1,000+ Electrical Transformers (7.2–34.5 kV, 25–3000 kVA) — UL Evaluated, Certificate of Compliance Available — In Stock & Ready to Ship from Houston, CA & Florida. Contact Us Today!
Primary Voltage Ratings: 33 000 V
Secondary Voltage Ratings: 480 V
H.V. TAP RANGE: -5 % to +5 %
TYPE: Inverter Duty Transformer
Standards: AS/NZS
Application: BESS
Power Rating: 4600 kVA
Cooling Method: ONAN
The 4600 kVA Inverter Duty Transformer boasts rugged construction, high overload capability, and low noise and vibration levels. Purpose-built for energy storage applications, it excels under high-frequency and transient load conditions. Specifically tailored for the Australian market, this transformer complies meticulously with AS standards.
| Rating | 4.6 MVA / 2.3 MVA / 2.3 MVA |
| Phase | 3 |
| Frequency | 50 Hz |
| No. of windings | 3 |
| Nominal primary voltage | 33 kV |
| Nominal secondary voltage | 480 V |
| Nominal tertiary voltage | 480 V |
| Vector group | Dyn11yn5 |
| Impedance | 7.5 % ) |
| Transformer efficiency | 99% (minimum) |
| Operating mode | Single |
| Location Degree of protection Harmonics compliance Method of cooling Insulation level – primary Power frequency withstand voltage-primary Lightning impulse withstand voltage – primary | Outdoor IP56 As per AS/NZS Natural Convection 36 kV (rms) 70 kV (rms) 200 kV (peak) |
Contact Daelim Transformer for special requirements
| Oil level low (alarm) | With externally readable gauge |
| Oil level trip | Yes |
| Oil temperature high (alarm) | With externally readable gauge |
| Oil Temperature trip | Yes |
| Winding temperature RTD | Yes |
| Pressure relief device | Yes |
| Winding temperature high (alarm) | With externally readable gauge |
| Winding temperature trip | Yes |
| Main tank Buchholz relay | Yes |
| Type | Off load tap changer at primary winding |
| Tapping Range | -5 % to +5 % |
| Principal tap | 33,000 V |
| Number of tap positions | 5 |
| Change per step | 2.5 % |
| Temperature (max/min) | 50 / 0 degC |
| Average Summer Dry Bulb temperature | 30.4 degC |
| Relative humidity (max/min) | 20 – 65 % |
| Maximum Design Humidity | 100% |
| Site elevation | < 50 m |
| Proximity to the Sea | 10 km |
| Atmospheric corrosivity category | C4 |
| Wind Region | D |
| Terrain Category | 1 |
| Pollution level | IV – Very Heavy |
The 4600 kVA transformer features a low-voltage double-split structure, with its capacity divided into two equal parts of 2300 kVA each. These segments can operate independently or simultaneously, each connected to a battery pack separately.
Double-split transformers facilitate electrical isolation between the two inverters, effectively reducing electromagnetic interference and circulating current between the branches. Furthermore, they ensure that the AC outputs of the inverters are filtered individually, resulting in minimal output current harmonics and enhanced power quality.
In the event of a short circuit in one branch, the transformer not only effectively limits the short-circuit current but also maintains the voltage of the other branch at a certain level, thus ensuring uninterrupted user operations.
Hence, it is evident that double-split step-up transformers are the preferred choice for large-scale photovoltaic power generation and energy storage projects.
With extensive experience in large-scale photovoltaic power generation and energy storage projects, Daelim Transformer can meet all technical requirements associated with such projects. Additionally, our professional team can significantly save on time costs, and our fast delivery times ensure the smooth completion and delivery of projects. Contact us now to discuss your next project.
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