Comprehensive technical data for 1000 kVA dry transformers including dimensions, weight, full load amps, installation tips, and sizing guidance
Quick Specifications
| Rated Power: | 1000 kVA | Phase: | Three-Phase |
| Primary Voltage: | 480V | Secondary Voltage: | 208Y/120V |
| Weight: | 3200 lbs (1451 kg) | Efficiency: | 99.2% |
| Dimensions (H×W×D): | 76″ × 44″ × 38″ (1930 × 1118 × 965 mm) | ||
A 1000 kVA transformer is commonly used in Utility substations. This guide provides complete specifications to help engineers and purchasers select and install 1000 kVA transformers correctly.
1000 kVA Transformer Dimensions
| Dimension | Metric (mm) | Imperial (inches) |
|---|---|---|
| Height (H) | 1930 mm | 76″ |
| Width (W) | 1118 mm | 44″ |
| Depth (D) | 965 mm | 38″ |
1000 kVA Transformer Weight
| Weight Type | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| Dry-Type Transformer | 3200 lbs | 1451 kg |
| Oil-Filled Equivalent* | ~4800 lbs | ~2176 kg |
| Shipping Weight (Approx.) | ~3520 lbs | ~1596 kg |
*Oil-filled transformer weight is estimated at approximately 1.5× dry-type weight.
Full Load Amps at Various Voltages
The following table shows calculated full load amperage for a 1000 kVA three-phase transformer:
| Voltage | Full Load Amps | Suggested Wire Size |
|---|---|---|
| 120V | 4811.4 A | 750 MCM+ |
| 208V | 2775.8 A | 750 MCM+ |
| 240V | 2405.7 A | 750 MCM+ |
| 277V | 2084.4 A | 750 MCM+ |
| 480V | 1202.8 A | 750 MCM+ |
| 600V | 962.3 A | 750 MCM+ |
Three-Phase:
Amps = (kVA × 1000) ÷ (Voltage × 1.732)Example at 480V:
1202.8 A = (1000 × 1000) ÷ (480 × 1.732)Electrical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Rated kVA | 1000 kVA | At rated voltage and frequency |
| Frequency | 60 Hz | 50 Hz available on request |
| No-Load Loss | 900 W | Core/iron losses (typical) |
| Load Loss | 4800 W | Copper losses at 100% load |
| Total Losses | 5700 W | At 100% load |
| Impedance | 5.75% | ±7.5% tolerance per IEEE |
| Efficiency | 99.2% | At 100% load |
| Sound Level | ~60 dB | Per NEMA ST-20 (estimated) |
⚠️ Important Considerations for 1000 kVA Transformers:
- Large transformers like this 1000 kVA unit generate significant heat. Verify room ventilation capacity before installation.
- Floor loading of 3200 lbs requires structural verification. Contact a structural engineer for slab-on-grade installations.
- Impedance matching is critical when paralleling transformers. Consult a power systems engineer.
- Arc flash hazard is significant at this capacity. Perform arc flash analysis and provide appropriate PPE.
When is a 1000 kVA Three-Phase Transformer the Right Choice?
A 1000 kVA three-phase transformer represents significant infrastructure:
- Large industrial plants and heavy manufacturing
- High-rise commercial buildings
- Utility substation distribution
- Data center primary power
- Campus-style power distribution
Infrastructure Requirements:
- Dedicated transformer pad or vault required
- Primary metering typically required at this capacity
- Coordination study with utility protection schemes essential
- Consider on-load tap changer (OLTC) for voltage regulation
Typical Load Examples for 1000 kVA
Example load distribution for a 1000 kVA installation:
| Load Type | Estimated Demand |
|---|---|
| Large process motors | 300 kVA |
| HVAC central plant | 200 kVA |
| Building lighting | 100 kVA |
| Elevator systems | 100 kVA |
| Production equipment | 200 kVA |
| Auxiliary loads | 100 kVA |
Note: Actual loads vary. Always perform a detailed load calculation for your specific application.
Related Transformer Sizes
Compare with adjacent kVA ratings:
| kVA Rating | Link |
|---|---|
| 750 kVA Three-Phase | 750 kVA Specifications → |
| 1000 kVA Three-Phase | Current Page |
| 1500 kVA Three-Phase | 1500 kVA Specifications → |
Frequently Asked Questions
What are the dimensions of a 1000 kVA transformer?
A typical 1000 kVA dry three-phase transformer measures approximately 76″ H × 44″ W × 38″ D (1930 × 1118 × 965 mm). Dimensions vary by manufacturer.
How much does a 1000 kVA transformer weigh?
A 1000 kVA dry transformer typically weighs around 3200 lbs (1451 kg). Oil-filled transformers of the same rating weigh approximately 4800 lbs.
What is the full load amperage of a 1000 kVA transformer at 480V?
At 480V, a 1000 kVA three-phase transformer has a full load current of 1202.8 amps.
What loads can a 1000 kVA transformer handle?
A 1000 kVA transformer can supply up to 1000 kVA of apparent power. For typical loads with 0.85 power factor, this equals approximately 850.0 kW of real power.
Related Resources
📊 Complete Reference Charts:
- Transformer Sizing Chart – Compare all kVA ratings with dimensions & weights
- Transformer Full Load Amps Chart – FLA reference for all voltages
Related Articles
- Three Phase Transformer: Complete Guide
- Transformer Testing: Complete Guide
- Transformer Protection: Complete Guide
Standards & References
- IEEE C57.12.01 – General Requirements for Dry-Type Transformers
- IEEE C57.12.91 – Test Code for Dry-Type Transformers
- NEMA TP-1 – Guide for Determining Energy Efficiency
- DOE 10 CFR 431 – Energy Conservation Standards
Disclaimer: Specifications shown are typical reference values compiled from multiple industry sources. Actual specifications vary significantly by manufacturer, model, enclosure type, and configuration. Always consult manufacturer datasheets for exact specifications before ordering or installation. Data accuracy verified using standard electrical engineering formulas. Last updated: January 2026