Switchyard Supply
Representative 345 kV class generator step-up transformer on a pad with a generation plant behind
Representative class photos. Serial-unit records are captured on the order evidence pack.

GSU

Thermal / campus GSU capability class . ~990 MVA · 345/24 kV

990 MVA · 345 / 24 kV · 60 Hz

About this listing

  • 990 MVA, 345 / 24 kV, ONAF cooling.
  • Ship-to US. Rail / heavy-permit. FAT and verified receive available on the quotation.
  • Working-capital interest can be flagged on the quotation. Partner-indicated, subject to underwriting. No live APR.
  • Compliance targets: IEEE C57, IEC, BABA interest, Interconnect ready, ISO 9001, UL.

Specifications

Catalog No.SY-GSU-990-345-24-REF
MVA990 MVAVerify at quotationCooling stage sets the usable rating.
Primary / secondary345 / 24 kV
Frequency60 Hz
CoolingONAFVerify at quotationONAN/ODAF per OEM.
Vector groupOEM to proposeVerify at quotationYNd / Dyn common.
OLTCYesVerify at quotationTap range.
BIL1050 kV classVerify at quotationInferred from primary kV per IEEE/IEC.
%ZIndicative template - high-MVA thermal GSU %Z often 10-14% band; confirm OEM proposal for capability-class RFQ (NOT a named Hyosung unit for sale)Verify at quotation
StandardsIEEE C57; IEC 60076 as dual-path option
Lead time32-48 weeks AROVerify at quotationTarget, subject to confirmation.
Ship-toUS
HaulRail / heavy-permit
Campus fitBehind-the-meter campus, generic class

Rows marked Verify at quotation are quoted from class data and locked on the formal quotation, never assumed from this page.

Deep specs

  • Impedance: Indicative template - high-MVA thermal GSU %Z often 10-14% band; confirm OEM proposal for capability-class RFQ (NOT a named Hyosung unit for sale)
  • BIL: Indicative 345 kV class BIL per IEEE C57 - confirm 1050-1300 kV BIL; 24 kV LV class per gen voltage
  • Cooling: ONAF (confirm ODAF for high-MVA thermal). Forced-oil stages and cooler redundancy critical at ~990 MVA class - OEM propose.
  • Standards: IEEE C57 + IEC 60076 dual-path. Capability-class RFQ shape only - ratings confirmed per live one-line.
  • Bushings: HV 345 kV + LV ~24 kV bushings. REF listing = capability class from published OEM delivery pattern - not that serial for sale. Bushing LT may co-gate on HV classes.
  • FAT: Indicative - FAT witness + protocol as draw-gate. REF class does not imply existing factory reservation.

Full spec page

Delivery and compliance

  • IEEE C57
  • IEC
  • BABA interest
  • Interconnect ready
  • ISO 9001
  • UL

Compliance targets for the quotation. Exact standard parts are confirmed on the RFQ; badges are never presented as live factory certificates.

Order evidence spine

Every award closes these gates in sequence. The same spine appears on your quotation receipt and drives any financing review.

  1. Entity freezeBuyer-of-record / constructing taxpayer locked for any financing review.
  2. Slot confirmSupplier-stated production window, once evidence closes.
  3. FAT passedFactory acceptance test witnessed or document-reviewed.
  4. Serial recordedNameplate / serial captured against the PO line.
  5. ShippedUnit cleared the plant or port. Heavy-haul plan attached.
  6. Verified receiveSite receipt, condition, and serial check.
  7. Invoice approvedBuyer/EPC approved the OEM invoice (progress-pay path).

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