COOPER 7500/9975kVA Liquid-Filled Transformer, 13.8kV Pri., 4160V Sec., ONAN/ONAF
COOPER

7500/9975 kVA 13.8kV to 4.16kV ONAN/ONAF Power Transformer

SKU: 158681
Condition: Used
Year: 2013
Price:
$211,314

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Description

Heavy-duty Cooper Power Systems three-phase liquid-filled transformer rated 7,500 kVA ONAN / 9,975 kVA ONAF, designed for stepping 13.8kV primary power down to 4.16kV for industrial and mining distribution applications. The transformer is equipped with large external cooling radiator banks and Krenz-Vent forced-air cooling fans, allowing the unit to increase from its 7,500 kVA self-cooled rating to 9,975 kVA with forced-air cooling. This transformer is configured with a 13,800Y/7,970V high-voltage primary and 4,160V secondary, operating at 60 Hz with a 65°C temperature rise and 6.4% impedance at 85°C. The unit utilizes copper/aluminum winding conductors and is equipped with five high-voltage tap positions, providing voltage adjustment to accommodate varying system conditions.
Specifications
Model 00005A19CRLS
Year: 2013
S/N: 1359001878
Condition Used
Electrical
kVA 7500 kVA
Primary Voltage 13800 volts
Secondary Voltage 4160 volts
Phase 3-phase
General
Transformer Type Power Transformer
Auto VS Isolation Isolation
Oil vs Dry Oil
Other Specifications

Transformer Type: Liquid-Filled Power / Distribution Transformer

Rated Capacity: 7,500 / 9,975 kVA

Equivalent Capacity: 7.5 / 9.975 MVA

Cooling Class: ONAN / ONAF

Primary Voltage: 13,800Y / 7,970 V

Secondary Voltage: 4,160 V

Frequency: 60 Hz

Temperature Rise: 65°C

Impedance: 6.4% @ 85°C

Cooper Material Number: 00005A19CRLS

HV BIL: 95 kV

HV Neutral BIL: 95 kV

LV BIL: 60 kV

HV/LV Conductor: Copper / Aluminum

Core & Coil Weight: 7,377 kg

Tank & Fittings Weight: 4,203 kg

Fluid Weight: 3,760 kg

Total Weight: 15,340 kg (approx. 33,820 lb)

Insulating Fluid Volume: 4,209 L

Approx. Fluid Volume: 1,112 US gal.

Configuration: Isolation Transformer

Cooling: External radiator banks with forced-air fans

Standard: CSA C88-M90

PCB Content: Less than 1 PPM at time of manufacture


High-Voltage Tap Positions

  1. Tap A: 14,490 V - 397 A
  2. Tap B: 14,150 V - 407 A
  3. Tap C: 13,800 V - 417 A
  4. Tap D: 13,460 V - 428 A
  5. Tap E: 13,110 V - 439 A
  6. Low Voltage: 4,160 V
  7. Maximum LV Current: 1,384 A


Cooling System

The transformer is equipped with four Krenz-Vent forced-air cooling fans supporting its ONAF (Oil Natural Air Forced) cooling capacity.

  1. Cooling Fans: 4
  2. Fan Manufacturer: Krenz & Co. / Krenz-Vent
  3. Fan Model: F24-A10108
  4. Motor Manufacturer: Leeson Electric
  5. Motor Model: A4P11NZ45D
  6. Motor Part Number: A8269
  7. Motor Power: 1/6 HP
  8. Motor Voltage: 115 V
  9. Frequency: 60 Hz
  10. Phase: Single Phase
  11. Motor Speed: 1,140 / 850 RPM
  12. Full Load Amps: 2.9 / 1.6 A
  13. Duty: Air Over
  14. Insulation Class: F
  15. Frame: 48Y
  16. Maximum Ambient Temperature: 55°C

The four-fan forced-air cooling system increases heat dissipation through the radiator banks, allowing the transformer to operate at its higher 9,975 kVA ONAF rating, compared with its 7,500 kVA ONAN self-cooled rating.


Applications

This is a very useful industrial voltage combination. A 13.8 kV -> 4.16 kV transformer of this size is suited to large industrial and mining installations supplying 4.16 kV switchgear, MCCs, large motors, crushers, pumps, conveyors, compressors and process equipment.

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