Comprehensive technical data for 100 kVA dry transformers including dimensions, weight, full load amps, installation tips, and sizing guidance
Quick Specifications
| Rated Power: | 100 kVA | Phase: | Single-Phase |
| Primary Voltage: | 480V | Secondary Voltage: | 120/240V |
| Weight: | 650 lbs (295 kg) | Efficiency: | 98.9% |
| Dimensions (H×W×D): | 50″ × 28″ × 22″ (1270 × 711 × 559 mm) | ||
A 100 kVA transformer is commonly used in Heavy industrial, utility substations. This guide provides complete specifications to help engineers and purchasers select and install 100 kVA transformers correctly.
100 kVA Transformer Dimensions
| Dimension | Metric (mm) | Imperial (inches) |
|---|---|---|
| Height (H) | 1270 mm | 50″ |
| Width (W) | 711 mm | 28″ |
| Depth (D) | 559 mm | 22″ |
100 kVA Transformer Weight
| Weight Type | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| Dry-Type Transformer | 650 lbs | 295 kg |
| Oil-Filled Equivalent* | ~975 lbs | ~442 kg |
| Shipping Weight (Approx.) | ~715 lbs | ~324 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 100 kVA single-phase transformer:
| Voltage | Full Load Amps | Suggested Wire Size |
|---|---|---|
| 120V | 833.3 A | 750 MCM+ |
| 208V | 480.8 A | 750 MCM+ |
| 240V | 416.7 A | 750 MCM+ |
| 277V | 361.0 A | 500 MCM |
| 480V | 208.3 A | 250 MCM |
| 600V | 166.7 A | 3/0 AWG |
Single-Phase:
Amps = (kVA × 1000) ÷ VoltageExample at 480V:
208.3 A = (100 × 1000) ÷ 480Electrical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Rated kVA | 100 kVA | At rated voltage and frequency |
| Frequency | 60 Hz | 50 Hz available on request |
| No-Load Loss | 180 W | Core/iron losses (typical) |
| Load Loss | 750 W | Copper losses at 100% load |
| Total Losses | 930 W | At 100% load |
| Impedance | 4.5% | ±7.5% tolerance per IEEE |
| Efficiency | 98.9% | At 100% load |
| Sound Level | ~42 dB | Per NEMA ST-20 (estimated) |
⚠️ Important Considerations for 100 kVA Transformers:
- Large transformers like this 100 kVA unit generate significant heat. Verify room ventilation capacity before installation.
- Floor loading of 650 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.
When is a 100 kVA Transformer the Right Choice?
A 100 kVA single-phase transformer is designed for substantial loads:
- Large commercial facilities (10,000+ sq ft)
- Industrial workshops with heavy machinery
- Data center backup power systems
- Large agricultural operations
- Mining and extraction equipment
Engineering Considerations:
- Voltage drop calculations become critical at this size
- Short circuit current analysis required
- Consider redundant transformer configuration for critical loads
- Coordinate overcurrent protection with utility requirements
Typical Load Examples for 100 kVA
Example load distribution for a 100 kVA installation:
| Load Type | Estimated Demand |
|---|---|
| Industrial HVAC | 25 kVA |
| Production equipment | 35 kVA |
| Facility lighting | 15 kVA |
| Compressed air system | 15 kVA |
| Office/admin loads | 10 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 |
|---|---|
| 75 kVA Single-Phase | 75 kVA Specifications → |
| 100 kVA Single-Phase | Current Page |
| 167 kVA Single-Phase | 167 kVA Specifications → |
Frequently Asked Questions
What are the dimensions of a 100 kVA transformer?
A typical 100 kVA dry single-phase transformer measures approximately 50″ H × 28″ W × 22″ D (1270 × 711 × 559 mm). Dimensions vary by manufacturer.
How much does a 100 kVA transformer weigh?
A 100 kVA dry transformer typically weighs around 650 lbs (295 kg). Oil-filled transformers of the same rating weigh approximately 975 lbs.
What is the full load amperage of a 100 kVA transformer at 480V?
At 480V, a 100 kVA single-phase transformer has a full load current of 208.3 amps.
What loads can a 100 kVA transformer handle?
A 100 kVA transformer can supply up to 100 kVA of apparent power. For typical loads with 0.85 power factor, this equals approximately 85.0 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