Medium Power Transformers (GSU)
Up to 150 MVA — every power transformer is custom-designed to your system requirements, type-tested to IEC 60076 or ANSI/IEEE C57, and backed by -certified short-circuit withstand capability.
Engineering Features
Short-Circuit Testing
Independently witnessed short-circuit withstand testing for proven reliability under fault conditions.
Technical Data
| Parameter | Range / Value |
|---|---|
| Rated Power | Up to 150 MVA |
| Primary Voltage | Up to 220 kV |
| Secondary Voltage | 6.6 – 36 kV |
| Frequency | 50 / 60 Hz |
| Impedance | 8% – 14% (customizable) |
| Vector Group | As per specification |
| Noise Level | ≤ 70 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
ENATS 35-1
DNO-approved distribution transformer specification
ENATS 35-2
UK secondary substation transformer standard
G99 Compliant
Engineering Recommendation G99 grid interface
BS EN 60076
British Standard for power transformers
EcoDesign Tier 2
EU 548/2014 efficiency compliance
ENA TS 35-6 compliant medium power transformers for UK primary substations and grid-connection points. Rated 5 MVA to 150 MVA at 33 kV, 66 kV and 132 kV with on-load tap changers, every unit is BS EN 60076 type-tested and short-circuit certified. Through ETS UK we serve UK DNOs with primary distribution transformers, generator step-up units for renewable interconnection and grid-coupling autotransformers.
Where Medium Power Transformers (GSU) Excel.
UK Primary Substations (DNO 33/11 kV)
ENA TS 35-6 compliant 33/11 kV primary substation transformers for UK distribution network operator frameworks including UKPN, NIE Networks and Scottish Power.
UK Transmission Sub-Transmission
BS EN 60076 transformers for 132 kV sub-transmission interface substations across the UK transmission network.
UK Renewable Grid Connection
G99-compliant grid step-up transformers for onshore wind, BESS and solar projects connecting to UK DNO networks.
UK Heavy Industry & Rail Depots
Industrial substation transformers for steelworks, chemicals, ports and Network Rail traction power depots.
Frequently Asked Questions
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Related Knowledge
FAQs, glossary terms and sizing steps mapped to this product.
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