Earthing Transformers
Earthing transformers providing an artificial neutral point for unearthed or delta-connected MV systems — enabling reliable ground-fault detection, controlled fault clearance, and protection coordination in industrial and renewable networks.
Engineering Features
Zigzag or Star-Delta Winding
Standard zigzag configuration for compact footprint, or star-delta with separate auxiliary winding when station service is required.
Technical Data
| Parameter | Range / Value |
|---|---|
| Rated Power | 50 kVA – 5 MVA (continuous equivalent) |
| System Voltage | Up to 36 kV |
| Frequency | 50 / 60 Hz |
| Winding Type | Zigzag (Z) / Star-Delta (YNd) |
| Short-Time Current | Project-specific (typ. 400–4000 A for 10 s) |
| Cooling | ONAN / KNAN |
| Insulation Class | BIL 75 / 125 / 170 kV per voltage class |
| Auxiliary Winding | Optional 230/400 V |
| Standards | IEC 60076-6 / IEEE C57.32 / IEEE C62.92 |
| Design Life | 30+ years |
Standard range parameters — custom specifications available on request.
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
Zigzag and star-delta earthing transformers for UK & Ireland utility, industrial and renewable service. 50 kVA to 5 MVA at up to 36 kV per BS EN 60076-6, providing an artificial neutral on unearthed delta or IT systems. Used with neutral-earthing resistors (NER) and reactors for fault-current limitation in DNO secondary distribution, renewable plants and industrial process power.
Where Earthing Transformers Excel.
UK Renewable IPP Earthing
Zigzag earthing transformers providing artificial neutral on UK solar and wind farm collection systems for G99 grid-code compliance.
DNO Distribution Network Earthing
BS EN 60076-6 zigzag transformers for UK distribution network operator neutral-earthing on unearthed delta systems including UKPN, NIE Networks, Scottish Power and SSE frameworks.
Industrial IT-System Earthing
Star-delta earthing transformers for UK industrial process plants requiring artificial neutral on IT or unearthed systems.
BESS Site Neutral-Earthing
Earthing transformers for UK Battery Energy Storage System sites — paired with NER for fault-current limitation and grid compliance.
Frequently Asked Questions
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