What 138 kV transformer opportunities are published?
Current pages include a Georgia Transformer GA283A 180/240/300 MVA unit, a Georgia Transformer GA424A 72/96/120 MVA solar GSU, five represented Kolektor ETRA 66/88/110 MVA GSUs, and an IEN Hanchang 30–56 MVA substation design.
The evidence is not identical across these opportunities. GA283A has a serial-specific nameplate; GA424A has a nameplate and approval drawings; the Kolektor group has a rating plate and FAT package for serial 84097 while the remaining serial packages must be obtained; JL3023 is based on project approval drawings with final identity and test fields still open.
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 opportunities for technical screening, not guaranteed stock. Seller authority, serial identity, current condition, location, availability, price, included scope, and delivery require current written confirmation.
Frequently asked questions
These answers explain the procurement and application questions buyers ask most often. Unit-specific ratings, availability, conformity, condition, price, and delivery are controlled by the written quotation and supporting documents.
Does J&J publish 138/34.5 kV GSU transformers?
Yes. Multiple public pages describe 138/34.5 kV opportunities, including documented and multi-unit represented equipment.
Is 138/13.8 kV also represented?
Yes. The JL3023 page describes a project-specific 138/13.8 kV substation design with several identity and test fields still requiring confirmation.
What is the largest published 138 kV MVA class?
The GA283A nameplate shows 180/240/300 MVA stages. Availability, condition, scope, and suitability still require confirmation.