Grounding Transformers are designed to provide an artificial, neutral point for ungrounded three phase power systems.
During the line-to-ground faults, grounding transformers provide an easy path to ground faults, thus limit the fault currents and transient over-voltages.
Grounding transformers normally carry short-circuit ground current until the circuit breaker clears the fault. Therefore, they have short time ratings.
The kVA rating of a earthing transformer depends on the normal line-to-neutral voltage and the fault current value for a specified time, such as seconds to minutes.
| Technical Specifications | |
|---|---|
| Types | Dry or oil-immersed [ZN (Zigzag), ZNyn, YNd(open), Ii0] |
| Voltage | Up to 36 kV |
| Current | Up to 3000 A* |
| Duty (seconds) | 10 /30 / 60 or others |
| Cooling method | ONAN,ONAF AN,AF |
| Frequency | 50 Hz / 60 Hz |
| Installation | Indoor / Outdoor |
| Ambient Temperature | -30°C to 55°C* |
| Standards | IEC 60076-6 IEC 60076-1 |
| Enclosure Options | Transformer cabinets for any IP degrees with:
- CT - VT - Isolation switch |
*Consult factory for higher values.
