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Distribution Transformer

Oil-Immersed Distribution Transformer

Silverstone oil-immersed distribution transformers step medium-voltage feeders down to utilization voltage for utilities, industrial parks and infrastructure projects. Hermetically sealed or conservator-type tanks, mineral-oil filled, with off-circuit tap changers — configured to your grid code and delivered with routine test reports.

Key Specifications

Product classLiquid-immersed distribution transformer
Primary voltageUp to 36 kV class (11 / 22 / 33 kV typical)
Rated capacity25 kVA – 5 MVA typical range
CoolingONAN
Tap changerOff-circuit, ±2×2.5% typical
Loss levelsS11 / S13 low-loss series (sealed S11-M / S13-M · on-load SZ11 / SZ13)
Short-circuit impedance4 – 4.5% (10 kV class) · 6.5 – 8% (35 kV class)
Vector groupDyn11 / Yyn0 · Yd11 / YNd11 on 35 kV step-down
Extended range35 kV class up to 31.5 MVA · 66 – 500 kV power transformers on request
Reference standardIEC 60076 series
ConfigurationsPole-mounted · pad-mounted · substation-type
Sourcing baseSuzhou Industrial Park, Jiangsu, China

Typical configurations shown. Final ratings, dimensions and test reports are confirmed per project datasheet — include your specification with the inquiry. Download brochure (PDF) →

Typical Applications

Utility distribution networksIndustrial parksCommercial complexesRenewable evacuationRural electrification

Frequently Asked Questions

What information do you need to quote a distribution transformer?
Primary/secondary voltage, rated kVA, vector group, tapping range, installation type (pole, pad or indoor), quantity and destination port. With these, we return a priced offer with lead time within 24 hours on working days.
Do you support OEM or customized nameplates?
Yes. OEM branding is a core part of our supply service — custom ratings, paint systems, nameplates and documentation packages are available for bidding agents and EPC contractors.
Which test documents ship with the transformer?
Each unit ships with routine test reports per IEC 60076. Type test certificates for specific ratings are available on request.
Can you supply transformers as part of a complete substation?
Yes. Silverstone delivers turnkey substation EPC — transformers, switchgear, arresters and civil/electrical works under one contract. See our EPC service page.
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  • Quality-assured sourcing — OEM supported
  • IEC / IEEE engineering standards
  • Export documentation handled in-house
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