Overview

Our three-phase dry-type transformers are designed for applications where fire safety, environmental protection, and low maintenance are non-negotiable. Unlike oil-immersed transformers, dry-type units contain no flammable liquids, eliminating the risk of oil leaks, fires, and environmental contamination.

Available in two proven insulation technologies:

1. Oil-Free & Fireproof – No insulating oil means zero risk of fire or explosion. Self-extinguishing materials comply with fire safety standards (F1 per IEC 60076-11, or as specified).

Environmentally Friendly – No oil leaks to contaminate soil or water. No oil containment bunds or oil collection pits required. 100 % recyclable at end of life.

Maintenance-Free – No oil testing, filtration, or gasket replacement needed. Simply periodic visual inspection and cleaning.

Compact & Space-Saving – Smaller footprint than oil-immersed equivalents, especially with enclosed designs. Ideal for space-constrained indoor installations.

Low Losses – High-grade CRGO silicon steel core and optimized winding design minimize no-load and load losses, reducing lifetime operating costs.

Low Noise – Typically ≤ 50–60 dB depending on rating; suitable for installation near offices, hospitals, and residential areas.

High Short-Circuit Withstand – Mechanically robust windings designed to withstand short-circuit currents per IEC 60076-5.

Seismic Resistant – Low center of gravity and rigid construction; suitable for seismic zones (special design available).

Wide Voltage Range – Standard HV: 6.6 kV / 10 kV / 11 kV / 15 kV / 20 kV / 33 kV; LV: 380 V / 400 V / 415 V / 440 V / 480 V / 690 V. Custom ratios available.

IEC / ANSI / GB Standards – Designed, manufactured, and tested per IEC 60076-11, with optional compliance to ANSI/IEEE C57.12.01 or local standards.

Buildings & Infrastructure – High-rise offices, shopping malls, hotels, airports, metro stations

Healthcare & Education – Hospitals, clinics, universities, research laboratories

Data Centers & IT – Server rooms, telecom hubs, UPS systems

Industrial Plants – Food & beverage, pharmaceuticals, electronics manufacturing, automotive

Oil & Gas / Chemical – Hazardous areas where fire risk must be minimized

Mining & Tunneling – Underground operations where oil is prohibited

Marine & Offshore – Ships, platforms, ports (with special anti-corrosion treatment)

Renewable Energy – Solar farm step-down, wind farm collection, battery storage systems

Packing: Export-grade wooden crate or steel skid, moisture-proof wrapping, VCI anti-corrosion protection.

Transport: Suitable for 20 ft / 40 ft container depending on unit size.

Delivery Time: Typically 30 – 60 days after order confirmation and drawing approval (adjust to your actual lead time).

Incoterms: EXW / FOB / CIF / DDP – flexible terms available.

Documentation: Commercial invoice, packing list, Bill of Lading, Certificate of Origin, factory test report, CE / type test certificates.

Q1: What is the difference between Cast Resin and VPI dry-type transformers?

A: Cast Resin (CRT) transformers have windings fully encapsulated in epoxy resin, offering superior mechanical strength, moisture resistance, and suitability for harsh environments. VPI (Vacuum Pressure Impregnation) transformers use varnish-impregnated windings; they are generally more cost-effective for larger ratings and easier to repair. Both are oil-free and fire-resistant.

Q2: Can dry-type transformers be installed outdoors?

A: Standard dry-type units (IP00) are designed for indoor installation. For outdoor use, we provide IP23, IP44, or IP54 enclosures to protect against rain, dust, and debris. Please specify the installation environment when ordering.

Q3: What maintenance does a dry-type transformer require?

A: Dry-type transformers are essentially maintenance-free. Recommended periodic checks include:

Visual inspection for dust accumulation or physical damage

Cleaning ventilation ducts (every 1–2 years, depending on environment)

Checking temperature controller readings and connections

Verifying tightness of electrical connections

Q4: What is the expected lifespan of a dry-type transformer?

A: With proper installation, operation within rated parameters, and basic periodic inspection, dry-type transformers have a design life of 25 – 30+ years.

Q5: Can you manufacture a transformer with a non-standard voltage ratio?

A: Absolutely. We regularly produce custom units such as 13.8 kV → 480 V, 20 kV → 400 V, 33 kV → 415 V, or even 400 V → 220 V isolation transformers. Provide us with your required voltages, capacity, frequency, and vector group, and we will design a unit specifically for your project.

Q6: What tests are performed before shipment?

A: Every unit undergoes routine tests per IEC 60076-11, including:

Winding resistance measurement

Voltage ratio & vector group verification

Impedance voltage & load loss measurement

No-load loss & no-load current measurement

Insulation resistance & power factor (tan δ) test

Applied & induced voltage withstand test

Partial discharge measurement (for cast resin units)

Temperature rise test (type test, available on request)

Q7: How do I choose the right kVA size?

A: Add up the total kVA or kW of all loads to be supplied, apply a demand factor, and add a 20–30 % margin for future expansion. For motor-heavy loads, account for starting currents. Our engineers can assist with sizing calculations free of charge.

Q8: What is the warranty period?

A: (Insert your warranty terms, e.g., "24 months from the date of commissioning or 30 months from the date of shipment, whichever comes first, covering manufacturing defects.")

Q9: Do you provide installation guidance?

A: Yes. Each unit ships with a detailed Installation & Maintenance Manual. We also offer remote technical support via video call, and for large projects, on-site commissioning supervision can be arranged (subject to negotiation).

Q10: What is the minimum order quantity?

A: 1 unit. We welcome both single-unit orders and bulk project inquiries.