Earthing / Grounding Transformer
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Zig-Zag Transformer
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Special purpose transformer with zigzag or interconnected star winding
- Provides earth fault protection for ungrounded system
Zig-Zag or Star/Delta Configurations – Zig-zag windings offer efficient neutral creation with minimal voltage imbalance, while star/delta options provide versatility based on system design requirements.
Continuous & Short-Time Current Ratings – Designed to carry steady-state neutral current as well as withstand high momentary fault currents during single-phase faults.
High Thermal & Mechanical Strength – Robust insulation and mechanical bracing ensure reliability during fault events, preventing deformation, overheating, or insulation breakdown.
Custom Current Limiting Options – Can be paired with neutral grounding resistors (NGRs) to adjust fault current magnitude for system protection needs.
Available in Oil-Filled & Dry-Type Designs – Allows safe deployment across indoor, outdoor, and environmentally sensitive installations.
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Specifications
| Parameter | Value |
|---|---|
| Equivalent Rating | Up to 20 MVA |
| Voltage Class | Up to 33 kV |
| Neutral Fault Current & fault duration | As per customer requirement |
| Auxiliary Load winding | Up to 630 kVA as per customer requirement |
| Continuous Neutral Current | As per customer requirement |
| Frequency | 50/60 Hz |
| Cooling | ONAN/AN |
| Vector Group | ZN0, ZNyn1 or ZNyn11 |
| Winding Material | Cu / Al |
| Tapping | Off circuit links/switch |
| Insulating Medium | Mineral Oil, Esters, Resin/Varnish |
Technical Information
| Parameter | Value |
|---|---|
|
Special purpose transformer with zigzag or interconnected star winding |
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Provides ground fault protection in 3-Phase, 3 wire system |
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With or without auxiliary winding for supplying local loads |
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Supply segments |
Industries |
| EHV Substations |
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