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Substation Transformer

last update: Oct. 14 2011

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The Substation Transformer is designed for commercial and industrial applications to convert distribution voltages to utilization voltages. They are constructed to interconnect easily with both primary and secondary switchgear. They can be used in outdoor or indoor (when filled with R-Temp or Envirotemp FR3 fluid) load center substations.


Standard Ratings
  • Three Phase 500, 750, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 5000, 6000 & 7500 KVA
Standard Cooling  OA/NA,

Standard Winding Temperature Rise 65˚C 

Standard High-voltage & insulation level (BIL)
  • 13200 V BIL: 95KV
  • 13800 V BIL: 95KV
  • 14400 V BIL: 95KV
  • 23900GrdY/13800 V BIL: 125KV
  • 24940GrdY/14400 V BIL: 125KV
  • 34500GrdY/19920 V BIL: 150KV
  • 34500 V BIL: 200KV
Standard de-energized before operating tap changer
  • Two - 2½% taps above and below rated voltage
Standard secondary voltage & insulation level (BIL)
      The basic insulation level (BIL) of the secondary voltage shall be 30 kV.
  • 480Y/277 V
  • 400Y/231 V
  • 208Y/120 V
  • 240D V
  • 480D V
  • 600Y/347 V
  • 600D V
  • OTHER VOLTAGES UNDER 1000V
Standard Impedance Voltage (%)
  • 150KVA~400KVA 3.0% ~ 4.0%
  • 400KVA~750KVA 3.5% ~ 5.0%
  • 750KVA~1500KVA 4.0% ~ 5.75%
  • 1500KVA~2500KVA 5.0% ~ 6.0%
  • upper 2500KVA 5.5% ~ 7.5%
Standard Sound Level (Average) decibels
  • 150KVA~400KVA 56 db
  • 400KVA~750KVA 58 db
  • 750KVA~1500KVA 60 db
  • 1500KVA~2500KVA 62 db

Accessories: Any additional accessories will be specified on the inquiry
  • Externally operated off- load tap changer 
  • Pressure relief valve 
  • Drain valve with sampler on top and bottom 
  • Liquid level gauge 
  • Oil temperature gauge 
  • Ground pad and clamp with grounding 
  • Stainless Diagrammatic name plate 
  • Jacking Pad.
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