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!  

4800 kVA Pad Mounted Transformer

Additional information

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

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 4-hour system. It employs a double-split design, where its low-voltage winding is divided into two 2400 kVA branches. Each Battery Pack 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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  • Enclosure rating : Out door ANSI
  • Windings : 2
  • MV Winding Config: Delta
  • LV Winding Config : Wye
  • Power Rating: 4800kVA
  • Primary Voltage: 34.5kV Delta
  • BIL HV 150kV
  • Secondary Voltage: 480V/277 Wye      
  •  BIL LV 30kV       
  • Frequency: 60 HZ
  • Temperature Rise: 75 °C
  • Cooling Class: KNAN
  • Impedance: 7.5% @4800 kVA
  • Color: RAL 9016 Traffic White

 

Contact Daelim Transformer for special requirements

 

  • Dial-type thermometer
  • Load break switch
  • Liquid level gauge
  • Pressure-vacuum gauge
  • 1 in drain valve with sample valve
  • Pressure relief valve
  • 1 in upper fill/filter press connection
  • Internal CT’s
  • NC alarm contacts on temperature, liquid level and pressure/vacuum gauges and pressure relief device
  • IR window MV and LV Cabinets
  • One-piece 900A HV bushings
Daelim Transformer Certificates

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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Daelim Belefic IEEE PES T&D 2026