ONAN Oil-immersed Grounding Transformer-33kV 34.5kV 35kV 36kV
| Brand | Vziman |
| Model NO. | ONAN Oil-immersed Grounding Transformer-33kV 34.5kV 35kV 36kV |
| Rated voltage | Up to 36 kV |
| Rated frequency | 50/60Hz |
| Series | ZN |
Product Introduction
ONAN Oil-immersed Grounding Transformer is intended to establish an artificial neutral point for ungrounded three phase power systems.
The kVA rating of an ONAN Oil-immersed 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.
ONAN Oil-immersed Grounding Transformer 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.
Product Parameters
| 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: - VT - Isolation switch |
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.
When a line-to-ground fault occurs, ONAN Oil-immersed Grounding Transformer provides a direct grounding path for fault currents. It usually bears the short-circuit ground current until the circuit breaker clears the fault, so it is equipped with short-time ratings to adapt to this working condition.
Q:Besides the oil-immersed type, what other types of grounding transformers are available?
A:In addition to ONAN Oil-immersed Grounding Transformer, there are also hermetic type and dry type grounding transformers available, providing diverse options for different application scenarios and environmental requirements.
Q:Why are ONAN Oil-immersed Grounding Transformer equipped with short-time ratings?
A:ONAN Oil-immersed Grounding Transformer only need to handle short-circuit ground current for a short period (until the circuit breaker resolves the fault) instead of long-term continuous operation under fault conditions. Thus, they are equipped with short-time ratings to match this intermittent fault-bearing working characteristic.
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