100 kVA 11kV to 400V Transformer Price and Specifications
A 100 kVA 11kV/400V transformer is a critical component in electrical distribution systems, widely used in industrial plants, commercial facilities, rural electrification, and utility substations. It steps down medium voltage (11,000 volts) to a usable low voltage (400 volts) for distribution to equipment, buildings, and loads.
What Is a 100 kVA 11kV/400V Transformer?
This transformer type is designed to convert 11 kilovolts (kV) on the primary side to 400 volts on the secondary. The power rating of 100 kVA (kilovolt-amperes) defines its capacity to handle electrical load without overheating or performance issues. Depending on its design, this transformer can be oil-immersed or dry-type.
Price of 100 kVA 11kV to 400V Transformer
The price of a 100 kVA 11kV/400V transformer typically ranges between $1,200 to $2,500 USD, depending on:
- Type: Oil-immersed vs. dry-type
- Insulation level and efficiency rating
- Core material (copper vs. aluminum winding)
- Standards compliance (IEC, ANSI, BIS)
- Accessories (tap changers, enclosures, surge arresters)
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Approximate price breakdown:
| Type | Price Range (USD) |
|---|---|
| Oil-Immersed | $1,200 – $1,800 |
| Dry-Type Resin | $1,600 – $2,500 |
| With Accessories | Up to $3,000 |
Bulk orders, custom specs, and shipping destination can significantly affect the final quote.
Technical Specifications
| Parameter | Value |
|---|---|
| Rated Power | 100 kVA |
| Primary Voltage | 11,000 V |
| Secondary Voltage | 400 V |
| Frequency | 50/60 Hz |
| Phase | 3-Phase |
| Vector Group | Dyn11 (typical) |
| Insulation Class | A/B/F depending on type |
| Cooling Type | ONAN (Oil Natural Air Natural) or AN (Air Natural) |
| Winding Material | Copper / Aluminum (optional) |
| Tapping Range | ±2.5% or ±5% (Optional) |
| Protection | IP00/IP23 Enclosure |
| Standard Compliance | IEC 60076 / IS / ANSI |
Applications of 100 kVA Transformer
This transformer rating is ideal for:
- Rural electrification
- Industrial workshops
- Commercial complexes
- Micro-grid and solar inverter systems
- Data centers & telecom base stations
How to Choose the Right 100 kVA 11kV/400V Transformer
- Confirm the voltage compatibility with your incoming line (11kV)
- Choose copper winding for better conductivity, aluminum for lower cost
- For indoor use, go for dry-type; for outdoor, oil-immersed is more rugged
- Ensure the cooling and protection class matches your ambient conditions
- Look for BIS/IEC/ANSI compliance based on your region
Frequently Asked Questions (FAQ)
Q1: What is the typical lifespan of a 100 kVA transformer?
A: Around 25-30 years with proper maintenance and environmental conditions.
Q2: Is copper or aluminum better for transformer windings?
A: Copper has better conductivity and durability, but aluminum is more cost-effective.
Q3: Can I install a 100 kVA transformer indoors?
A: Yes, a dry-type transformer is designed for indoor use with fire-retardant properties.
