmission, or campus distribution levels | MVA, HV/LV/tertiary, LTC/DETC, BIL, impedance, losses, cooling, fault duty | Substation transformer page |
| Pad-mounted | Outdoor compartmental distribution close to a load block | kVA, primary/secondary, loop/radial, dead/live front, fusing, switch, fluid, enclosure | Pad-mounted transformer page |
| Dry-type | Indoor or outdoor distribution where the chosen insulation system and enclosure fit the site | kVA/MVA, voltage, BIL, enclosure, ventilation, temperature rise, sound, harmonics, AHJ requirements | Transformer comparison guide |
What we need to quote a transformer
Start with capacity, phase, frequency, high- and low-side voltages, duty, site, and needed-on-site date. To confirm a technical match, we may also need BIL, impedance, cooling, vector group, neutral and taps, fluid, losses, harmonics, site conditions, sound limits, and shipping constraints.
- Capacity: base kVA/MVA and every cooling-stage rating; do not substitute MW for MVA.
- Voltage: nominal and maximum-system values for each winding, plus generator terminal voltage where applicable.
- Insulation and system: BIL, grounding, vector or winding connection, phase displacement, impedance and its MVA/tap/temperature basis.
- Regulation: LTC or DETC range, steps, control requirements, and parallel-operation constraints.
- Site: minimum/maximum ambient, altitude, seismic, wind, sound, footprint, terminals, access, route, and installation state.
- Evidence: one-line, nameplate, outline, schematic, test report, losses, oil/fluid data, maintenance and preservation records when available.
Voltage classes we can source
We screen requirements in the 69, 115, 138, 161, 230, and 345 kV classes when a source and supporting records are available. Ratios such as 230/34.5, 138/34.5, 230/13.8, 345/34.5, and 230/69 kV are common searches, but the ratio alone never establishes a technical fit.
| HV class | Example search ratios | Project team must confirm |
|---|---|---|
| 69 / 115 kV | 69/13.8 · 115/34.5 | MVA, maximum system voltage, BIL, impedance, vector, taps, duty, site |
| 138 / 161 kV | 138/34.5 · 138/13.8 · project-specific 161 kV ratios | Generator or substation duty, tertiary, grounding, cooling, losses, documents |
| 230 kV | 230/34.5 · 230/13.8 · 230/69 | Complete winding schedule, BIL, impedance basis, OLTC/DETC, terminals, logistics |
| 345 kV | 345/34.5 and project-specific ratios | Collector/grid duty, tertiary, switching cases, transport, tests, project approval |
Examples describe project search patterns, not guaranteed inventory. Review current opportunities or send an equipment request for a written match.
Common questions
Written quotes and supporting records control unit-specific ratings, availability, condition, price, and delivery.
Which transformer type should I request?
Choose by duty: GSU for generator export, substation/power transformer for network or campus voltage transformation, and pad-mounted for compartmental medium-voltage distribution near loads.
What ratings are required for a transformer quote?
Start with kVA/MVA, high and low voltage, phase, frequency, duty, site, and date; provide BIL, impedance, cooling, vector group, taps, site conditions, and documents when known.
Why are BIL and impedance important?
BIL supports insulation coordination. Impedance affects fault current, regulation, reactive behavior, protection, and parallel operation. Both must match the system studies and purchaser specification.
Can an existing transformer be matched?
Yes, after its nameplate, one-line, outline, schematics, test data, site conditions, and interface requirements are compared to candidate units.
Can J&J source a 125 MVA transformer?
Yes, J&J can screen a 125 MVA requirement when the project team supplies the complete duty, cooling-stage ratings, high- and low-side voltages, frequency, BIL, impedance basis, vector and grounding, OLTC or DETC requirement, site, condition acceptance, documents, quantity, and project timing. This is a sourcing capability, not a claim that a matching 125 MVA unit is currently available.
Are used transformers acceptable for data centers?
That is an owner and engineering decision based on condition, evidence, tests, remaining-life assessment, warranty, reliability architecture, and project requirements.