Pad Mounted Transformer for BESS System 4.0 MVA in Riverside County, California

Today, Daelim Transformer is proud to introduce a pad-mounted transformer for a 4.0 MVA Battery Energy Storage System (BESS) project located in Riverside County, California.

This pad-mounted transformer is specifically designed for deployment at a Battery Energy Storage power generation facility. Its robust design is engineered to withstand harmonic voltages and currents emanating from inverters, transient over-voltages caused by switching surges and faults, and the significant variations in transformer loading commonly encountered in BESS projects. The transformer is meticulously crafted to comply with the specifications outlined in the California Electrical Code Article 450.

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In this project, the pad mounted transformer will be employed in a step-down configuration, further enhancing its adaptability and efficiency within the energy storage system. Daelim Transformer remains committed to delivering cutting-edge solutions that meet the unique demands of modern energy storage facilities.

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Key Technical Specifications

Transformer Type: Three Phase Transformer - Pad-Mounted
Capacity: 4000 kVA（4 MVA）
Cooling Class: ONAN (Oil Natural, Air Natural)
Oil Type: Mineral
Temperature Rise: 65°C (High thermal capacity paper on all windings)
Frequency: 60 Hertz
Rated Voltages:
Primary Voltage Winding (H): 12.47 kV
Secondary Voltage Winding (X): 34.5 kV
Impedance at Base Capacity Rating: 5.75%
Service Conditions

Ambient Temperature Range -40°C to 50°C
Altitude above Sea Level <3,300 ft

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Daelim Transformer Solution

Features and Design Highlights

Electrostatic Shield: Our transformer is engineered to withstand harmonic voltages, transient over-voltages, and dynamic load variations inherent in BESS projects, ensuring uninterrupted power delivery.
Versatile Voltage Operation: Capable of operating within a +/- 10% voltage range, our transformer adapts to varying energy demands, providing flexibility and efficiency.
Tap Changer: Located on the High Voltage Winding with five taps at 2.5%.
External Compartments: Equipped with Nitrogen filling plug, Dial type thermometer, Vacuum/pressure gauge, Liquid level gauge, and accessible Oil Sampler/Drain Valve.
Doors: Each compartment features independent auto-latching three-point latching systems, resistant to weather elements.

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Compartment Details

12.47 kV Compartment

Loop feed bushings for termination with 600 Amp dead break elbows conforming to ANSI C57.12.26 standards.
Dead front construction, expulsion type fuses, and NEMA 2-hole tank ground. To address the issue of excessive current, engineers opted for protection by employing six Bay-O-Net fuses.

34.5 kV Compartment

Similar specifications to the 12.47 kV compartment conforming to ANSI C57.12.26 standards.

Compartment Location

High-voltage and low-voltage compartments are located on one side of the transformer tank, separated by a vertical steel barrier.

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Finish and Coating

ANSI 61 light gray protective coating, resistant to corrosion. Touch-up paint provided.

Sectionalizing Oil Immersed Load Break Primary Switches

Ratings: 38 kV and 300 Amps
Design: Two-position, gang-operated, rotary, permanently attached, and hook stick operable on both incoming and outgoing sides.

Factory Tests

Daelim Transformer commits to conducting comprehensive factory tests following ANSI/IEEE C57.12.90 standards. These include resistance measurements, polarity and phase relation, ratio, no-load and load losses, impulse tests, dissolved gas in oil analysis, insulation power factor test, and oil test.

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Delivery Commitments

Post Factory Acceptance Test (FAT), Daelim Transformer pledges to submit electronic test reports within three days. Within two months of order placement, the company will provide the client with all relevant documents, including Outline Drawings, Nameplate drawing, Schematic and wiring diagrams, and product data sheets.

Daelim Transformer - Elevating BESS Solutions

Choose Daelim Transformer for your energy storage projects. There are professional & experienced engineering team who will provide you with the best transformer solutions and options. Daelim transformer served more than 100+ BESS projects and more than 500MW+ with its qualified & UL listed transformer within lead time below 30 weeks for most projects.