Distribution Liquid Transformers
Hermetically sealed, low-loss distribution transformers for utility networks and industrial feeders. Available in ratings from 25 kVA to 5 MVA with guaranteed efficiency levels exceeding Tier 2 requirements.
Engineering Features
Hermetically Sealed
No conservator, no breather — completely sealed for maintenance-free operation.
Technical Data
| Parameter | Range / Value |
|---|---|
| Rated Power | 25 kVA – 5,000 kVA |
| Primary Voltage | 6.6 – 36 kV |
| Secondary Voltage | 230 / 400 V – 690 V |
| Frequency | 50 / 60 Hz |
| Impedance | 4% – 6% |
| Vector Group | Dyn11, Yyn0, Dzn0 |
| Temperature Rise | Top oil ≤ 60K, Winding ≤ 65K |
| Altitude | Up to 1000m (higher on request) |
| Ambient Temp | -25°C to +50°C |
| Efficiency | ≥ 99.2% at rated load |
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
KEMA Certified
Independent short-circuit witness testing
EcoDesign Tier 2
EU 548/2014 efficiency compliance
Our ENATS 35-1 compliant distribution transformers are engineered for the United Kingdom's six Distribution Network Operators — UKPN, NIE Networks, SP Energy Networks, Northern Powergrid, Electricity North West and SSEN. Available from 50 kVA to 5 MVA at 11 kV, 20 kV and 33 kV, every unit is BS EN 60076 type-tested, EcoDesign Tier 2 efficient and short-circuit certified at KEMA. Through our UK arm Sura Power, we have delivered 450+ DNO-approved units serving secondary substations, Network Rail traction depots, EV-charging hubs and renewable-grid interconnections from England and Scotland to Wales and Northern Ireland.
UKPN 11kV Secondary Substations · Greater London & South East
NIE Networks Distribution Feeders · Northern Ireland
SP Energy Networks · Central & Southern Scotland
Network Rail Traction Power · West Coast Main Line
Northern Powergrid · Yorkshire & North East
G99 Renewable Interconnection · UK Wind & Solar Farms
Where Distribution Liquid Transformers Excel.
UK DNO Networks (UKPN, NIE, SP Energy)
ENATS 35-1 compliant 11kV/33kV secondary substation transformers for UKPN, NIE Networks, SP Energy and Northern Powergrid distribution networks.
Network Rail Traction Power
Trackside auxiliary and traction power distribution transformers for UK rail electrification, signalling and depot infrastructure.
EV Charging Infrastructure UK
G99-compliant distribution transformers for high-power EV charging hubs, motorway service stations and fleet depots.
UK Commercial & Mixed-Use Developments
BS EN 60076 transformers for office estates, retail parks, hospitals and high-rise residential schemes across England, Scotland and Wales.
Frequently Asked Questions
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Related Knowledge
FAQs, glossary terms and sizing steps mapped to this product.
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