Unit/Package Substation Transformers

Unit/package substation transformers are oil immersed hermetically sealed type. Flexible corrugated tank walls enable sufficient cooling of the transformer and compensate for changes in the oil volume due to temperature variations during operation.

The windings are generally made up of copper. However, Aluminum windings can also be offered. All the standard designs have been proven by type testing including impulse, temperature rise, sound level and short circuit tests.

Substation transformers share the following features: 

• High integrity, compact design and aesthetic appearance.
• Portable.
• Weather and vermin proof.
• High security
• Economic and efficient to reduce operation cost.
• Safe, reliable and easy for operation.
• Sealed construction to prevent the entry of moisture.
• Low temperature rise and long service life.
• Low noise.
• Utec’s standard proven surface treatment.
• Robust construction for long time transportation under various conditions.
• Flexibility in designing transformers to meet customer requirements (Optimum cost)
• Competitive short delivery time.

Product Range:

• Rating up to 4.0 MVA (Three Phase)
• Primary voltage up to 36 kV
• Secondary voltages up to 1000V
• Frequency: 60Hz, 50Hz, 50/60Hz
• Vector group: Dyn11 (other vector groups can also be provided on request)
• Insulation: Class A
• Cooling: ONAN / KNAN
• Available fluids: mineral or silicon oil (Other fluids can also be filled on request)

Standard Accessories:

• HV Bushings
• LV Bushings
• Dial Type Oil Thermometer
• Pressure Relief Device
• Oil Level Indicator
• Off-circuit Tapselector
• Oil Drain Valve
• Earthing Terminals
• Lifting Lugs

Optional Accessories (If required):

• Dial Type Oil Thermometer With Two Contacts
• Pressure Relief Device With Two Contacts
• Oil Level Indicator With Two Contacts
• Thermometer Pocket
• Filter Valve
• DMCR Protection Relay (DGPT2)