Dry Type Auto Transformer
GE Transformer autotransformers deliver high-efficiency, cost-effective voltage step-up or step-down conversion by sharing a common winding. They are the ideal space-saving solution for industrial applications where precise voltage adjustment is critical, but electrical isolation is not required.
Space & Cost Saving: Up to 40% smaller, lighter, and more economical than standard two-winding isolation transformers. Perfect for tight electrical enclosures.
Premium Efficiency: Built with high-grade CRGO silicon steel cores and precision-wound conductors (copper or aluminum) to minimize energy loss.
Heavy-Duty Reliability: Advanced Class F (155°C) or Class H (180°C) VPI insulation ensures stable continuous operation under heavy industrial loads.
Versatile Applications: CE/UL/ISO compliant. Ideal for motor starting, CNC machinery, and voltage correction. Available in standard or custom configurations (IP00/IP20/IP23).
Dry Type Auto Transformer
Tailored to Your Exact Specifications
Core Specifications & Performance Customization
Capacity Range: Broad manufacturing capability from Single Phase (3kVA – 500kVA) to Three Phase (5kVA – 3000kVA+).
Custom Voltages & Taps: Tailored primary and secondary voltages with customized tap configurations (e.g., ±2.5%, ±5%) for precise local grid matching.
Winding & Insulation: Choice of premium copper or high-grade electrolytic aluminum. Insulation available in Class F or Class H to match specific thermal requirements.
Power Quality Design:** K-Factor ratings (K-4, K-9, K-13, K-20) for handling non-linear load harmonics and Electrostatic Shielding to eliminate common-mode noise.
Integrated Power Control & Safety
Switchgear Integration: Pre-installed primary/secondary circuit breakers, AC contactors, and fuses for immediate plug-and-play installation.
Advanced Protection: Integrated Surge Protection Devices (SPD) / TVSS to eliminate voltage transients and output leakage protection to ensure operator safety.
Neutral Configurations: Neutral is safely brought out to terminal blocks for versatile grounding and load distribution.
Thermal Management Systems
Temperature Monitoring & Control: Analog/digital thermometers and integrated thermostats with NO/NC contacts for automated alarm and trip control.
Climate Adaptation: Anti-condensation strip space heaters to prevent moisture buildup in high-humidity or outdoor environments.
Cooling Systems: Automated forced-air (AF) cooling fans to safely handle continuous heavy-duty load conditions.
Enclosure & Mechanical Options
Custom Protection Ratings: Heavy-duty enclosures available from IP20 (Indoor) up to IP65 / NEMA 4X (Harsh Outdoor Environments).
Premium Materials & Finish: Choose between durable cold-rolled steel or premium 304 / 316L stainless steel (ideal for corrosive/marine use). Customizable exact RAL color matching.
Mobility & Installation: Optional heavy-duty caster wheels for easy relocation on the shop floor and external anti-vibration pads to minimize acoustic noise.
Dry Type Auto Transformer Specifications
| Capacity | Single Phase: 3 to 500kVA Three Phase: 5 to 3000kVA |
| Primary Voltage | 800V, 690V, 660V, 600V, 480V, 440V, 415V, 380V, 240V (Customizable) |
| Secondary Voltage | 800V, 660V, 600V, 480V, 440V, 415V, 380V, 240V, 120V, 110V (Customizable) |
| Winding Material | Copper or aluminum |
| Frequency | 60Hz (50/60Hz Optional) |
| Connection Type | YNyn0 (Autotransformer, 0° phase displacement) or others |
| Temperature Rise | ≤115° Other temperature rise options are customizable |
| Insulation | Class F (155°C) or Class H (180°C) VPI Impregnated |
| Cooling Method | AN (Air Natural) / AF (Air Forced with optional smart fans) |
| Efficiency (%) | ≥98% |
| Noise level (dB) | ≤45db |
| Voltage drop | <3% |
| Enclosure Type | Protection rating up to IP65; colors and materials are customizable |
| Optional Accessories | Circuit breaker, AC contactor, Thermostat, Output leakage protection, Fuse, Inverter or others |
| Warranty | Typically one year, depending on the client’s specific needs |
| Certifications | IEC, CE, UL, CSA, IEEE C57.110 |
| Minimum Order Quantity | ≥1 set |
| Packaging Details | International standard wooden crate or as per actual shipping requirements |
| Delivery Time | Generally 5-10 days, depending on order quantity |
Dry Type Auto Transformer application
Motor Starting Systems (RVAT)
Application: Widely integrated into Reduced Voltage Auto-Transformer (RVAT) starters.
The GE Advantage: Safely limits massive inrush currents and reduces mechanical stress on large industrial AC motors, heavy-duty pumps, and ventilation fans during the startup phase.
CNC Machinery & Industrial Automation
Application: Voltage matching for imported or exported industrial equipment.
The GE Advantage: Provides precise voltage step-up or step-down (e.g., adapting a 380V/480V facility grid to 220V machinery) for CNC routers, robotics, and automated production lines, ensuring stable and error-free operation.
HVAC & Commercial Refrigeration
Application: Power supply adjustment for heavy commercial climate control systems.
The GE Advantage: Delivers highly efficient, continuous power to heavy-duty water chillers, industrial compressors, and large-scale commercial HVAC systems without overheating.
Facility Power & Lighting Distribution
Application: Localized voltage adjustment within factory floors or commercial complexes.
The GE Advantage: A cost-effective, space-saving solution for stepping down utility voltage for specific manufacturing zones, test rigs, or extensive commercial lighting circuits.
Why Choose GE Transformer
Quality Control: Quality is a core value of GE Transformer. We conduct Factory Acceptance Testing (FAT), type testing, and third-party inspections to ensure superior quality. We strictly adhere to the ISO 9001 quality management system, committed to providing our customers with the highest quality products.
Professional Team: Our team comprises highly skilled professionals dedicated to responding quickly to customer needs. All GE Transformer team members receive systematic training and continuously improve their capabilities through rigorous quality standards and practices. Our commitment to customer service, product innovation, engineering excellence, and social and environmental responsibility makes us a trusted partner in the global power industry.
Certifications
- ISO9001：2015
- CE Certifications:
- UL Certifications:
- CSA Certification:
- CNAS Certification:
Competitive Market Pricing:Leveraging years of industry experience, GE Transformer integrates high-quality resources across R&D, production, procurement, transportation, and service, achieving effective cost control.
Fast Delivery: Strong production capacity, multiple freight partners, and a professional pre-sales and after-sales team, adhering to the “customer first” philosophy, provide customers with fast delivery and usage services.
FAQ
Q1: What is the main difference between an autotransformer and an isolation transformer?
A: The primary difference lies in the winding configuration. An isolation transformer has separate primary and secondary windings, providing complete electrical isolation between the input and output. An autotransformer utilizes a single continuous winding shared by both sides. This shared-winding design makes autotransformers significantly more compact, lightweight, and cost-effective, though they do not provide electrical isolation.
Q2: Can GE Transformer customize voltage ratios for non-standard regional grids?
A: Yes, absolutely. As a dedicated B2B manufacturer, we specialize in fully customized voltage configurations. We can design primary and secondary voltages to match any local utility grid or industrial equipment requirement worldwide (e.g., 600V, 480V, 415V, 380V, 240V, 220V) including multi-tap configurations (e.g., ±2.5%, ±5%) for precise field adjustments.
Q3: Which winding material is better for an autotransformer: Copper or Aluminum?
A: Both materials offer distinct advantages depending on your project priorities. Copper (Cu) windings provide higher electrical conductivity, resulting in lower load losses, a smaller footprint, and maximum thermal efficiency. Aluminum (Al) windings are highly cost-effective and lighter in weight, offering excellent reliability for budget-conscious OEM projects while meeting all standard performance criteria.
Q4: Why are dry-type autotransformers ideal for reduced-voltage motor starting?
A: Autotransformers are highly effective in Reduced Voltage Auto-Transformer (RVAT) starters because they can step down the voltage during the motor’s startup phase. This drastically limits the massive inrush current drawn from the grid and reduces mechanical shock on heavy industrial equipment like pumps and compressors, ensuring a smooth and safe startup sequence.
Q5: Can your autotransformers handle current harmonics caused by non-linear loads?
A: Yes. Standard autotransformers can overheat if subjected to high levels of harmonics from non-linear loads like VFDs, CNC machinery, or LED lighting power supplies. GE Transformer can specifically engineer your unit with K-Factor ratings (such as K-4, K-13, or K-20), utilizing specialized core and geometric winding designs to safely handle harmonic distortions without derating or overheating.
Q6: What is the typical lead time for a custom-engineered GE autotransformer?
A: Lead times vary depending on the capacity (kVA) and custom complexity. Standard catalog configurations typically ship within 1 to 2 weeks. For fully customized or complex OEM/ODM designs requiring non-standard specifications, multi-taps, or integrated switchgear, our typical lead time ranges from 3 to 4 weeks from final drawing approval. Emergency rush production is available for critical project timelines.