EHV Power Transformers
Extra high voltage power transformers for transmission-class applications. Up to 300 MVA, 220–400 kV — KEMA short-circuit certified with advanced directed cooling.
Engineering Features
KEMA Short-Circuit Testing
KEMA-witnessed short-circuit withstand testing for proven reliability under fault conditions.
Technical Data
| Parameter | Range / Value |
|---|---|
| Rated Power | 100 – 300 MVA |
| Primary Voltage | 132 – 400 kV |
| Secondary Voltage | 11 – 36 kV |
| Frequency | 50 / 60 Hz |
| Impedance | 10% – 14% (customizable) |
| Vector Group | As per specification |
| Noise Level | ≤ 75 dB(A) at 1m |
| Total Losses | Per IEC/IEEE guaranteed values |
| Temperature Rise | Top oil ≤ 60K, Winding ≤ 65K |
| Insulation Level | Full BIL / SIL as per class |
Standard range parameters — custom specifications available on request.
Related glossary terms
IEEE C57.12
ANSI/IEEE distribution transformer standard
ANSI C57.12.00
General requirements liquid-immersed
DOE 2016
US Department of Energy efficiency rule
NEMA TR1
Sound level & loss tolerances
UL Listed
Underwriters Laboratories safety mark
IEEE C57.110
Harmonic-loaded transformer rating
EHV power transformers for the North American Bulk Electric System — 100 MVA to 300 MVA at 230 kV, 345 kV and 500 kV. Designed to IEEE C57.12.00 / ANSI C57 with KEMA short-circuit certification, directed cooling and seismic qualification, our EHV units serve transmission utilities (ITC, AEP, MISO members), Independent System Operators (ERCOT, PJM, MISO) and gigawatt-scale renewable-IPP step-up projects across the United States.
ITC & AEP 345kV Transmission · Midwest USA
ERCOT 500kV Renewable Step-Up · West Texas
PJM 500kV Substation Autotransformers · Mid-Atlantic
Hyperscale Data-Centre Bulk Power · 230kV Service
Combined-Cycle Power Plant GSU · Gulf Coast
MISO Transmission Substations · Upper Midwest
Where EHV Power Transformers Excel.
230 kV / 345 kV Transmission Substations
IEEE C57.12 EHV transformers for 230 kV and 345 kV transmission substations across PJM, MISO, ERCOT and SPP.
Large GSU Duty (US Generation)
Generator step-up transformers for combined-cycle gas, nuclear and pumped-hydro generation across North America.
Utility-Scale BESS Interconnection
EHV grid-tie transformers for >100 MW battery storage projects in California, Texas and the Southwest.
Cross-Border & Inter-Regional Interconnection
IEEE C57.12.00 auto-transformers for inter-regional and US-Canada / US-Mexico transmission tie-lines.
Frequently Asked Questions
Related Knowledge
FAQs, glossary terms and sizing steps mapped to this product.
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