4800 kVA Pad Mounted Transformer
- Primary Voltage Ratings: 34.5kV
- Secondary Voltage Ratings: 480V/277
- H.V. TAP RANGE: +/- 2@ 2.5% HV taps
- TYPE: Pad mount
- BIL: 150/30kV
- Standards: IEEE, ANSI, NEMA
- Application: BESS (Megapack)
- Power Rating: 4800kVA
- Certificate: UL
- Cooling Method: KNAN
The 4800 kVA transformer is designed as a dead-front pad-mount unit, specifically tailored for integration into the Tesla Megapack 4-hour system. It employs a double-split design, where its low-voltage winding is divided into two 2400 kVA branches. Each Megapack benefits from a dedicated 2400 kVA capacity on both sides, ensuring efficient energy distribution. This design is exceptionally well-suited for large-scale energy storage projects, facilitating electrical isolation, minimizing electromagnetic interference, and enhancing power output quality. Additionally, in the event of a short circuit in one branch, it effectively limits the short-circuit current while maintaining the other branch at a stable level.
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Transformer Factory Acceptance Test
Factory acceptance testing is carried out by IEEE C57.12.90 requirements, including the "Routine" and "Design" listed below
Routine Test
- Resistance measurements of all windings on the rated voltage tap
- Ratio tests on the rated voltage connection as listed on the nameplate
- Polarity and phase relation tests on the rated voltage connection
- Impedance voltage and load loss at rated current and rated frequency on the rated voltage connection, and at the tap extremes of the first unit of a new design
- Dissolved gas in oil analysis
- Winding insulation resistance
- Lightning impulse
- Low frequency
- Oil Leaks
- Turns ratio & phase angle accuracy test.
- Winding resistance test
- Polarity test
- No-load losses and excitation current at 100% of rated voltage and at rated power frequency on the rated voltage tap connections
- Excitation test
Design Test
- Resistance measurements of all windings on the rated voltage tap
- No-load losses and excitation current at 110% of rated voltage and at rated power frequency on the rated voltage tap connections
- Temperature rise at minimum and maximum ratings of the first unit of a new design
- Audible sound level
- Lightning impulse
- Partial discharge test
- Lifting and moving devices
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