Comprehensive technical data for 750 kVA dry transformers including dimensions, weight, full load amps, installation tips, and sizing guidance
Quick Specifications
| Rated Power: | 750 kVA | Phase: | Three-Phase |
| Primary Voltage: | 480V | Secondary Voltage: | 208Y/120V |
| Weight: | 2500 lbs (1134 kg) | Efficiency: | 99.2% |
| Dimensions (H×W×D): | 70″ × 40″ × 35″ (1778 × 1016 × 889 mm) | ||
A 750 kVA transformer is commonly used in Major power distribution. This guide provides complete specifications to help engineers and purchasers select and install 750 kVA transformers correctly.
750 kVA Transformer Dimensions
| Dimension | Metric (mm) | Imperial (inches) |
|---|---|---|
| Height (H) | 1778 mm | 70″ |
| Width (W) | 1016 mm | 40″ |
| Depth (D) | 889 mm | 35″ |
750 kVA Transformer Weight
| Weight Type | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| Dry-Type Transformer | 2500 lbs | 1134 kg |
| Oil-Filled Equivalent* | ~3750 lbs | ~1701 kg |
| Shipping Weight (Approx.) | ~2750 lbs | ~1247 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 750 kVA three-phase transformer:
| Voltage | Full Load Amps | Suggested Wire Size |
|---|---|---|
| 120V | 3608.5 A | 750 MCM+ |
| 208V | 2081.9 A | 750 MCM+ |
| 240V | 1804.3 A | 750 MCM+ |
| 277V | 1563.3 A | 750 MCM+ |
| 480V | 902.1 A | 750 MCM+ |
| 600V | 721.7 A | 750 MCM+ |
Three-Phase:
Amps = (kVA × 1000) ÷ (Voltage × 1.732)Example at 480V:
902.1 A = (750 × 1000) ÷ (480 × 1.732)Electrical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Rated kVA | 750 kVA | At rated voltage and frequency |
| Frequency | 60 Hz | 50 Hz available on request |
| No-Load Loss | 750 W | Core/iron losses (typical) |
| Load Loss | 3800 W | Copper losses at 100% load |
| Total Losses | 4550 W | At 100% load |
| Impedance | 5.75% | ±7.5% tolerance per IEEE |
| Efficiency | 99.2% | At 100% load |
| Sound Level | ~55 dB | Per NEMA ST-20 (estimated) |
⚠️ Important Considerations for 750 kVA Transformers:
- Large transformers like this 750 kVA unit generate significant heat. Verify room ventilation capacity before installation.
- Floor loading of 2500 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 750 kVA Three-Phase Transformer the Right Choice?
A 750 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 750 kVA
Example load distribution for a 750 kVA installation:
| Load Type | Estimated Demand |
|---|---|
| Large process motors | 225 kVA |
| HVAC central plant | 150 kVA |
| Building lighting | 75 kVA |
| Elevator systems | 75 kVA |
| Production equipment | 150 kVA |
| Auxiliary loads | 75 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 |
|---|---|
| 500 kVA Three-Phase | 500 kVA Specifications → |
| 750 kVA Three-Phase | Current Page |
| 1000 kVA Three-Phase | 1000 kVA Specifications → |
Frequently Asked Questions
What are the dimensions of a 750 kVA transformer?
A typical 750 kVA dry three-phase transformer measures approximately 70″ H × 40″ W × 35″ D (1778 × 1016 × 889 mm). Dimensions vary by manufacturer.
How much does a 750 kVA transformer weigh?
A 750 kVA dry transformer typically weighs around 2500 lbs (1134 kg). Oil-filled transformers of the same rating weigh approximately 3750 lbs.
What is the full load amperage of a 750 kVA transformer at 480V?
At 480V, a 750 kVA three-phase transformer has a full load current of 902.1 amps.
What loads can a 750 kVA transformer handle?
A 750 kVA transformer can supply up to 750 kVA of apparent power. For typical loads with 0.85 power factor, this equals approximately 637.5 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