4600 kVA Inverter Duty Transformer

Additional information

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.