Power & Distribution Transformers
Wound cores for distribution and power transformers reduce no-load loss and audible noise. We wind, cut and anneal grain-oriented silicon steel cores from 23Q110 to 30Q120, in toroidal, C-core and three-phase 3D formats.
Key requirements
- Lower no-load loss vs stacked cores
- ±0.1 mm dimensional tolerance
- Annealed to relieve stress after cutting
Recommended cores
OD-CoreSilicon Steel Toroidal Core
Grain-oriented silicon steel toroidal cores for instrument transformers, power transformers and reactors.
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CD-CoreC-Core
Cut cores for single-phase transformers & reactors, easy coil assembly.
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JTR / C-JTRStepped Core (JTR Type)
Multi-step lamination cores, JTR type. Cut version is C-JTR. Optional two-component black paint, custom sizes to your drawing.
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UNICOREUnicore Core
Unicore type rectangular-window wound cores in grain-oriented silicon steel, secured with green banding tape, sized to your drawing.
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TRI-3DThree-Phase 3D Wound Core
Three-phase three-column 3D wound core with symmetrical magnetic path and low no-load loss, for oil-immersed and dry-type distribution transformers.
View specifications →FAQ
Which silicon steel grades do you use for transformer cores?
Typically 23Q110, 27Q100 and 30Q120 grain-oriented silicon steel. Other grades can be sourced on request.
Can you match an existing core drawing?
Yes — send a PDF or CAD drawing with OD, ID, height and grade, and we will quote a made-to-drawing core.
Request a quote or sample
Send your drawing, dimensions or specs — our engineers reply within 24 hours.