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Equipment/Substation & power

POWER & TRANSMISSION

Substation & power transformers

Purpose-built transformers for oil & gas, industrial, solar, utility, data center, and commercial projects, with mitered cruciform cores and cylindrical windings.

500 kVA–500 MVACAPACITY RANGE
5–850 kVVOLTAGE
Request a quote
Built to IEEE / ANSI
or IEC standards
Substation power transformer with cooling fans inside manufacturing plant BUILT AROUND YOUR SPECIFICATION
Substation power transformer with cooling fans inside manufacturing plant Substation power transformer under factory inspection Power transformer control cabinet with internal wiring and relays Substation transformer rear panel with gauges and control box Substation power transformer with radiator bank and fan cooling

THE RIGHT EQUIPMENT

Power at a different scale.

As data center expansion and AI-driven load growth reshape the grid, these transformers are built for the evolving demands of modern energy infrastructure. Each is engineered to IEEE or IEC standards to suit your project, fully customizable, and made with high-grade materials, including mitered cruciform cores and circular copper windings, for long-term reliability and thermal efficiency.

TYPICAL LEAD TIMES

HV power transformers6 mo
Distribution class9 wks

We offer expert witness testing and detailed reports before shipment. On site, our team can oversee assembly, installation, and testing, or handle it directly.

Explore field services
Application-specific technical review Strict quality control at every production stage Warranty covering materials & workmanship U.S.-based service, technical & warranty support Top-tier quality without the premium price tag

AT A GLANCE

Technical specifications

SpecificationDetails
Product range500 kVA–500 MVA
Voltage range5–850 kV
Design standardsIEEE / ANSI or IEC, per project
Core & windingsMitered cruciform core; cylindrical windings
Winding materialAluminum or copper
Tap changingDETC or OLTC
FluidType II mineral oil or FR3
Typical lead time6 months (HV power); 9 weeks (distribution class)

Ranges describe available configurations. Final ratings, standards, accessories, and delivery are confirmed for your project.

CONFIGURED FOR YOUR APPLICATION

Design options & accessories

Core & windings
StandardOption
3-legged coreShort-circuit strength—
Cylindrical windingsShort-circuit strength—
Mitered coreLow losses—
Aluminum windingsLower costCopper windingsReliable longevity
K-4 ratingHandles harmonicsK-9 or K-13 ratingFor higher harmonic loads. See K rating guide
Two windingsIsolation transformer3, 4, or 5 windingsLower secondary amps; drives and special applications
Auto-transformer—
Tank, radiators & bushings
StandardOption
Panel-type radiatorsFor coolingGalvanized or stainlessBetter corrosion resistance
Welded radiatorsFixed to the tankValved, removable radiatorsEasier maintenance planning
Live-front HV bushings—
Air terminal chamberEnclosed box for bushingsFull-length ATCBottom sits on the slab, same as the tank
Throat for bushingsFor close couplingFlange for bushingsSimilar to a throat, typically full length, for close coupling
Fluid & cooling
StandardOption
Type II non-PCB mineral oilONAN cooling; lowest costFR3 natural ester (vegetable oil)KNAN cooling; high flash point
ONAN, mineral oilOil cooling and ambient airONAN/ONAFFans increase the maximum kVA
KNAN, FR3Base kVA with FR3 and ambient airKNAN/KNAFFans increase the maximum kVA
Included as standard
  • Tap changerDETC (de-energized tap changer) or OLTC (on-load tap changer)
  • Oil temperature, oil level & pressure/vacuum gaugesOn the front of the transformer, in the LV compartment
  • Nitrogen fill port or conservator tankOn the front of the transformer
  • Drain / sample valve
Optional features & accessories
  • 2 stages of fan coolingONAN/ONAF/ONAF or KNAN/KNAF/KNAF for higher capacity
  • LV cable supportsSupport for heavy cables; standard on 12-hole spades
  • Sudden pressure rise relay
  • Cover-mounted pressure release device
  • Electrostatic shieldMitigates voltage transients and anomalies generated to the source. Common with K-rated and drive isolation transformers.
  • Gauges with contactsOil level, oil temperature, and pressure/vacuum gauges wired to an external control box

SIZING FOR HARMONICS

K rating information to consider.

Every unit is K-4 rated as standard, with K-9 and K-13 designs for heavier harmonic loads. K-9 is commonly used for 6-pulse drives.

Values are for quick reference. We can help determine the right K rating for your loads and system configuration. Additional K rating improves efficiency in most cases.

Ask an engineer
Load typeRecommended K factor
According to IEEE C57.110
Computer data centers3.5–4
UPS systems3.0–3.8
Fluorescent lighting2.0–2.5
According to IEC 60076-7
Variable frequency drives4.0–5.5
Arc furnaces5.0–6.5
Industrial drives4.0–5.0

START YOUR SPECIFICATION

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your fit.

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