What is an 11kV Distribution Transformer?
An 11kV distribution transformer is a type of power transformer that steps down 11kV medium voltage to low voltage (typically 400V/415V) for end-user consumption. It is the most common type of distribution transformer used in electrical power distribution networks worldwide.
Key Specifications of 11kV Distribution Transformers
Common Ratings
- 10kVA, 50kVA, 100kVA, 200kVA, 315kVA, 500kVA, 630kVA, 800kVA, 1000kVA, 1250kVA, 1600kVA, 2000kVA, 2500kVA
- Primary Voltage: 11kV (or 10kV in some regions)
- Secondary Voltage: 400V / 415V (3-phase, 4-wire)
- Frequency: 50Hz or 60Hz
- Phase: Three-phase
Types Available
Oil-Immersed Type: Most common, suitable for outdoor installation. Uses mineral oil or ester oil for cooling and insulation.
Dry Type (Cast Resin): Suitable for indoor installation. Epoxy resin encapsulated windings, no oil, environmentally friendly.
Applications of 11kV Distribution Transformers
- Commercial buildings and shopping malls
- Industrial plants and factories
- Residential complexes and housing societies
- Hospitals, schools, and universities
- Data centers and IT parks
- Renewable energy systems (solar/wind)
Factors to Consider When Buying 11kV Transformer
1. Power Rating (kVA)
Calculate your total connected load and add a safety margin of 20-30%. Undersized transformers lead to overheating and premature failure.
2. Oil vs Dry Type
Choose oil-immersed for outdoor installation and high power ratings. Choose dry type for indoor installation where safety and environmental concerns are important.
3. Efficiency Class
Modern transformers meet IE1, IE2, or IE3 efficiency standards. Higher efficiency transformers have lower no-load and load losses.
4. Certification
Look for ISO 9001, IEC 60076, CE, and other relevant certifications depending on your market.
11kV Transformer Price Range
The price of an 11kV distribution transformer varies based on capacity, type, and brand:
- 100kVA Oil-Type: $1,500 – $3,000
- 500kVA Oil-Type: $4,000 – $8,000
- 1000kVA Oil-Type: $7,000 – $15,000
- 1000kVA Dry-Type: $10,000 – $20,000
For accurate pricing and customized solutions, contact our team for a detailed quote.