36 kV High-quality ONAN Grounding Transformers
| Brand | Vziman |
| Model NO. | 36 kV High-quality ONAN Grounding Transformers |
| Rated voltage | 36kV |
| Rated frequency | 50/60Hz |
| Series | JDS |
36 kV High-quality ONAN Grounding Transformers Description
36 kV High-quality ONAN Grounding Transformers are intended to establish an artificial neutral point for ungrounded three phase power systems.
The kVA rating of an grounding transformer is contingent upon the normal line-to-neutral voltage and the magnitude of fault current for a specified duration, typically ranging from seconds to minutes. In the event of line-toground faults, these transformers offer a direct path for fault currents to ground, thereby constraining fault currents and transient over-voltages.
36 kV High-quality ONAN Grounding Transformers typically handle short-circuit ground current until the circuit breaker resolves the fault. Consequently, they are equipped with short-time ratings. We have hermetic type, dry type and oil type transformers.
36 kV High-quality ONAN Grounding Transformers Test List
- Visual & Dimensional Check
- Measurement of Voltage Ratio
- Measurement of Winding Resistance
- Measurement of Zero Sequence Impedance
- Measurement of No-Load Loss and Current
- Measurement of Short-Circuit Impedance and Load Loss
- Dielectric Tests
- Separate Source AC Withstand Voltage Test
- Induced AC Withstand Voltage Test
- Lightning Impulse Test
- Temperature Rise Test
- Final Check
For special tests, please contact us.
36 kV High-quality ONAN Grounding Transformers 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.
The core advantages include low operation noise, no additional power consumption for cooling systems, simple structure with fewer failure points, and lower maintenance costs. The passive cooling design ensures stable operation in scenarios with low to medium load rates, making it ideal for applications that require quiet and reliable operation.
Q: What scenarios are 36 kV high-quality ONAN grounding transformers most suitable for?
A:They are most suitable for 36 kV power systems with stable load, low noise requirements, and limited maintenance conditions, such as urban distribution networks, industrial parks, commercial buildings, and rural power grids. They are especially applicable to outdoor installations where forced cooling equipment is not easy to maintain.
Q: How to ensure the cooling effect of 36 kV high-quality ONAN grounding transformers during long-term operation?
A:To ensure the cooling effect, it is necessary to keep the cooling fins and tank surface clean and free of dust, oil stains, and debris; ensure sufficient ventilation space around the transformer (avoid blocking the air flow); conduct regular inspections of oil level and oil quality to maintain good thermal conductivity of the insulating oil; and avoid long-term overload operation beyond the rated capacity.
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