Pad-Mounted Transformers

last update: Oct. 15 2023

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Three-phase pad-mounted compartmental type distribution transformers are designed for indoor or outdoor locations. Unobtrusive construction allows them to be installed in locations exposed to public view like schools, shopping centers and industrial sites. A wide array of configurations and accessories are available to meet a broad range of application demands.

Standard Ratings

• • 45, 75, 112.5, 150, 225, 300, 500, 750, 1000, 1500, 2000 & 2500 KVA ( Above 2500 KVA as erquired)

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

Standard de-energized before operating tap changer

• • Two - 2½% taps above and below rated voltage 

  • NEMA taps (14400, 13800, 13200, 12470, 12540 V)

Standard secondary voltage & insulation level (BIL)

      The basic insulation level (BIL) of the secondary voltage shall be 30 kV.

• • 208Y/120 V

  • 230Y/133 V

  • 400Y/231 V

  • 480Y/277 V

  • 240D/120 MIDTAP 

  • 480D  

  • 240D

Standard primary and secondary connections

• • Delta - Wye

  • Grounded Wye - Wye

  • Delta - Delta

Standard Impedance Voltage (%)

• • 150KVA~400KVA 3.0% ~ 4.0%

  • 400KVA~750KVA 3.5% ~ 4.5%

  • 750KVA~1500KVA 4.0% ~ 5.5%

  • 1500KVA~2500KVA 5.0% ~ 6.0%

Standard Sound Level (Average) decibels

• • 150KVA~400KVA 55 db

  • 400KVA~750KVA 58 db

  • 750KVA~1500KVA 60 db

  • 1500KVA~2500KVA 62 db

Following is required it shall be clearly stated on the inquiry:

• • Overcurrent protection by a Bay-O-Net expulsion fuse

  • Overcurrent protection by a Bay-O-Net expulsion fuse/ with a partial range under-oil ELSP current-limiting fuses

  • Primary loadbreak dry-well fuse canisters

  • Provided with an on/off loadbreak switch

  • 4-position Loadbreak Switch / V-Blade Switch / T-Blade Switch

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.

Other Accessorie

• • Lifting Lugs (4)

  • Bolted Cover w/Nut Guard

  • Cabinet Hinges & Mounting Studs

  • 20” Deep Cabinet (45-1000 kVA)

  • 24” Deep Cabinet (1500-2500 kVA)

  • 30” Deep Cabinet (@34.5/19.92kV) 

  • Low Voltage 6-Hole / 8-Hole Spade / 10-Hole Spade w/Supports

Options make the product non-standard

• • Low Voltage Spade - 12, 16, 20-Hole 

  • SS Tank Base & Cabinet

  • Auxiliary Contacts for Liquid Level Gauge

  • Auxiliary Contacts for Dial Type Thermometer 

  • Auxiliary Contacts for Pressure/Vacuum Gauge